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mgf9op | Why is 0,99999... equal to 1? | Mathematics | explainlikeimfive | [
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"Fastest mathematical proof: x = 0.99999999... 10x = 9.9999999999... 10x - x = 9.99999999... - 0.99999999... 9x = 9 x = 1"
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115
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eqyr9w | What’s The purpose of seven layers of skin when it’s so easy to rip through all 7 with just a small cut? | Biology | explainlikeimfive | [
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"Skin doesn't just exist to protect us from blades, which would be silly anyway since skin evolved loooooooong before blades were invented. Skin protects the organism from all kinds of invaders, like bacteria and viruses and parasites. It provides a form of waterproofing so that our squishy inside parts don't dissolve or wash away. It keeps out dirt, fecal matter, all kinds of contaminants that would destroy soft organs and tissues. It provides protection from predators, insects, etc etc etc. In some species, skin also helps animals survive by developing certain patterns that help the animal blend in with its environment, so it's harder for predators to see. In certain cephalopod species, we see skin with little organs embedded within it, called chromatophores, which create rapidly shifting patterns and colors that not only help the animal hide, they also allow the animal to communicate with others of its species. Skin also protects soft internal parts and cells from dangerous radiation. A classic example is the melanin in human skin, which protects cells from damage in parts of the world where it's very sunny much of the time. Skin can do all kinds of awesome things. In the Thorny Dragon, for example, the patterns of lumps and ridges on its skin use a wicking action to draw water up from the ground and toward the lizard's mouth, so instead of having to find pools and bend down to drink, the lizard can just stand in a little puddle and its skin will bring the water to its mouth. Some skin functions as a kind of hardcore armor. In the pangolin, the skin grows overlapping scales made of keratin (the same substance our hair and nails are made from), in animals like alligators the skin has scutes (bony plates) within its layers, that make the skin into a super-hard protective layer. Skin can also serve as a form of air conditioning in some species, using sweat glands to produce moisture on the surface of the skin, which then evaporates, which helps cool the body down. So even though skin can be harmed, broken, and damaged, in the grand scheme of things it's an amazing and essential organ that has played a huge part in the survival of life on this planet."
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9ru5gv | how do electron guns in tvs work? | Won't it just become a lightining gun? | Technology | explainlikeimfive | [
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"In older cathode ray tube (CRT) screens there is an electron gun and a phosphor screen inside a vacuum tube. The simplest electron gun is the hot cathode type, which is essentially a filament (usually tungsten) that current is passed through (like a light bulb). When the filament gets hot enough, electrons gain enough thermal energy to escape the filament in a process known as thermionic emission. Tungsten has a high melting point and is relatively cheap so it is the most common filament material. Once the electrons are free, they are swept through the vacuum tube by an electric field towards the phosphor screen (attracted by a positive voltage). The tube need to be evacuated so that electrons do not collide with gas molecules before reaching the phosphor screen, and also the tungsten does not oxidize and burn out (like when you break a light bulb). The electrons strike a phosphor screen and in doing so excite electrons bound to the phosphor material. When the excited electrons relax, the excess energy that they received by being bombarded with the free electrons gets released as a photon, which you see as the picture."
] | [
3
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hoh402 | How can a bug be flicked across the room and not take fall damage? | Biology | explainlikeimfive | [
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"If you mean why is it fine flying/ falling a distance 50x it's height and be fine, compared to humans? It boils down to the Square-Cube Law: If something gets 10 times bigger, it will become 1000 times (10^(3)) heavier, because height, weight, and length all increase by 10. This means that things that work in a small scale don't work scaled up: compare ants to elephants. Ants have super thin legs, even compared to their own bodies, and can lift 6x their weight! Elephants, on the other hand, need to have huge tree trucks for legs and can't carry nearly as much. This allows insects to withstand comparative forces much higher than other, larger creatures In addition, because these insects have this small weight to size ratio, their air resistance prevents their maximum velocity from being very fast, similar to trying to throw a feather as hard as possible. This also limits how hurt insects can get. A way to remember this is a story I heard a story a long time ago: If you drop different creatures down a well, a mouse won't notice, a cat will be stunned, a dog will limp away, a human will break, and a horse will splat."
] | [
450
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5zlns3 | Why is it so easy to gain weight but so hard to lose it? | Biology | explainlikeimfive | [
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"dez556n",
"dez2lrv"
] | [
"It's not hard to lose weight really. It's just not fun. You gain weight by eating more calories than you use in a day and everybody loves eating. Especially since high calorie foods tend to be especially tasty. People don't like burning more calories than they take in because it basically means effort, hunger or both."
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13
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lp3v1n | Why are all the water pipes burst in Texas? Did they use cheaper pipes or what is the difference between those which are used in colder regions and not burst? | Engineering | explainlikeimfive | [
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"Insulation is the big difference. In cold climates, people uses a lot of insulation to keep the cold out, same pipes, but protected from freezing due to insulation."
] | [
41
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akyvki | How can we freeze molecules to almost absolute 0? | It makes sense to heat things up you give them energy in various forms but I wanted to know how to freeze things to such low temperature. | Technology | explainlikeimfive | [
"ef96mnb"
] | [
"When you decrease the pressure of a gas, it will cool down. If you compress it, it'll heat up. So you can first compress a gas to a really high pressure, let it cool down, and then expand again - and it'll be really cold. Then you compress some of the cold gas again, and cool that down with the remaining cold gas to reach an even lower temperature. Rinse and repeat, until you have a tiny amount of liquid gas very close to 0K. That's the easy part. To get very close to 0K, they use laser cooling: When atoms absorb a photon, they receive a bit of impulse, that means they are pushed a bit into a random direction. Normally that heats them up. But by using a few clever tricks with a laser, they can make the atoms only absorb photons when they are moving in the opposite direction of the photons. Each time this happens, the atoms lose a bit of their heat energy. This way, they can be cooled to around 0.001 Kelvin or even less."
] | [
6
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i788fo | Why are digital displays, car tachometer or aircrafts cockpit backlights often green? | I noticed, that especially older japanese cars had tachometers with green lights. Aircrafts like the C17 or Ilyushins also have green cockpit lights. Are there any benefits or some special reasons for using that colour? Maybe like easier to read? For example the cockpit colours of Soviet aircraft were turquoise, because it was confirmed that this colour is affecting the pilots psychologically positive. | Engineering | explainlikeimfive | [
"g10cony",
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"It is easier on the eyes, and is less likely to cause eye fatigue. There is a reason why most current phones have blue light filters."
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4
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glr77b | In racing events why do some cars start at the starting line and others start at the end? | I always see it in nascar but I recently saw it in some RC races. I always felt that it would be more fair if everyone started at the starting line at the same time. | Other | explainlikeimfive | [
"fqz9pjy",
"fr09jt8"
] | [
"Before the race, each racer goes through a time trial where they're timed doing a lap of the track by themselves. The faster you complete a lap, the closer you get to the starting line for the actual race."
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10
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8ez1vf | How does an operating system for the visually impaired look? How does it work? | Technology | explainlikeimfive | [
"dxz90yh"
] | [
"While I would love to explain it to you; The YouTuber, Tommy Edison, explains it perfectly. He is actually blind and He describes how he does it. You can watch the video [here]( URL_0 )"
] | [
3
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7dwgon | do babies really need to drink warm milk or is it more like a society myth? | Biology | explainlikeimfive | [
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"Well, babies tend to stick with drinking what they know. Usually, it's that sweet, warm milk from mommy's boobs. So they prefer warm drinks over cold ones. When older, and able to drink cow milk, they might as well drink cold milk, but they might stick to warm just because it's what they know. When babies are fed formula, the water to mix with the powder has to be warm to dissolve it. Plus, that shit gets nasty when cold Source: am a dad, at this moment bottlefeeding my one year old his warm night bottle of formula."
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31
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m04nln | If a company or website gets hacked, why does it matter how strong my password is? Isn’t it more important that I don’t re-use a password? | If a site gets hacked, am I at any sort of advantage by having a complicated password, or does it not really matter at that point? | Technology | explainlikeimfive | [
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"Any company worth its salt will store your password in a form called a hash. This is you password scrambled up and reduced in size with math, so it’s near impossible to get your original password back. The standard practice for hackers once they get the hash is to do the same math at all sorts of different passwords to see if your hash comes out. This is the reason you have complicated passwords. More possible different passwords make this so much more difficult. So once they plug the hole in their security, the hackers won’t be able to just log in using your password. They wouldn’t have figured it out."
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41
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76zoh9 | Why is closing a crashed game on PC so difficult? | Technology | explainlikeimfive | [
"dohuzxj",
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"Because you're telling the OS \"send this game a message telling it to shut down.\" If the game is responsive that's not a problem, the game hears the message and turns itself off. If the game crashed or in any other way is unresponsive you're talking to deaf ears. The game can't hear the message and can't turn itself off, it cannot respond to anything the OS is telling it to do. At this point the OS must kill the process (usually via the task manager) by depriving it of its resources and forcefully killing off the game."
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27
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8m2z8q | Does the idea of numbers being 'bigger' than other numbers hold for complex numbers? | When we are dealing with the real number line, numbers that are more to the right than others will be considered bigger. But does this or any other method hold true in the complex plane? Edit: A lot of people are talking about the magnitude, but, -5 < 0, Mod -5 > 0. | Mathematics | explainlikeimfive | [
"dzkk4o6",
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"In short, no. Complex numbers do not form what we call an \"[ordered field]( URL_0 )\", because they break the properties you'd need to establish an order. People are mentioning the absolute value, but that's something else entirely, with different properties."
