q_id stringlengths 6 6 | title stringlengths 3 299 | selftext stringlengths 0 4.44k | category stringclasses 9
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o9t58b | How do tattoos work? | Why won't the body reject the foreign object, 'ink'? | Biology | explainlikeimfive | {
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"It does, but it doesn't do it very well. Tattoo ink is placed between two different layers of skin. The dermis (the lower layer of skin) doesn't slough off like the epidermis does, so the ink remains there as new skin is produced. The body ... | [
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o9tdt0 | How did coffee come to become so popular in Scandinavian countries? | Other | explainlikeimfive | {
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"The Dutch East India Trading Company mainly. They established strong colonies in areas that could grow coffee in the 1600s and became the primary supplier to the region."
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o9tyx3 | Why do arm/leg hairs stop growing once they reach a certain length, yet other hairs continue to grow? | Biology | explainlikeimfive | {
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"They don't stop once they reach a certain length. They stop when they've been growing for a certain amount of time. Hair follicles have a cycle where they'll grow for x number of days, rest for y number of days, then start ag... | [
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o9us7n | --- Higher dimensions. just can't get my head around it. please. someone. | I have read the book Flatland so i get how there can be a higher dimension but I just can't comprehend it. If you have a way it can be visualised or even explained a lil bit, please tell me. Thankyou for your time! | Physics | explainlikeimfive | {
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"So presumably, you know at this point how a 3D sphere looks passing through a 2D universe, right? It starts off not existing, then it becomes a small circle, grows to a larger circ... | [
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o9vmlg | What is the benefit of added fluoride ? | Other | explainlikeimfive | {
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"Fluoride gets deposited on the surface of your teeth and makes them more resistant to the acids produced by bacteria in your mouth. (It also may directly slow the growth of the bacteria themselves; that's less certain.) That makes you less vulnerable to t... | [
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o9wlyj | How does suncreen work? | While it comes out of the bottle opaque it goes on transparent after being rubbed into skin. So how does a transparent oil actually block the sun's rays? | Chemistry | explainlikeimfive | {
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"To you it looks transparent, but so is uv radiation. Uv radiation is simply not visible to humans and the sunscreen reflects it. There are some cool videos on youtube where you can see through some special camera how the rays are reflected"... | [
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o9x95m | Are NFTs forever? | What happens when someone mints an NFT without having a right to the artwork for instance? In the case of an artwork by Basquiat I think the respective NFT was removed from the market. But what happens to the blockchain if errors like this occur? Can the information in the ledger be erased or changed and if so, how? | Technology | explainlikeimfive | {
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"> What happens when someone mints an NFT without having a right to the artwork for instance? Then they created an NFT and control it, until potentially selling it to someone else. The NFT does not confer ownership of the original work, just control of the hash of... som... | [
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o9xhou | Why is it bad for a plant to be root bound? | Biology | explainlikeimfive | {
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"Different plants have different needs. Some actually don't mind being \"root bound\" that much (having their pot fill up with roots) and actually can do better with it. Others really find it horrible. As an example, let's look at a cactus. Most are design... | [
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o9ylbl | Do animals tan? | OK, I know this sounds silly but I’m a ginger so when I tan I tan really hard on the top side but not at all on the bottom. It makes me think of the way that cheetahs and leopards are darker on the top then they are on the bottom. Do animals tan? Does fur make it so that they don’t tan? | Biology | explainlikeimfive | {
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"Animals can get sunburned like we do, pigs for example root in mud to cool off and because mud is a form of sun protection. Animals with fur cannot get sunburned where and when the fur covers them but can get burned on their lips and eyelid... | [
"url"
] | [
"url"
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o9yvnh | Do humans have a sense that is better than the rest? | Or is there no way to measure these sort of differences, this question is a bit sloppy sorry for confusion. | Biology | explainlikeimfive | {
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"Humans have no inherently powerful natural sensory organs, our sense of smell is inferior to dogs and our sense of sight is inferior to most birds. Our greatest natural advantage is our intelligence and ability to communicate complex information to each other."