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7cbxl7 | Why are most animals seemingly unaffected by / unafraid of the presence of most other animals but immediately flee at the sight of a human | An example of what I mean would be why birds and squirrels or a deer and a hawk or a dolphin and a sea turtle coexist within close range unphased by each others company, but flee when they see a human. | Biology | explainlikeimfive | [
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"Eyeballs. Predetors usually have their eyeballs on the front of their heads (think human, wolf, lion) where prey have their eyeballs on the side of their heads (think deer, rabbit, mouse). It's like a big red flag for animals."
] | [
2198
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951ayz | Can you explain to me the order of mathematics to be learned from low level to university level? And why is the order in such way? | Mathematics | explainlikeimfive | [
"e3p8b4a",
"e3p8msq"
] | [
"Here's how I learned math/would have learned math if I pursued a math degree in college. Addition - you can learn this using fingers Subtraction - it's the opposite of above Multiplication - This is really just lots of addition Division - this is the opposite of above Algebra - this teaches problem solving for an unknown variable Geometry - requires Algebra to solve equations, also teaches \"proofs\" which are a critical thinking skill that makes you go from point A to point B using math and logic. Harder Algebra/Triginometry - Having learned logic and going from point A to point B is helpful in more difficult algebra equations Pre-Calculus - some precursor calculus stuff Calculus - requires pre-calculus *Statistics - school ran out of more difficult math so \"regressed\" to an easier class of stats, this could be taught after harder algebra *Even Harder Calculus - This is pretty esoteric and not needed for most people, it's just more calculus *Linear Algebra - this is matrix math, it's pretty difficult and is basically how Google runs their search engine *Differential Equations - This is even harder math, requires most previous skills *Even more harder calculus - even harder math Really math is very logically laid out. Every class put in there builds off the previous one, which is why kids who fall off the wagon early have a hard time getting back on. Edit: noticed your exact question, anything with an asterisk you probably won't need for low level university."
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18
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5mbhgi | Why does hot water feel significantly hotter on my face than on other parts of my body? | Other | explainlikeimfive | [
"dc2bchl"
] | [
"A more sensitive and dense pattern of nerves and minute vascularisation in your face. Your back/thigh/arm doesn't have the same amount or type of nerves as your face. Your head is highly vascular as well, and is the warmest appendage from the core. You regulate your skull temperature quicker to keep your brain in its happy stasis. Feeling hotter heat on your face is a sensory warning to protect your noggin."
] | [
11
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drf66d | why are silent letters kept in the word's spelling? Why can't it be just Jango in place of Django? | Culture | explainlikeimfive | [
"f6hogtl",
"f6imm1g"
] | [
"I pronounce those two different, but that might be just me. When I pronounce Dj my tongue is more to the front of my mouth."
] | [
11
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6i6vnt | Why do the people around you always look the same to you, while you can look totally different to yourself even over the course of a few hours? | Culture | explainlikeimfive | [
"dj4dikk",
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"dj4aifk",
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"Basically, because we are only aware of our own stimuli. If I step out of my office to grab lunch, I might walk in the sun and feel a little sweaty, I might get caught in the wind and feel a little mussed, I might eat a big greasy lunch and then feel gross about it. Because I FEEL windswept and uncomfortably full, if I look in the mirror, that will be reflected. I'll think I'm fatter, I'll be frustrated that my hair isn't cooperating, or embarrassed that I'm hot and sweaty. But the truth is, no one else in my office knows that I was in the wind or I ate too many fries. As far as they're concerned, I walked out and then walked back in a little later, as people do in offices. They didn't experience any of the external factors that are currently making me feel different than I did an hour ago. The woman who sits at the desk across from me just cam back from the bathroom. She might have started her period and be totally uncomfortable and in pain. She might have read an email while sitting there and gotten some great news. She might have suddenly realized she wore different shoes than she meant to and her outfit is way off. Her entire state of mind could have totally shifted while she was gone, but I'd have no fucking idea."
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aqoizv | What is drop shipping and how do people make money doing it? | Economics | explainlikeimfive | [
"eghfrmr",
"eghgmnx"
] | [
"So, you order from my company because we distribute warehouse supplies - boxes, packing tape, whatever. As a buyer, you trust me, because I've always given you quality service and product. You decide that you want a large piece of machinery like a straddle stacker (a type of fork truck used to get loads higher up in small warehouses). Now, it's very difficult for me to store and ship a piece of machinery like that - it's big, it's bulky, and it's something I'm not likely to sell a lot of. But I want to be able to sell it, because my customers (like you!) want it. So I strike up a deal with a straddle stacker manufacturer - they'll provide me a discounted price on the item compared to what I sell it for, and I'll send all of my orders for that item to them rather than a competitor. My customer gets what they want (a product they need), I don't spend the warehouse space to do it, and still get a cut, and the manufacturer gets more business through my storefront. They \"drop ship\" the item - you ordered from me, but they're the ones sending the order to you at my request. So rather than the order coming from /u/aerim Distribution, it comes from the manufacturer directly."
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8wgn52 | Why are some days hotter than others? | Other | explainlikeimfive | [
"e1vgrum"
] | [
"The planet's weather is guided by air and water currents. Day to day changes in temperature are caused primarily by the air currents, such as the Jet Stream in North America.This current of air which runs from West to East across the continent brings in low pressure systems (storm systems) that originated over the Pacific ocean. As well as moves high pressure (dry weather) ridges over the country. Most commonly, low pressure systems dip from NW to SE in the US, and with them, they bring a line of unstable air and most times, precipitation.The air behind it being a high pressure ridge. This, also known as a cold front, spinning clockwise, changes the wind direction from a Southerly component to a Northern one. In North America, this means cool, Northern air penetrating through your region. After a cold front passes, and the high pressure ridge builds in, the wind direction changes back over the course of 1-3 days to having a Southerly component, bringing in warmer air from the South. This process is repeated throughout the course of the year. In tropical areas of the country such as South Florida, these cold fronts typically fall apart before getting there.Which is why areas like that see very little change in temperature from day to day. It's also important to note that although water currents have a profound impact on weather, it's not typically associated with day to day forecasting. Edit: Formatting"
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hdmqan | Does the electronic devices consume notable amount of electricity while on standby? | I've always had this doubt. For instance, while we're leaving a television switched off (via remote) and the main device is on standby (power light still lit up) will it continuously consume electricity? Or does it hold with the initial electricity it consumes while it's turned on? And also, I've connected all of my Pc peripherals along with the TV & router on a main port. So while I'm using only the WiFi, the TV & speakers were on stand-by everyday does it increase the power consumption?? | Technology | explainlikeimfive | [
"fvm39bc",
"fvm5gno"
] | [
"Yeah standby mode uses some power. It's vanishingly small compared to active mode though. I'd be surprised if it amounted to more than 3-5$ per year for all your devices combined."
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10
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cv9wkr | Why do tastebuds seem to change when you’re sick? | I’ve got some kind of sinus infection or cold (I work at a middle school, lol) and now my cinnamon roll coffee creamer tastes HORRIBLE. Why? | Biology | explainlikeimfive | [
"ey2shld",
"ey2sh9w",
"ey355mq",
"ey2xn1n",
"ey37wnf"
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"For humans, a large part of taste is actually related to smell. Sinus issues affect the way we smell, hence taste."
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8
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d9xmug | How do the volume become louder when you turn the volume up? How does it work in corcuit board? | Technology | explainlikeimfive | [
"f1lxug8",
"f1lxyqz"
] | [
"In a traditional analog circuit, volume is normally controlled by a variable resistor. When you turn the volume up, you are reducing the resistance to the flow of the electrical signal. It is the same as turning the knob on a water faucet to increase the flow of water."
] | [
7
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jh1xza | How the fuck have sharks been able to survive five mass extinctions, hundreds of species coming and going, and 450 million years of Earth's development, and yet are nearing extinction? | Biology | explainlikeimfive | [
"g9uj3ku",
"g9uihwx",
"g9uhipe"
] | [
"Because as a living, evolving mass extinction event, humans are really fucking good at killing things. Also, bear in mind that this is true for literally all species. Every single species that goes extinct has survived up to that point since the dawn of life. T-Rex for example had a continuous, unbroken genetic line for about 3.5 billion years, surviving countless mass extinctions, before losing to a meteorite. To survive a mass extinction, a species only needs a very small number of individuals to survive, and as long as you have a critical mass for reproduction and genetic diversity, you'll just evolve into a bunch of new species after that event. A key advantage sharks have is diversity. There are a *lot* of shark species, which means any given extinction event is going to have a very hard time wiping them all out. If just a few species survive, then after the mass extinction, sharks still exist. Each time, most species will probably go extinct, but some survive. Humans are a faster and more dangerous mass extinction event than any seen before, but there are still some shark species that aren't endangered by us - and probably quite a few shark species we still don't know exist. Sharks will survive us too."
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6sbbgd | why humans can grow adult teeth, and knee caps, as well as repair broken/fractured bones, but can't regrow them if they get removed? | Biology | explainlikeimfive | [
"dlbgpfn"
] | [
"Both teeth and knee caps are things that we are born with. Specifically, if you didn't know, we are actually born with all our adult teeth. When they \"grow\" in they're actually just shifting out from their little storage zones in our skulls - there are plenty of kinda spooky pics on google showing both baby and adult teeth in xrays/skulls (RIP) of kids. Basically, the simple ELI5 answer is that the various parts of our bodies have the instructions for growing them stored in their genes. So our fingers know how to grow more finger-meat, our leg bones know how to grow more leg-bone, etc. But if the entire thing is removed, then the instructions are gone. So our body can't figure out how to grow it back."
] | [
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hkoqdl | Why is the caramel soft in ice cream bars, but if I were to stick a Snicker's bar in the freezer, the caramel would come out rock hard? | Other | explainlikeimfive | [
"fwtyqmq",
"fwuhxkg"
] | [
"One is carmel sauce and the other is carmel candy. When making it, it’s highly dependent on temperature and the amount of fat. Plenty of recipes online if you want to try making it at home. You need a candy thermometer though."
] | [
97
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csaa11 | How is humidity measured and what does it mean when the weather says it’s 100% humid outside? | Chemistry | explainlikeimfive | [
"exdk5wl",
"exdl8rb"
] | [
"Of the water vapor that the air is capable of holding, how much is it holding? When it is 100% humidity, it’s probably raining, because the air can’t hold another bit of water vapor. So the air drops it. As rain."
] | [
4
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ieqdtk | Why do certain mammals wag their tails when they’re happy while others do it while they’re hostile? | Biology | explainlikeimfive | [
"g2ip4pr"
] | [
"Mammals wag their tails when they’re excited. This could be due to being happy or angry or something else. That said, dogs wagging their tails when happy is a falsehood; dogs can be happy without wagging their tails, and often wag their tails when angry or defensive. If the dog is excited and happy though, tail wagging can also ensue."
] | [
5
] | [
[]
] | [
"url"
] | [
"url"
] |
|
723aew | why is it not possible to mentally "think yourself" into having feelings similar to the effects of MDMA? | Why can't the brain mentally release lots of serotonin on its own without drugs like MDMA? | Biology | explainlikeimfive | [
"dnfgjtw"
] | [
"Meditation can work. I will focus on an object until I can feel my pulse through my finger tips and my heart beat is kinda rocking me back and forth. Then I go for a walk. Moving and looking at things is pretty fantastic then."
] | [
7
] | [
[]
] | [
"url"
] | [
"url"
] |
kqyh71 | How does music frequency work and how does it affect you (432 Hz etc) | Other | explainlikeimfive | [
"gi6fq7h"
] | [
"Frequency means how frequent something is, or how often it happens. Like for instance, how often the air vibrates back and forth. Musical sounds, when we talk about their frequency, we're talking about how many times in a second the movement is repeated. A sound whose frequency is 100 Hz, is a sound which makes the air move back and forth exactly 100 times per second. The frequency of a musical note corresponds to what we hear as its pitch. When different frequencies are heard together at the same time, they produce different timing relationships which can sound really pleasing to our ears, and we call that \"harmony\". The harmonies which exist between different frequencies of notes, arise from mathematical relationships between those frequencies. There are a lot of people who say that music which features 432Hz pitches, or music which is tuned *relative* to a 432Hz pitch, is somehow special, that it activates special parts of our brains or connects us to the universe or something. That is a pile of superstitious mumbo jumbo though, and is [not taken too seriously]( URL_0 ) by anyone who really studies music or acoustics."
] | [
4
] | [
[
"https://www.youtube.com/watch?v=EKTZ151yLnk"
]
] | [
"url"
] | [
"url"
] |
|
m3hr3i | What exactly is an enzyme? | Yes, I did google it but my pea sized brain can't seem to understand it | Biology | explainlikeimfive | [
"gqotgzx",
"gqotau6",
"gqovgg9",
"gqotkvv",
"gqoyhb9"
] | [
"an enzyme is a protein with a catalitic effect. A catalitic is a molecule that is implied in a chemical reaction but that will not be consumed. It is used to either allow a certain reaction to happen or to make a reaction faster."
] | [
10
] | [
[],
[],
[],
[],
[]
] | [
"url"
] | [
"url"
] |
74ohw6 | Asvab scores and what they mean. How do they affect desirability for recruitment? | Other | explainlikeimfive | [
"dnzwtu5"
] | [
"It's pretty simple. They score you on your assorted abilities and aptitude toward certain tasks that you would be doing in your military career. High scores = high aptitude. Recruiters have quotas to meet so if they find someone with a high asvab score, they're going to press that person to join up because they're much less likely to be disqualified down the road. I've been told that the recruiters get \"points\" based on where their recruitee goes in the career. Like they'd get 1 point for an 11B ground pounder and 10 points for nuclear power candidate. Anecdote: I scored the highest score out of my entire high school class when I took the asvab senior year. I had every branch except the Marines practically pounding down my door. Army wanted me in the Signal Corps. Navy wanted me in nuclear power school. Air Force wanted me in their electronics & communication corps (I forget the name). The look of utter disappointment on the recruiter's face when they asked if I had any medical conditions and I said \"Yep, asthma\" was so very sad."
] | [
4
] | [
[]
] | [
"url"
] | [
"url"
] |
|
8at6d4 | Why is it that we find sodium chloride tastes good, but bicarbonate of soda does not? | Also, does each substance contain the same amount of sodium per g? | Biology | explainlikeimfive | [
"dx1c0yu"
] | [
"Because sodium and chloride are both vital to our survival, so our taste receptors have evolved to like the taste of salt. Bicarbonate of soda has one component of salt, the sodium cation, so it does taste a bit salty. But the anion is bicarbonate (HCO3-) which is a base and tastes bitter and unpleasant. No, the sodium per gram is based on the total molecular weight of the salt. NaHCO3 is about 28% sodium by weight, NaCl is about 39% sodium by weight."
] | [
3
] | [
[]
] | [
"url"
] | [
"url"
] |
kqgrxl | What exactly was the Watergate scandal and how did it cause Nixon to resign? | Other | explainlikeimfive | [
"gi3qn02",
"gi3qf1s",
"gi40end",
"gi3rids",
"gi4eobl"
] | [
"a team of operatives working for the Nixon re-election campaign broke into the offices of the DNC (in the Watergate hotel complex) to steal files. They were caught. Nixon tried to use the power of his office to cover up his knowledge and involvement. The scandal led to impeachment proceedings and his resignation."
] | [
103
] | [
[],
[],
[],
[],
[]
] | [
"url"
] | [
"url"
] |
|
82s6f4 | How are we able to draw maps over known parts of the universe? | How are we able to draw maps over known parts of the universe? How much is it images and how much estimates? | Physics | explainlikeimfive | [
"dvciocn",
"dvcf43z",
"dvch9r4"
] | [
"Wow, I am amazed how people can answer this question?! It's so cool to just know that off the top of your head. Or at least understand it."
] | [
5
] | [
[],
[],
[
"https://en.m.wikipedia.org/wiki/Astronomical_survey",
"http://sci.esa.int/gaia/"
]
] | [
"url"
] | [
"url"
] |
ilurgx | Why are calories more important than the weight of the food? | I know it's basic biology that eating under your daily caloric requirement results in losing weight and eating more makes you gain weight. But why is it more important to know that my meal contains 1000 calories instead of knowing that it weighs 750 grams? | Biology | explainlikeimfive | [
"g3upbnx",
"g3upgco",
"g3upcju",
"g3uqybj"
] | [
"There is no benefit to knowing how much your food weighs. It provides no useful information. There can be light food that's high in calories and heavy food thats low in calories. So, if you are trying to lose weight, the weight of the food is not the right thing to pay attention to."
] | [
13
] | [
[],
[],
[],
[]
] | [
"url"
] | [
"url"
] |
5m474v | What is a Deep Space Radio Wave And How Does It Effect Us As A Species? | Technology | explainlikeimfive | [
"dc0upky"
] | [
"A deep space radio wave is just what the name describes - a radio wave coming from deep space (one has recently been pinpointed to come from another galaxy some 3 billion light years away, which I assume is why you're asking this question). They're short, they're rare, they're mysterious, and nobody knows exactly what causes them - but knowing which galaxy sent one out helps us determine that. As for how they affect us as a species, they don't right now, and they likely won't ever, really. It's just one of space's mysteries and we like solving those mysteries - and maybe we'll get some new insight on physics that allows us to build all sorts of crazy shit. On the other hand, maybe it's \"just\" a remnant of a star crossing the event horizon of the supermassive black hole at a galaxy's center, which won't be very practically applicable at all. On the other hand, maybe it's a giant planet-destroying space laser, and the more of these we keep seeing, the more fucked we are. But it's probably not that."
] | [
24
] | [
[]
] | [
"url"
] | [
"url"
] |
|
d43jwt | how does autofocus detect when the object is in focus? | Technology | explainlikeimfive | [
"f07eo37",
"f07f039"
] | [
"There are a few techniques. The most basic is to use maths to judge the contrast. When it is out of focus, the image doesn't have any sharp edges, but there will be sharp edges when it is in focus. So you simply subtract the value of pixels from the value of pixels next to them, add all those differences together to get a single number, and keep adjusting focus so that value is largest. If the value drops when it adjusts focus one way, then try adjusting the other way. Indeed, almost all focus techniques depend on measuring contrast. Better systems provide ways for the system to know which way it should adjust, instead of by guessing and correcting. You know when it is guessing, with videos - you'll see the focus briefly get worse, before getting better. Of course, the old way to focus was to use a system to measure the distance to the subject, and then adjust the focus to what it calculated it to be for that distance. But this requires expansive extra hardware - reasonably complex and carefully built hardware - and so is rarely, if ever, used these days."