],
"... | [
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o9yyjo | Why do we like to listen to sad music when we are sad? | Other | explainlikeimfive | {
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"h3e95j4"
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"text": [
"Because it makes you feel like others understand how you feel and your not the only one who has been through this before. And sometimes the song can explain how you feel better than anything else could."
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o9zdf7 | Why do sun beams that shine through cloudy skies appear to converge back to the sun, even though light rays from the sun are considered to be parallel? | This was a bonus question on one of my high school physics tests, and for the life of me I can’t remember the answer. It was a one-word answer the teacher was looking for... like “diffraction” or something, but that’s not it. 🤣 | Physics | explainlikeimfive | {
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"text": [
"Perspective. Parallel lines look like they're converging at the \"vanishing point\", aka infinity. The sun is so far away that it might as well be infinity as far as our eyeballs are concerned.",
"It’s the same effect you get standing b... | [
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o9zhhn | Why do surgeons leave the old kidney in the patient when transplanting a donor kidney? | Biology | explainlikeimfive | {
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"Removing it is additional work and risk that isn’t really useful unless the kidney is infected or something. Usually it’s fine and just not working, s... | [
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oa0se9 | Why do stickers curl when you peel them off of something? | Other | explainlikeimfive | {
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"When you peel off a sticker, you’re basically pulling on the top side while the bottom is still stuck. This lengthens the fibres on the bottom while the top ones are still in place. One longer side = curls! This also applies to when you curl a ribbon by running one side... | [
"url"
] | [
"url"
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oa248v | Why are splashes of warm water in the shower cold? | Clarification: If you stand next to a warm shower the splashes that come from the ground feel really cold on your skin. Why is that? | Other | explainlikeimfive | {
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"Because the water bounces on a cold surface, floor or side of the shower, losing temperature in the process, so when it touches you again it feels colder because it is. Our skin is sensitive so even a few degrees can make the difference between cold an warm"
],
"sco... | [
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oa2woh | Why does alcohol hit quicker than THC edibles | Both are eaten but alcohol’s effects can come on quickly where THC edibles take 45+ mins to kick in. Why? | Biology | explainlikeimfive | {
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"text": [
"My understanding is this: Alcohol (ethanol) is freely floating about in the water (like the rest of the \"drink stuff\") and is loosely connected to the mix. THC is much more firmly packed in with the \"food stuff.\" Water (and basically ev... | [
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oa342z | What is the difference between a power chord and a regular chord in guitars? | I am trying to differentiate the two but do not understand the music theory jargon explaining the two. | Other | explainlikeimfive | {
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"text": [
"C Major chord has the notes C - E - G. C minor chord has the notes C - E flat - G As you can see, the note that distinguishes the two chords is that differing middle note. And a power chord is missing that middle note, so it ... | [
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oa4w76 | Why does nature like square roots and cube numers? | Late bloomer when it comes to physics here but I wonder why nature is first of all describable in such a precise way with numers and letters and why nature even "obeys" to square roots and cube numbers. Take for example Newton's law of universal gravitation: F=GMm/R² As far as I know, the idea of square roots and cube ... | Physics | explainlikeimfive | {
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"text": [
"The answer is dimensions. Things that scale in two or three dimensions tend to use square and cube numbers respectively. To take the law of universal gravitation as an example - when talking about gravity, you have a massive object with a n... | [
"url"
] | [
"url"
] |
oa556e | How Do Military IR cameras work? | How do those cameras manage to show you a clear picture opposed to heat cameras one can use to get to know where insulation on house for example is leaking? | Physics | explainlikeimfive | {
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"text": [
"You are comparing thermal IR vs near IR. Military use both. The thermal cameras have higher resolution and accuracy result in higher cost and larger size. We talk about 100x the cost of a phone thermal IR camera Military thermal cameras are what is common... | [
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] | [
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oa5wui | Why does an increased demand for a product automatically increase the price of it, do companies do this or is it just something that happens? | Economics | explainlikeimfive | {
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"text": [
"An increased demand for something doesn’t automatically raise prices. Generally it leads to increased production. However it can lead to higher prices... | [