] | [
8
] | [
[],
[]
] | [
"url"
] | [
"url"
] |
|
bakqxd | why is women life expectancy longer than men's? | Biology | explainlikeimfive | [
"ekc7d06"
] | [
"Many reasons. 1 - Men tend to take bigger risks, including doing things that are potentially lethal. 2 - Men tend to work more dangerous jobs such as firefighting, construction, and military service. 3 - Men are more likely to develop heart related issues, which may have a biological component but also is impacted by lifestyle. 4 - Men are typically larger than women which has a negative impact on lifespan though this isn't 100% clear in humans. 5 - Men are more likely to commit (well really succeed) at suicide. 6 - Men tend to be less socially connected which has been found to increase the probability of death. 7 - Men tend to avoid doctors. So all in all, it's a lot of different factors."
] | [
23
] | [
[]
] | [
"url"
] | [
"url"
] |
|
5o0ns9 | Why are advertisement on the Internet that are scams not against the law? | Other | explainlikeimfive | [
"dcfoihj",
"dcfqkhw",
"dcg0ge7"
] | [
"Nearly all scams *are* against the law, and intentionally advertising an unlawful scam is *also* usually against the law. The problem is discovering, and proving, that it's a scam."
] | [
25
] | [
[],
[],
[]
] | [
"url"
] | [
"url"
] |
|
8gfqv3 | What does the snake on the medicine emblem mean? | Wikipedia only tells the roots of this caduceus, but I don't understand very clearly the meaning of the elements it has on it. | Culture | explainlikeimfive | [
"dybcx35",
"dybcuzl"
] | [
"[The Caduceus]( URL_1 ) is actually a symbol of Hermes, often misused as a medical symbol or mistaken for the [Rod of Asclepius]( URL_0 ). The Caduceus was not meant as a symbol of medicine, and as such there isn't meaning behind the snakes as a medical symbol. It was simply misused enough times (documented mistakes by the way) to be accepted as one. These errors are documented to have first occured in USA. However, the caduceus has a possible reason for being linked to medicine, which is a procedure using twine to tie up a limb tightly to prevent removed parasites from easily burrowing back into the muscle tissue when being removed. The Rod of Asclepius is named after the deity of healing and medicinal practice, Asclepius. The rod and snake are two of his symbolic attributes merged into one symbol, suspected to have been done so by the Asclepian cult at the time. The snake in the Rod of Asclepius is thought to represent several things: The ambiguity of drugs (the word for medicine in Greek shares the same word as drug and poison) Snake parts and venom used in some medical treatments The snake is thought to be of the scientific name [Elaphe Longissima]( URL_2 ), a non venomous snake which ate rats, a species of Rat Snake and is more commonly known as the Aesculapian Snake. Edit: Formatting"
] | [
17
] | [
[
"https://en.m.wikipedia.org/wiki/Rod_of_Asclepius",
"https://en.m.wikipedia.org/wiki/Caduceus",
"https://en.m.wikipedia.org/wiki/Aesculapian_snake"
],
[
"https://en.m.wikipedia.org/wiki/Rod_of_Asclepius"
]
] | [
"url"
] | [
"url"
] |
iw04p0 | If combustion requires oxygen, how does gunpowder burn inside a sealed bullet casing once it is fired? | Chemistry | explainlikeimfive | [
"g5uxlmf",
"g5uxpoy",
"g5uxvxc",
"g5uxsp3",
"g5v0gp2"
] | [
"Like most explosives, Gunpowder contains its own oxygen in the form of saltpetre. If it didn’t have oxygen in it, it would burn no faster than a regular charcoal flame."
] | [
38
] | [
[],
[],
[],
[],
[]
] | [
"url"
] | [
"url"
] |
|
ju8ket | what exactly are tesla coils? | I know they throw power through a few coils and end up shooting lighting. But is it really easy to make, or difficult? | Technology | explainlikeimfive | [
"gcabfa5"
] | [
"They are a kind of air core transformer. There are two coils, one small wrapped around a really large one's bottom. By putting very abrupt pulses of electricity through the smaller coil then cutting it off completely, the magnetic field generated by the smaller coil gets reabsorbed by the larger one instead and, since it has so much more turns, it manifests as a stupidly high voltage (but low current) pulse. URL_0"
] | [
4
] | [
[
"https://www.youtube.com/watch?v=LbTyEratSTI"
]
] | [
"url"
] | [
"url"
] |
8hl99u | why did the Sun not burn out instantaneously? | I know it's a ball of gas. I know gas explodes instantly when lit. If it's really,really condensed gas then surely it's liquid. Is it just that massive ? | Physics | explainlikeimfive | [
"dyko8mh",
"dykq8vf",
"dyknkug",
"dykptxz"
] | [
"I know this may sound confusing, since preschoolers are taught differently so that they get a less confusing perspective on the world, but the sun is not technically \"on fire\". Ancient philosophers thought it was, but for \"fire\" you need \"Oxogen\", and the sun doesn't have any significant amount of oxogen within it. What the sun is going through isn't actually fire, but is instead, a incredibly long lasting series of nuclear explosions. Kind of like an atom bomb or a nuclear reactor, but in reverse. (an atom bomb releases energy by splitting big atoms apart. The Sun releases energy by smashing tiny atoms together) These reactions will only really happen within the very center of the sun, bit by bit, but the entire sun is made out of material which can be fuel for this process, so this can take an extremely long time. Our Sun will have lived about 10 billion years total by the time it burns out. The light that the center of the sun gives off has to travel through enough gas on the outside that it inevitably bounces several times before making it to the surface, making it seem like the gas is supplying the light. And the gas seems like a relatively liquid surface due to how much gravity the sun has, so that it pulls and smushes even the gas down far enough that it doesn't seem like gas from a distance. People have being trying to replicate the nuclear processes of the sun within labs since at least the cold war, in the hopes of near infinite energy, but considering the conditions we'd need to sustain this miniature sun, it seems pretty impossible."
] | [
21
] | [
[],
[],
[],
[]
] | [
"url"
] | [
"url"
] |
avt65q | Why does text on a PDF not appear blurry no matter how much you zoom in? | Technology | explainlikeimfive | [
"ehhglac",
"ehhiu3t",
"ehhosiw"
] | [
"Because a PDF is not an image that goes under compression. Pdf can contain other stuff, so when zooming in on fonts, its the same as doing it on word (in theory)"
] | [
92
] | [
[],
[],
[
"PC.net"
]
] | [
"url"
] | [
"url"
] |
|
n3e71i | Why does scar tissue sunburn more easily than normal skin? | I've noticed when I'm in the sun even with appropriate sunscreen areas that I've suffered injuries to in the past almost immediately become red, even though they do not have visible scars. | Biology | explainlikeimfive | [
"gwpbnwg"
] | [
"Scar tissue differs from regular skim in a few ways, it's the same ingredients but it's built and layered differently because one is grown at a steady rate and scar tissue is an emergency response so develops differently. If the scars are lighter in color to your normal skin tone then we can see that this tissue has less melanin so will react differently to the sun. If the scars don't have hairs then you can tell how deep the wound was. (Deep enough to damage/remove the hair follicles) which might also mean the sweat glands are damaged meaning the skin is drier and less supple and more prone to burning. I'm sorry how I wrote this, I'm having brain fog lol I swear English is my first language but uhm I'm struggling to sentence rn lol Fun fact; severe scurvy (vit c defieciency) can cause old scars to reopen. Because scar tissue isn't ever done healing, skin is always replenishing itself and scurvy interrupts that process."
] | [
9
] | [
[]
] | [
"url"
] | [
"url"
] |
8qzadq | Why are images of people on Wikipedia so bad? | Other | explainlikeimfive | [
"e0n8yil",
"e0n9hru"
] | [
"Professional photos are copyrighted and/or under license. So many of them are user\\-taken, modified, or grabbed from videos."
] | [
10
] | [
[],
[]
] | [
"url"
] | [
"url"
] |
|
871z0z | Why is there a "motion blur" effect when moving something around at night? | Biology | explainlikeimfive | [
"dw9ky7k"
] | [
"Your retina cells are not able to turn off as quickly as the object moves, since they are chemically operated. You don't notice it in normal lighting, but when the background is very dark it becomes apparent."
] | [
7
] | [
[]
] | [
"url"
] | [
"url"
] |
|
72y656 | Why do humans like eating salty food? | I understand that humans have adapted to like certain food tastes because they are generally more nutritious IE humans like sweet foods because it means there's sugar in it. But why do humans like the salty taste? Wouldn't salt eat up the fluids that you need to live? | Biology | explainlikeimfive | [
"dnm6ig6",
"dnm6gga"
] | [
"We need salt to live. We didn't have access to as much salt as we do now, so we adapted to want as much salt as we can. The only problem is that evolution hasn't caught up with the abundance that modern society has to offer, so we eat a lot more salt than was \"intended\", making it unhealthy."
] | [
9
] | [
[],
[]
] | [
"url"
] | [
"url"
] |
kps79z | If we have two eyes, and the two eyes see separately, why do we see only one whole image and not 2 separate images? | Biology | explainlikeimfive | [
"ghznqie",
"ghzo9ab"
] | [
"* Your brain mushes them together. * This allows you to focus on just one thing but also have a sense of how deep that thing is. * It's the same reason you have two ears but you \"hear\" everything together."
] | [
19
] | [
[],
[]
] | [
"url"
] | [
"url"
] |
|
jicsiz | Explain to me, an Irish person, why anyone thought a HOA was a good idea? And what it’s actual function is? | Economics | explainlikeimfive | [
"ga5ofe7",
"ga5u07s",
"ga5qq4g",
"ga5sgsp",
"ga5ujac",
"ga5nvyd",
"ga5uwmq"
] | [
"Sometimes they're there to enforce a standard of appearances on the community. Other times there is community property that has to be maintained. Like maybe a park in the middle. There are repairs that need made, staff to keep the lawn trimmed and the trash picked up. The restrooms cleaned etc. It's just turned into one of those good idea on paper but shoddy execution problems"
] | [
25
] | [
[],
[],
[],
[],
[],
[],
[]
] | [
"url"
] | [
"url"
] |
|
awke2e | What is the actual impact of one person not eating meat? | Like, ain't that meat get sold to someone else? Or even go bad and get thrown away? When I quit eating meat am I in fact affecting it's production down to the level in which less animals are being slaughtered or am I just choosing not to be part of it? Also I'm not sure how to flair it so my apologies. | Economics | explainlikeimfive | [
"ehn4o20",
"ehn5k2e",
"ehn4iae",
"ehn672s",
"ehn7c9e"
] | [
"You could make the same argument for voting, recycling or any number of “socially responsible” activities. One person doing those activities is not going to make a significant impact. But you do them with the idea in mind that you are part of a group or movement and, together, you’ll make a difference."
] | [
15
] | [
[],
[],
[],
[],
[]
] | [
"url"
] | [
"url"
] |
a2l31x | How come when you submerge yourself completely underwater water doesn’t completely fill up in your ear but if you turn your head to the side water will fill up in your ear? | Biology | explainlikeimfive | [
"eazc6xy",
"eazn0ig"
] | [
"Water traps an air bubble in your ear. Air is less dense so it wants to rise in water. It can't at that angle. Then turn your head and the bubble escapes so water fills the void."
] | [
26
] | [
[],
[]
] | [
"url"
] | [
"url"
] |
|
f0rbyp | How do we know that Pi's decimals never repeat? | Mathematics | explainlikeimfive | [
"fgwyosx",
"fgx931w"
] | [
"There are proofs that Pi is irrational, ie it can't be the result of the division between two integers. There's another proof that when you try to write down an irrational number as a decimal fraction, you get a never ending sequence of non repeating digits. The proof that Pi is irrational is a bit complex for eli5, but here it is: URL_0"
] | [
20
] | [
[
"https://en.wikipedia.org/wiki/Proof_that_%CF%80_is_irrational"
],
[]
] | [
"url"
] | [
"url"
] |
|
67oekt | Why have built-in webcam covers not surged in popularity yet? | Technology | explainlikeimfive | [
"dgrx1gr",
"dgrx2sz"
] | [
"I think offering a built-in cover would be perceived as an acknowledgement that the product is not entirely secure in its own right. It's like selling a house with bars on the windows. Makes you wonder what's wrong with the neighborhood."
] | [
14
] | [
[],
[]
] | [
"url"
] | [
"url"
] |
|
ha04xv | Why can’t there be just one currency in the whole world? | Economics | explainlikeimfive | [
"fuzt04m",
"fuzyexp"
] | [
"Because there isn't enough uniformity of economic development or performance throughout the world to allow it without negative consequences. Proper operation of the common European currency requires all the countries involved to run their economies in more or less the same way, with limits set on how far they can deviate from the norm. For example, you can't set widely different interest rates to simulate industry or control inflation. To do so would mean wealth flowing either in or out of the country as people moved investments to get the best return."
] | [
6
] | [
[],
[]
] | [
"url"
] | [
"url"
] |
|
6jpmsi | Why do the cups of water I set out at night end up with bubbles and a "stale" taste in the morning? | Chemistry | explainlikeimfive | [
"djg3k3v"
] | [
"The bubbles have something to do with the oxygen being gassed out especially if the water is cold, since cold water holds more oxygen. And the taste is CO2 being dissolved in the water over the period of time which creates a chemical compound H₂CO₃ - carbonic acid. So the increase of the acid changed the taste of the water."
] | [
5
] | [
[]
] | [
"url"
] | [
"url"
] |
|
cpayjo | What is cryogenic freezing? How can living beings be resurrected through it? | Biology | explainlikeimfive | [
"ewodj0t"
] | [
"To be clear, people are being cryonically preserved in the *hopes* that one day science will figure out how to repair and resurrect a frozen body. The technology doesn't exist, nor is it likely to exist in the near future, if at all. Basically, people are spending vast sums of their legacies betting that: 1) the technology to resurrect and repair the freezing damage is developed 2) the technology to cure whatever originally killed them is developed 3) human memory and mental function are not permanently erased by freezing (due to the denaturing of brain chemistry and damage to cells, even if repaired) 4) that their body will be preserved quickly enough for any future reanimation technology to work 5) that their body will be well looked after by the cryonics company for decades/centuries (based on some reports I've seen, not always the case) 6) that the cryonics company won't go out of business 7) that far future societies will be somehow incentivised to revive elderly, anachronistic, potentially disabled/dependant, legally-dead people with no understanding of the current world, beyond defrosting a select few for historical, curiosity purposes I mean, it's worth a shot of you've got the money, but I wouldn't get my hopes up."
] | [
3
] | [
[]
] | [
"url"
] | [
"url"
] |
|
7o0swg | Why you need blue and red to view 3d, why cant you use other colors? | Technology | explainlikeimfive | [
"ds606wd",
"ds5zsy9"
] | [
"They aren't strictly required, it could be any color. Red, Green and Blue would work better because that's the colors the cells in the eyes can see. So blocking all but one of those would result in the clearest pictures. Red and Blue just so happened to be the cheaper than Green filters to make."
] | [
40
] | [
[],
[]
] | [
"url"
] | [
"url"
] |
|
drjllj | How did the different sides in past wars (esp WW1 and WW2) communicate and collaborate with each other so effectively when organizing their offense and defense in different countries around the world? It sounds like a logistical nightmare, even with today's communication devices. | Technology | explainlikeimfive | [
"f6isv32",
"f6itdc5",
"f6iumwf",
"f6jtex0"
] | [
"Wars are not planned \"on the fly\", even today. People sit down at desks in the War Department and write out plans, wargame those plans, and then send them out. Commanders in the field tailor the plan to the forces on the ground, and communicate them to their subordinates. This used to be on paper, then on coded message, then in coded radio messages."
] | [
13
] | [
[],
[],
[],
[]
] | [
"url"
] | [
"url"
] |
|
juu4nk | How does Google know my actual location when I'm using a VPN but YouTube allows me to watch region restricted clips at the same time? Shouldn't they both be "fooled" into thinking I'm at the same location? | Technology | explainlikeimfive | [
"gcg4ww6"
] | [
"Youtube figures out your location from where your internet connection is coming from. A VPN masks this. Google will usually base your located on your GPS location, not your internet connect. The VPN does nothing to mask this. And even if you are not using GPS, they can still get your location from the nearest cell phone towers. That information is also not changed by the VPN."
] | [
7
] | [
[]
] | [
"url"
] | [
"url"
] |
|
5wfsqf | The difference between Triglyceride, HDL and LDL. | Biology | explainlikeimfive | [
"de9vozw"
] | [
"Triglyceride is the fat (strictly speaking it's three fatty acid molecules linked together by a glycerol molecule) which is carried in your blood in a 'bag' made of either HDL or LDL cholesterol. The bag is made of HDL if it's moving from your body to your liver, i.e. taking fat to be 'burned' and LDL if it's the bag taking fat from your liver to your body's fat cells to be stored. (very simplified). In certain circumstances the liver can \"panic\" and desperately produce partially empty bags made of VLDL, which is spikey and more likely to get \"caught\" in your blood vessels and cause clots. VLDL is the only actually \"bad\" cholesterol. High or low HDL or LDL are just indicators of which way the fat is flowing."
] | [
4
] | [
[]
] | [
"url"
] | [
"url"
] |
|
ay8lli | What is a dissertation? What is the purpose? What kind of degrees have them? Why? Why are they so stressful? | Other | explainlikeimfive | [
"ehz35b0",
"ehz5p2w"
] | [
"ELI5: You are asked to imagine or create in your imagination something that doesn’t exist but is connected to what we do know exists, you then take that something from your imagination, think about that one thing for 4-7 years, and then you have to prove that that thing that only existed in your imagination is in fact real. A dissertation is the proof of you did (and can do) that process. The end result is that you’ve done something to add to all of human knowledge."