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oa66kd | Mafia “no shows” & “no jobs” | ELI5 Watching The Sopranos, they talk about job’s which include “no shows” & “no jobs”. What actually are they? I just don’t understand it. | Other | explainlikeimfive | {
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"A no show is a job where you do not have to show up to get paid. At the end of the week there is a pay cheque waiting for you. A no work is where you have to be there, some of the time at least, but don't have to do any work. Chrissy had a no show job. So he got paid de... | [
"url"
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oa6gea | The constant forward force of Windows updates has me wondering: Why do some PC games work on Linux and not others. | And, why still do some games work via Proton and Steam Play even when they aren't designed to, albeit with graphical hiccups and performance issues? It seems to have little to do with the age of the games as well. | Technology | explainlikeimfive | {
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"Let's think of operating systems as human languages. You write a book in English and you want a Swahili speaker to read it. What do you do? Translate the book to Swahili. This is analogous to game available to both Linux and Windows. What a... | [
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oa6s7v | Why do companies keep releasing subscription services? | Other | explainlikeimfive | {
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"A reoccurring problem in a lot of ways is that companies do things if they think it will make them specifically money, they don't care if they make everything else in the world worse by doing it. Some streaming... | [
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] | [
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oa6v0i | How does granite work as a coating for nonstick pans? | Chemistry | explainlikeimfive | {
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"text": [
"You know that is a marketing term? The pots aren't actual rock..."
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oa7qb1 | How does light have momentum if photons have no mass? Momentum is mass times the acceleration (p=mv), so something with no mass should have zero momentum. | Physics | explainlikeimfive | {
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"text": [
"Well because p=mv isnt the only way to describe momentum. De Broglie said that p=h/lambda, with lambda be... | [
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oa85ed | What determines whether a hard boiled egg is easy to peel or not? | Biology | explainlikeimfive | {
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"h3g5int"
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"text": [
"There is a thin membrane between the shell and the albumen (egg white). This membrane is clingy and easily sticks to the white. As the egg gets older this membrane breaks down. Tldr: Don't boil fresh eggs. Use older ones. Edit: Also, peel them ASAP. You want to peel egg... | [
"url"
] | [
"url"
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oa96nc | What makes up a photon? | Physics | explainlikeimfive | {
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"text": [
"Hi /u/DumbBurnerAccount69! > When I say makes up, I have in my mind that protons, neutron, and electrons are all made up of quarks; subatomic particles. According to the [standard model]( URL_1 ), only [hadrons]( URL_3 ) like protons and neutrons are made up of quarks. ... | [
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] | [
"url"
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oaaqfc | How does noise cancellation software work? | Hi, you have noise cancellation apps on laptops like Krisp. I'm curious about how they work. I know about Active Noise Cancellation on headphones and how it works, but could the same be achieved by this software. And how does the app know which part of the sound wave is noise and which is useful audio? | Technology | explainlikeimfive | {
"a_id": [
"h3g7gal"
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"text": [
"So there are microphones on the outside listening to what's around you. Sound waves behave like other waves, if two of equal and opposite size meet, they interfere with each other and cancel each other down to zero. So the software listens to the environment around you,... | [
"url"
] | [
"url"
] |
oabxz7 | Can trees die of 'old age', and if so, what exactly happens with them? | I feel like they always tell you about how insanely old trees can grow, but can they die of 'natural causes' even? | Biology | explainlikeimfive | {
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"text": [
"We really don't understand aging in trees that well. We think all trees will die eventually, but we don't know for sure what is happening physiologically to them that results in that. Most trees due to accumulative damage to the tree. Most trees only the ... | [
"url"
] | [
"url"
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oacein | How was the first TV made? | When I think about how TVs work now, it seems to make much more sense than when I think about how the first one was made, and even how the idea of them was conceived. How did the inventor(s) know that X could lead to Y and Z? How did they coordinate all the audiovisuals? | Technology | explainlikeimfive | {
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"text": [
"An invention like the TV sounds like it had to have been made deliberately, but in reality, for the most part, these things end up with someone wanting to do something, and looking for what parts they know they might need, an... | [
"url"
] | [
"url"
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oadyi4 | why do big companies pay huge money to designers for their logo? | Even more when the designer makes very little changes. What do these big "designers" do better than maybe an art student who can do the same job for very cheap? | Economics | explainlikeimfive | {