] | [
17
] | [
[],
[]
] | [
"url"
] | [
"url"
] |
|
66ensi | Every country seems to know how terrible Kim Jong Un is and how oppressed the people of N. Korea are. How come the worlds more powerful nations haven't "taken him out" by now, Either overtly or covertly? | Culture | explainlikeimfive | [
"dghwli8",
"dgi3tq3",
"dghw82y",
"dghwanl",
"dgi3wr2",
"dghwapi",
"dghw5jj",
"dgi15wd",
"dgi937l",
"dgio55y"
] | [
"1. Not every nation cares about North Korea all that much. As much of a headache as North Korea may be to Russia and China (the only non-Western nations with the power and reach to affect North Korea), they've generally not cared at all when dealing with foreign nations no matter how reprehensible their governments are. 2. Since 1950, North Korea has been a useful buffer for China. Throughout the Cold War, it was feared that any war with North Korea would draw China back in again. And even since then, China has largely shielded North Korea with their veto power in the UN. 3. Speaking of China, while it is unlikely China would go to war with the US or Japan over North Korea, there has never been a resolute and solid answer that they wouldn't get involved either. As long as that question persists, the question is still: is fighting North Korea worth the risk of a major war with China? 4. The policy of most Western nations towards North Korea has been one of isolation and/or sanctions towards the regime. The hope is that political, economic, and social instability will topple the regime from the within and limit the loss of lives to people of other nations and effect a more peaceful transition. Unfortunately, that hasn't worked out despite two power transitions since Kim Il Sung, the founder of North Korea, died. 5. The Korean War, fought from 1950 to 1953, saw over 2 million people die in just a span of 3 years, making it one of the most bloody and destructive wars post World War II. Any actual or perceived provocation towards North Korea that may well trigger a full blown war is cast with a wary eye by all parties involved, especially so now that South Korea has grown as prosperous as it has and since it is a major economic player now. In sum: * The costs of war would be high, even if victory is assured for South Korea/the US/the remaining nations of the United Nations Command. * There are question marks about China's role in all of this that make the risk even higher * The long term goal has always been to hope that reform and/or internal collapse will happen by itself barring nothing changing in the status quo. * The cost to rebuild the nation would be immense. Even the US at least tried rebuilding Iraq after 2003. Where would you even begin with North Korea?"
] | [
89
] | [
[],
[],
[],
[],
[],
[],
[],
[],
[],
[]
] | [
"url"
] | [
"url"
] |
|
k536zr | My lamp has flickered a few times tonight, then flipped the whole houses power when the bulb blew, despite being turned off. Instantly all the houses on and around my street have their house alarms going off! How did my bulb break the whole area?! It's 5:28am. I just pissed off a whole postcode | Engineering | explainlikeimfive | [
"gecc4ac",
"gecdt8g"
] | [
"There's no way your light bulb caused any kind of damage to anything else in your house, much less the neighbor's. Are you sure there wasn't a neighborhood-wide power surge?"
] | [
12
] | [
[],
[]
] | [
"url"
] | [
"url"
] |
|
jxciqu | How did the typing keyboard layout come about? | Technology | explainlikeimfive | [
"gcvm0jn",
"gcvmepl",
"gcvmbo2"
] | [
"Due to the physical limitations of a mechanical type writer. For fast typers, the physical arms that would extend outward to type a letter would get intertwined with another arm if those two letters were both very close together as well as typed in quick succession. The solution was to create a keyboard layout that would have common sets of letters be separated on the keyboard to reduce the risk of the arms getting intertwined. Because everyone was used to the layout by the time keyboards came out, it kinda just stuck around."
] | [
31
] | [
[],
[],
[]
] | [
"url"
] | [
"url"
] |
|
5pmyck | why do people who snore fall asleep within a few minutes after laying down? | Other | explainlikeimfive | [
"dcsd1lx"
] | [
"People who snore don't rest well--the airway constriction disrupts sleep states as the body relaxes, and falling asleep quickly can be a sign of sleep deprivation."
] | [
8
] | [
[]
] | [
"url"
] | [
"url"
] |
|
91z1ra | Why are farmers struggling financially when there are more people than ever before to feed, people eat more on average than ever before, we know more about the science of agriculture than ever before, and there is more advanced machinery for planting / harvesting than ever before? | Economics | explainlikeimfive | [
"e31uhry",
"e31vv9j",
"e31wpwx"
] | [
"Automation is eliminating most of the simple jobs for farmers. A typical farm machine does the work of 40 laborers. So now being a farmer means you need a ton of money to operate a fleet of expensive machines."
] | [
10
] | [
[],
[],
[]
] | [
"url"
] | [
"url"
] |
|
81r8tg | How and why does only one spermatozoid enters the egg? | When i was younger i thought twins happened when two spermatozoids entered the egg, but found out that, for the twins to be identical, the egg would have to split in two embryos or something. So my thinking went to nonidentical twins. But then i learned that nonidentical twins come from two different eggs (and, of course, two different spermatozoids). And so the thought kinda died, but i watched Look Who’s Talking a couple of days ago, and it revived. | Biology | explainlikeimfive | [
"dv4jqdy",
"dv4jxdc"
] | [
"The egg first initiates what's called the _fast block on polyspermy_, which is essentially a hardening of the outer surface of the egg. It then undergoes a _cortical reaction_, which further secures the egg from further attachment. Having more than one sperm attach to an egg causes faulty chromosome formation and thus an inviable zygote."
] | [
5
] | [
[],
[
"http://www.kup.at/kup/images/browser/6630.jpg"
]
] | [
"url"
] | [
"url"
] |
6nprx0 | How did religion start, why did the earliest humans think there was/is a god, how did it branch off into over 4,200 different types of religions? | Culture | explainlikeimfive | [
"dkbac85"
] | [
"The early religions generally trace back to elemental spirits. These weren't spirits that controlled the elements, they *were* the elements. Gaia was literally the earth, but she was also able to walk upon it. Ancient people were trying to provide reason and logic to a natural world that they could not understand or predict. Why did the harvest suck this year? Why did the next village over get flooded? Why has there been so little rain? All of those are very difficult to answer as a primitive people, but if someone in the village killed the cool deer he saw and then a drought starts, wellllll maybe you shouldn't do that next time. Sacrifice your best bull and then the rains start? Well clearly the rain spirits like bull sacrifices, keep that in mind for next season! Most religions trace their gods back to elementals, they all had different names but everyone had a spirit for rain and fertility and earth and the sea(if they were coastal). As the religions evolved to create gods who had power over these elements, instead of being the elements, they were grouped differently resulting in different religions. Many religions in a region share a lot of similarities because people would move around bringing stories from their homeland and integrate it into the stories of their new land. There are hundreds of different religions, yet there are remarkably similar stories that exist with all of them."
] | [
7
] | [
[]
] | [
"url"
] | [
"url"
] |
|
a47nfg | Why do months in the calendar have different amount of days? | Wouldn't it just be easier if the months all had the same amount of days? I don't understand | Culture | explainlikeimfive | [
"ebc6q3n",
"ebc6lnw"
] | [
"Months started out being 29 days long to follow the cycles of the moon but this led to there being only 350(ish) days in a year which caused the seasons to drift. Julius Caesar changed this to make the months longer so that we'd have 365 days in a year and since he couldn't evenly split 365 up 12 ways, they had to take turns this was called the julian calendar. (He also added an extra day every 4 years to compensate for the fact that year is actually 365.25 days long.) However, this wasn't perfect and by the 16th century we'd drifted by 10 days so Pope Gregor the whateverth changed the date and made it so every century year that was not divisible by 4 would not be a leap year (The year 2000 was a leap year, but 2100 won't be). This is called the gregorian calendar and we use it to this day."
] | [
17
] | [
[],
[
"https://www.youtube.com/watch?v=I2itlUlD10M"
]
] | [
"url"
] | [
"url"
] |
9889qe | Why can cleaning products never get that .01% of bacteria? | We all here it, "This product kill 99.9 percent of bacteria!" Is this a false or is there a reason for it? | Other | explainlikeimfive | [
"e4e2alz",
"e4e31m7",
"e4e4cfe"
] | [
"Marketing. They don't wanna get sued if/when their product fails to get that 0.01% of bacteria, particularly when it's probably going to be a failure on the consumer's side of things, rather than the manufacturer's fault."
] | [
24
] | [
[],
[],
[]
] | [
"url"
] | [
"url"
] |
845kp2 | Why do brand name drugs all have such distinctly "druggy" sounding names? (Prozac, Vyvanse, Viagra, Daytrana, Centrix, Cialis, etc.) | Chemistry | explainlikeimfive | [
"dvmxa4o",
"dvmxodi",
"dvmxmvq"
] | [
"The drugs names are usually shortened versions of the drug’s scientific names, which all come from the specific “recipe” for whatever substance you are buying. This isn’t the rule though, some companies just make zippy brand names for their drugs that might have something to do with their effects, like “Claritin” resembling the word “clarity”."
] | [
5
] | [
[],
[],
[
"http://www.takerx.com/class.html"
]
] | [
"url"
] | [
"url"
] |
|
iclcfh | How does the sun work? Like, won't it run out of energy one day, or is it fueling itself? | Biology | explainlikeimfive | [
"g237bxp",
"g238oz9"
] | [
"It will run out of energy eventually. The sun uses about 600 million tons of hydrogen per second. It's just so big it will still take billions of years to run out."