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"text": [
"Usually, big companies will go to design studios, and they’ll pay a lot of money for their branding. The branding consists of more than just a logo, it involves strategy, voice and writing, assets like fonts and patterns, and sometimes social media guidan... | [
"url"
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"url"
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oafo51 | How does color arise? | If light is nothing but photons, which behave like particles and all move at the same speed (I’m assuming, I could be wrong), how does color arise out of that and what causes different wavelengths of light if light is just a group of particles | Physics | explainlikeimfive | {
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"text": [
"You can think of photons as like little packets of waves, while they act like particles they still have a frequency and wavelength. Each individual photon carries this frequency information, and the energy of the photon depends on what the frequency is.",... | [
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oaftay | Why is every staple crop around the world some kind of starch (wheat, rice, potatoes, maize, ect..)? | Other | explainlikeimfive | {
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"text": [
"Starch is a complex carbohydrate which means that it is broken down into sugar by the body. So it's a source of energy. That's what makes these staple crops, they are grown because they are an efficient source of food energy.... | [
"url"
] | [
"url"
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oafxvi | Heat waves | I live in Arizona so +110 degrees is pretty normal for summer. But just this week places like Seattle and even Vancouver broke 100 degrees. So what causes the temperature to spike so much in certain areas? And why are heat waves in hot places seemingly non-existant? AZ summers can easily reach 120, but there's never be... | Earth Science | explainlikeimfive | {
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"h3h89db"
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"text": [
"You know the thing that scientists tend to yap on about regarding some sort of global climate change. It turns out that heating the planet up just a couple of degrees causes things like jet winds to move around like crazy. Events that previously were rare like polar win... | [
"url"
] | [
"url"
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oagt8c | There are tons of phone messages (calls texts etc.) going through the airways at any time, how does your phone pick out the specific signal coming to it and how is there no interference from other signals? | Technology | explainlikeimfive | {
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"This is probably the biggest problem that thousands of engineers have been working on the last few decades, with the resulting improvement from GSM connections to incredibly slow internet, to 1GBps on 5G. There... | [
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oah5qu | how does inflation work | Economics | explainlikeimfive | {
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"h3hfbf8"
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"text": [
"Inflation is still not totally understood by economists, and there is a ton more research to do but here is the ELI5. Over time, the world makes more and more money from people going to work (in reality money creation is made from debt but idk if a 5 yr old is ready for... | [
"url"
] | [
"url"
] | |
oah68p | How can we stream HDTV through a service like directtv with no problems but satellite internet is often slow and a horrible delay making it basically worthless? | Technology | explainlikeimfive | {
"a_id": [
"h3hfv2y",
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"text": [
"When you have the HD movie coming your way, you aren't able to detect the latency, being the time it takes for the signal to travel from the ground to space and back down to you. You just detect the incoming stream, and show it as it flows in, like if you... | [
"url"
] | [
"url"
] | |
oah6g6 | What's actually happening in your head when you have a headache? | Is it different for different causes (dehydrations, stress, pressure, etc.)? | Biology | explainlikeimfive | {
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"h3hqkty"
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"text": [
"Ok. The actual answer is, \"We don't know. It's still one of those mysteries.\" There are ideas on what might be happening. It may be pain from muscles in the shoulders, neck and head. It may be caused by dilating blood vessels in the head. It may be caused by the membr... | [
"url"
] | [
"url"
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oaj4hw | How are non-alcoholic beers and wines made? | Chemistry | explainlikeimfive | {
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"h3ivg93"
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"text": [
"There are four primary approaches to making a non-alcoholic beer. Wine may undergo similar processes, though my experience is that many NA wines are just verjus. Dealcoholization — Full-strength beer is produced, and then the alcohol is removed and replaced with water. ... | [
"url"
] | [
"url"
] | |
oajx6b | Why is Death Valley hotter than the Sahara desert even though the Sahara is larger and closer to the equator? | Earth Science | explainlikeimfive | {
"a_id": [
"h3hx6zg"
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"text": [
"Death Valley is a valley, not a flat region of sand. This traps air and greatly reduces surface winds at high temps. No wind allows temps to get even hotter."