] | [
9
] | [
[],
[]
] | [
"url"
] | [
"url"
] |
|
6ov4bb | What does clearing cache and cookies do? | Technology | explainlikeimfive | [
"dkkfber"
] | [
"Cookies are little files stored by websites. They contain information that the site has to temporarily leave in your computer, like the fact that you are logged in or that you have closed the cookie prompt or your personal preferences sometimes, if you are not logged in on YouTube for example, it uses cookies to remember what videos you watched and give you suggestions based on it. Cache is temporary memory used to load sites that you have already visited or that you visit often faster. When either of those get corrupted, it may make some sites load not like they are supposed to. In such cases, cleaning your cookies and cache might fix it. *I’m not an expert though, correct me if I said something wrong.* Look it up on Wikipedia if you want to learn more about them: [HTTP cookie]( URL_1 ), [web cache]( URL_0 )"
] | [
3
] | [
[
"https://en.wikipedia.org/wiki/Web_cache",
"https://en.wikipedia.org/wiki/HTTP_cookie"
]
] | [
"url"
] | [
"url"
] |
|
j8ficn | why are the skins of fruit more nutritious than the insides? | Biology | explainlikeimfive | [
"g8aru66",
"g8aq8ut",
"g8asivx",
"g8awzrc",
"g8bdnvn",
"g8aq55q",
"g8c6k16",
"g8c66mz",
"g8bqpc7",
"g8c9u6c",
"g8bbfck",
"g8cg6un",
"g8biijg",
"g8dqm6b"
] | [
"because fruit aren't intended to be nutritious, they're intended to be tasty, which means the bulk of them is relatively homogeneous fluff with lots of sugar. The skin is the only part which has to actually do something important, so its loaded up with a variety of vitamins and minerals and other cellular necessities to do its job. same applies to like, why wheat germ is more nutritious than the rest of the grain. The rest of it is just an energy store. The germ has all the parts that grow and do stuff, so all the goodies are found there."
] | [
9791
] | [
[],
[],
[],
[],
[],
[],
[
"https://skeptics.stackexchange.com/questions/10169/are-most-of-the-nutrients-of-vegetables-and-fruits-contained-in-the-peel"
],
[],
[],
[],
[],
[],
[],
[]
] | [
"url"
] | [
"url"
] |
|
defjy9 | Does anyone have a good analogy to help explain why people in space age slower than people on earth? It's a hard concept to grasp for me and would appreciate some help! | Physics | explainlikeimfive | [
"f2uukko",
"f2uuatj"
] | [
"It's not being in space but rather traveling at high velocity. There are good ELI5 posts on why this happens such as [this one]( URL_1 ) It's near impossible for people to reach such high speeds on Earth because the air itself resists movement, but by leaving the atmosphere, astronauts can reach orbital velocity [which is extremely fast by terrestrial standards]( URL_0 ) and start seeing actual relativistic effects."
] | [
7
] | [
[
"https://what-if.xkcd.com/58/",
"https://www.reddit.com/r/explainlikeimfive/comments/2bm5ff/eli5_why_does_time_slow_down_at_relativistic/"
],
[]
] | [
"url"
] | [
"url"
] |
|
hlb4lp | How do video game mods work? | How do you make them? Why can’t you use them on consoles like Xbox? | Technology | explainlikeimfive | [
"fwxws7o"
] | [
"You can't do mods on consoles because they require games to be digitally signed, and the file system is locked down, so there's no way to get mods files in there. Skyrim and Fallout 4 allow mods on PS4 and Xbox One by downloading them in game, and then the game puts the files in the correct spot. Mods work because games are designed to read files to know what need to be loaded next. If you know how to change existing files, or add in new files, then you can change what the game displays or does. Some games have built-in mod support. Bethesda Game Studios provides their creation kit to make modding their games very easy. They use a plug-in system that makes changes when a mod is loaded. There's no detection or protection against mods changing the same thing, so if you have multiple mods that change the same thing then the mods might not work or the game might crash."
] | [
9
] | [
[]
] | [
"url"
] | [
"url"
] |
64jto6 | How will a self-driving car react when facing a choice: killing the driver or a pedestrian? | Repost | explainlikeimfive | [
"dg2nfcc"
] | [
"There wouldn't be that kind of decision baked into it, deciding which lives to kill. It would follow the standard programming for collision avoidance. If it detected something heading toward it, it would brake, or steer into an available space to avoid the collision, or both. Nothing is perfect. Humans do this already. If a ball bounces into the road, you stop or swerve. Hopefully paying attention as you're supposed to at the lanes and traffic around you so you always have somewhere to go in such a situation. An automated car would do the same thing. The default solution would be to hit nothing. It doesn't matter if its a person or a vehicle. If the sensors detect a probable collision it would slow or move to prevent it. A person is just another thing not to hit. You would have code that also makes sure there is an out in a situation, such as making sure cars are spaced appropriately enough that there's an escape lane, proper distance between vehicles, and everything else. Are things perfect? No, but people aren't perfect either. Accidents happen, usually because of someone doing something stupid, like running into a street."
] | [
4
] | [
[]
] | [
"url"
] | [
"url"
] |
|
8d0lz1 | Why, in most commercial settings, is the toilet seat C-shaped but in residential homes are O-shaped? | Other | explainlikeimfive | [
"dxjbalj"
] | [
"source: URL_0 > The two-prong, open-front seat is required by the plumbing codes adopted by most public authorities in the U.S. “All water closet seats, except those within dwelling units, shall be either of the open front type or have an automatic seat cover dispenser,” > This is largely a matter of hygiene. No matter what kind of junk you’re packing, u-shaped seats give you a little breathing room to avoid touching the seat with your genitals, and provide one less place for urine to splash. > Open-front toilet seats are largely designed to make it easier for women to wipe, according to Lynne Simnick, the senior vice president of code development at the IAPMO. The opening is designed to “allow women to wipe the perineal area after using the toilet without contacting the seat,” she says. So basically, open toilet seats are designed for front-wipers. (Clearly the ladies in question have not been lectured on how to prevent UTIs.)"
] | [
9
] | [
[
"http://mentalfloss.com/article/64677/why-are-public-toilet-seats-u-shaped"
]
] | [
"url"
] | [
"url"
] |
|
bsyap6 | What does DJ Khaled really do in a song? Like what's his job about beside randomly shouting his name in the track? | Culture | explainlikeimfive | [
"eorujpe",
"eoruff7"
] | [
"Dj Khaled is a songwriter and producer. So, while it may seem that all he does is yell WEDABEST!!!, he actually helps write lyrics and create the beats to his songs. Then he tries to find other artists to get on his track."
] | [
5
] | [
[],
[]
] | [
"url"
] | [
"url"
] |
|
i6z9lu | If you space out and don’t focus on anything, you’ll see very little, but clear objects on your eye illuminated by light. What are they? | Biology | explainlikeimfive | [
"g0yvtyv"
] | [
"google says that those floaters are collagen. It's a protein that does... something in the back of your eye, and as you age, small fibers of it shrivel up and come off. Technically we're seeing the shadows they cast on our retina."
] | [
3
] | [
[]
] | [
"url"
] | [
"url"
] |
|
677wd2 | why do some people instantly fall asleep on car rides? | Biology | explainlikeimfive | [
"dgoeaxw"
] | [
"Not going to be a full comment but I will give it a go. Vibration. Everybody reacts to different frequencies in odd ways (brown noise) the constant vibration of the car will cause drowsiness. The reason opening the window helps is not the breeze it's because the frequency of the vibration has been changed. I work with aircraft and during the design and test process the frequency that the aircraft vibrates at has to be looked at seriously because certain frequencies cause serious problems to people. There may be other reasons but this is a factor."
] | [
3
] | [
[]
] | [
"url"
] | [
"url"
] |
|
asvpoe | How a company’s P & L, balance sheet and cash flow statement relate to each other and what they tell you about a company’s current state and future | Been working as an accountant in the manufacturing for retail business for about 23 years now. Always for a small to medium size business Always with a CFO responsible for creating financials so it’s never been my responsibility but I would love to be more educated. | Economics | explainlikeimfive | [
"egxh5j1"
] | [
"Think of a lemonade stand. P & L says how much money you made in a certain time. Yesterday, You sold 20 gallons of lemonade for $100, used 100 lemons and sugar that cost $40, so you made $60 in net income. Balance sheet lists all your assets and liabilities at a particular moment. You have $50 in cash in the register, inventory of 250 lemons and 5 bags of sugar worth $150. You owe your mom $70 cause she loaned you some cash, so you have equity of $130. Remember that assets equals liabilities plus equity. Cash flows explains how your cash was used for a period. Did you pay off the grocery store? Did you build a second lemonade stand? In general, any financial statement is not terribly informative unless you have something to compare it to. A prior year, a competitors statement, an industry standard, etc."
] | [
3
] | [
[]
] | [
"url"
] | [
"url"
] |
7ziltz | What is the difference between a hive mind and a group of individuals working together? | Biology | explainlikeimfive | [
"duo9ywo"
] | [
"A Hive Mind is a single entity in control of the actual minds of their subjects, forcing them to act even if they find the process painful and gruelling. Individuals working together is because they're just that: Individuals. They have the ability to think freely and against the work, and can oppose anybody or anything forcing them to participate in the work."
] | [
19
] | [
[]
] | [
"url"
] | [
"url"
] |
|
9myr7u | How Multiple Sclerosis occurs in humans? | Biology | explainlikeimfive | [
"e7ifljl"
] | [
"Multiple Sclerosis (MS) Is an autoimmune disease, which means that your own immune system is attacking you. In the case of MS your immune system attacks the myelin sheiths around your nerve cells, which are nessecary for fast information transmission between the cells. This desctruction leads to lower transmission speed of information, which leads to over and undercompensation, aka tremors etc. Lets say you try to grab something, so you move your arm towards it, until youre at desired length and then tell your arm to stop, in the case of MS this stop signal simply takes too long and you go past your target, so you tell your arm to go back and again, when at desired length, tell it to stop only to shoot past the object again in a basically endless loop. The exact causes of autoimmune diseases are pretty much unknown, but in the case of MS, we suspect that its either genetically, or caused by infections, which carry similar surface antigens like the myelin sheiths, thous causing antibodies against them. Although we have no certain infection known, we suspact viruses such as EBV, or HHV6, or bacterial infections like Chlamydia and many more to be *possible* causes."
] | [
3
] | [
[]
] | [
"url"
] | [
"url"
] |
|
6042vw | Turkey's Constitutional Referendum | Culture | explainlikeimfive | [
"df3d5rr",
"df3ds3v",
"df3lhrk",
"df3e0dj"
] | [
"TLDR: this is a move by Erdogan to consolidate power. There are 18 proposed changes, including one to remove the Prime Ministerial office, and another to increase the number of MPs. Ultimately it gives Erdogan more power. Questions have been raised about separation of church and state, democratic freedoms and judicial processes. It appears that the conservative government supporters want the bill to pass. There are claims of intimidation and suppression of those against the changes. Source: URL_0"
] | [
36
] | [
[
"https://en.m.wikipedia.org/wiki/Turkish_constitutional_referendum,_2017"
],
[],
[],
[]
] | [
"url"
] | [
"url"
] |
|
8tnwoc | What would really happen to an astronaut if they removed their helmet in space? | Biology | explainlikeimfive | [
"e18xtd5",
"e18y9e3",
"e18zlje"
] | [
"When you're exposed to vacuum, the air in your lungs is forced out through your mouth. After that, you should be able to make breathing motions normally, but there will of course be no air to breathe. You will not experience any exploding eyeballs or embolisms like you see in the movies, although you may experience the Bends (this is when your blood boils). You'll also feel the spit on your tongue and sweat on your body boil away. It's described as a fizzy feeling, like drinking soda. Otherwise, you don't feel very much. Until you die of oxygen deprivation, that is. ( URL_0 )"
] | [
19
] | [
[
"http://curious.astro.cornell.edu/about-us/151-people-in-astronomy/space-exploration-and-astronauts/human-spaceflight-current-or-past/954-what-would-happen-if-you-took-off-your-helmet-in-space-beginner"
],
[],
[]
] | [
"url"
] | [
"url"
] |
|
m9zmf9 | How is audio transmitted from my phone to my wireless earphones? | I understand that both devices are equipped with Bluetooth modules, but how the sound is able to play instantaneously baffles me. | Technology | explainlikeimfive | [
"grpqawv"
] | [
"Fundamentally it is just a radio transmission of data from your phone to the earphones, but there is a reason it took years to go from radio sets to Bluetooth headphones. Those chips are doing a lot and the process is very layered. How do you account for all the other signals bouncing off walls etc? How do you encode the sound as data efficiently? What do you do if you lose a packet of data? How do you minimise the power usage so an earbud works for a whole day? And a bunch of other issues that all got solved and standardised one by one to produce what essentially seems like magic. But yeah, radio waves."
] | [
3
] | [
[]
] | [
"url"
] | [
"url"
] |
5vj2yd | Why do animals like to be pet by humans? | Biology | explainlikeimfive | [
"de2f7t5",
"de2iwcj",
"de2f8to",
"de2j00n",
"de2sc0j"
] | [
"Many mammals, especially the kind we interact with, are social creatures - the evolved to work in small family units to share in responsibilities like hunting, care for young, protection, and health. Part of health is grooming; keeping each other clean and free of disease. Petting is a form of grooming. Animals evolved to seek out grooming, as it is a social behavior beneficial to the survival of these animals."
] | [
32
] | [
[],
[],
[],
[],
[]
] | [
"url"
] | [
"url"
] |
|
6ykl43 | Are rocks our ancestors? (ie. how did life start?) | Biology | explainlikeimfive | [
"dmo3xv8"
] | [
"The exact process by which life started is a matter of conjecture, because it would be a long time (hundreds of millions of years) before any living creature evolved with something solid (like bones or a shell) enough to form a fossil. What we think happened is that certain important chemical precursors (like water, ammonia, methane, and hydrogen) came together under the right conditions (perhaps as the result of a lightening strike) which caused them to bond in a particular way. These conditions caused them to form self-replicating proteins. The best experiment into the subject, the [Miller-Urey experiment]( URL_0 ), was conducted back in the 50s. It turns out that a relatively few chemicals, under the right conditions, can form lots of organic precursors in a very short time."
] | [
3
] | [
[
"https://en.wikipedia.org/wiki/Miller%E2%80%93Urey_experiment"
]
] | [
"url"
] | [
"url"
] |
|
erab3y | Why do so many different illnesses display "flu-like" symptoms, rather than having unique symptoms, or otherwise different combinations of symptoms? | Biology | explainlikeimfive | [
"ff2isop",
"ff2iyvt"
] | [
"Because “flu-like” symptoms are simply indicators that your immune system is working to combat an intruder. It is the biological version of a “Busy” light. You might get other specific symptoms, but you’ll also get the non-specific response of fever, body aches and general fatigue."
] | [
37
] | [
[],
[]
] | [
"url"
] | [
"url"
] |
|
kww5hg | If hot air rises, why does an airline pilot say that 10000 feet into the air is freezing cold? | Earth Science | explainlikeimfive | [
"gj6p01i",
"gj6t8xk",
"gj7dy07",
"gj7lceb"
] | [
"The basic answer is that the farther away you get from the earth, the thinner the atmosphere gets. The total heat content of a system is directly related to the amount of matter present, so it is cooler at higher elevations."
] | [
12
] | [
[],
[],
[],
[]
] | [
"url"
] | [
"url"
] |
|
lvi852 | why we move our hands when we run/walk | Physics | explainlikeimfive | [
"gpc0dgz"
] | [
"In a word: balance. Try running with your arms locked by your sides, you will not feel as \"secure\" for lack of a better word."
] | [
15
] | [
[]
] | [
"url"
] | [
"url"
] |
|
fmm9pm | Why does the placebo effect have the power to create actual effects in our bodies? | Biology | explainlikeimfive | [
"fl4ze2j",
"fl59dzs"
] | [
"It all revolves around the power of our brains. Because our brains are capable of sending messages to the body, we can trick it into thinking we’re helping it. [Vsauce has a wonderful video about it]( URL_0 )"
] | [
7
] | [
[
"https://youtu.be/QDCcuCHOIyY"
],
[]
] | [
"url"
] | [
"url"
] |
|
6g7gqg | Why *one* side of the face is commonly affected by a stroke and not both sides. | Biology | explainlikeimfive | [
"dio2jwk"
] | [
"Different parts of the brain controls the different sides of your body. This is because our body is symmetric including the brain. A stroke on the other hand is not symmetric and only affects one area of your brain. And since the areas controlling your face muscles are on different hemispheres and therefore far apart it is very unlikely to have a single stroke affecting both areas at once. So a stroke on the left hemisphere might cause you to lose control over the facial muscles in the right side of the face but not the left."
] | [
6
] | [
[]
] | [
"url"
] | [
"url"
] |
|
6y14u0 | Why are most cop cars the same model? I know they switch the engines but what's so desirable about the car model itself? | Repost | explainlikeimfive | [
"dmjwb35",
"dmjw94c"
] | [
"They're \"fleet vehicles\". All built on a fairly bare chassis with not a lot of options and sold at a volume discount. And having the same make and model of vehicles means you don't have to keep various versions spares for a bunch of different accessories like light bars or laptop mounts."
] | [
4
] | [
[],
[]
] | [
"url"
] | [
"url"
] |
|
nucc6v | How do spam callers call you from fake numbers with area codes that are relevant to you? | Technology | explainlikeimfive | [
"h0wmpxw",
"h0wogc0"
] | [
"The phone system is intentionally set up to allow spoofing the number you're calling from. Imagine you've got a business with multiple office locations. Whenever someone makes an outbound call, you want the caller ID to show your businesses inbound number. This is why you can spoof caller ID. As for how they get relevant numbers, it's because of the information collected about you along with your number. They may, for instance, scrape Facebook for hometown info and full in area codes to match. These spreadsheets of information get sold and traded around many times."
] | [
3
] | [
[],
[]
] | [
"url"
] | [
"url"
] |
|
chvjsa | If an atomic warhead detonates while the missile is flying at 1,000 mph, do we get a nuclear explosion moving at 1,000 mph? | Physics | explainlikeimfive | [
"euyccuk"
] | [
"Yes and no. The amount of energy released by a nuclear weapon far outstrips the kinetic energy it had by flying at 1000mph. This really muddies any measurement you might make about the movement of the plume. Will you get a 1000mph flamethrower that carves out a wide swath of death and destruction? No. Will the body of the mushroom cloud continue with any momentum? No. The kinetic energy will be dispersed very quickly. Yes, technically, that kinetic energy is preserved, but it gets drowned out by the insane amount of heat released and scattered."
] | [
12
] | [
[]
] | [
"url"
] | [
"url"
] |