],
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oakpzp | Why is Every Call Now About Extended Car Warranty? | Economics | explainlikeimfive | {
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"h3i37bj"
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"text": [
"i have been getting four or five of these a week for a year and a half now. i have blocked hundreds of numbers. i can't wait until they bust these guys"
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3
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oaktmo | why can’t they make a quiet MRI machine? | Other | explainlikeimfive | {
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"h3i9xa6",
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"text": [
"The forces involved inside an MRI machine are \\*enormous\\*. Part of the MRI scanner is a ludicrously powerful magnet, and another part creates a very rapidly changing electromagnetic field...the combination causes enormous forces & stress on the coils i... | [
"url"
] | [
"url"
] | |
oaktov | In TV & movies, how do they sync up the animation with the music? | This seems so hard. In reading stuff about The Simpsons, they write the episodes, then the impression I get is that they send it to Korea for animation, and like 8 months later, the animation is done. Where does the music come in? In watching tons of animated stuff with my young kids, I'm still amazed and can't figure ... | Technology | explainlikeimfive | {
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"text": [
"Whoever is directing the animation chooses people to write music, create sound effects, and of course voice characters. This is generally done in a series of meetings very early on in the process. Voice acting happens before the animators start key framing in most cases... | [
"url"
] | [
"url"
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oal1qq | What is physically making the sound that comes out of a speaker? | Technology | explainlikeimfive | {
"a_id": [
"h3i4l66"
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"text": [
"The surface of the speaker that you see, if you take the mesh cover off, is what is physically making the sound. A coil and magnets push the front of the speaker back and forth and that creates sound waves you can hear. Picture your hand in the water and you push it for... | [
"url"
] | [
"url"
] | |
oal2iy | Why do "Homeowners Associations" have so much power? (ELI a non-US 5 year-old) | Other | explainlikeimfive | {
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"h3i52yg",
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"text": [
"They have so much power because the homeowners agreed to it when they bought the house. You are not forced or required to buy a home that is part of an HOA it is a choice. My own home is private.",
"When you buy or rent a house from a new development ... | [
"url"
] | [
"url"
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oamshy | What's the difference between singing, rap, and poetry? | Other | explainlikeimfive | {
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"text": [
"poetry is a genre of literary work: you cannot “poetry” in the same way you can “sing” or “dance”. Poems can be spoken (take any recitation as an example of that) or sung (most songs by Schubert and the like). Singing and rapping are both forms of musical... | [
"url"
] | [
"url"
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oamt0n | why are water boilers much faster at boiling water than a pot on the stove? | Physics | explainlikeimfive | {
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"h3ig4vy",
"h3ihpcz",
"h3ik2yh"
],
"text": [
"The heating element is in much better contact with the water than in a pot on the stove. The pot sits on a rack suspended above a burner, or touching part of the heating coil. That's much less efficient than having the water directly in con... | [
"url"
] | [
"url"
] | |
oao3u6 | What causes heat lightning? | Physics | explainlikeimfive | {
"a_id": [
"h3ip9jb"
],
"text": [
"Answer: Heat lightning isn't actually a thing. Its just caused by distant thunderstorms that are too far away to hear the thunder. Source - Spent most of my life believing it was a thing until a local weatherman corrected me on a field trip"
],
"score": [
10
]... | [
"url"
] | [
"url"
] | |
oaog3b | Why venus change colour near earth horizon?? | Last night I was watching venus after sunset around 8 pm it was somewhat sparkling white in colour but , as it was about to set after some time its colour became somewhat red. How did that happen ?? | Physics | explainlikeimfive | {
"a_id": [
"h3ir87j"
],
"text": [
"Same reason the sun turns red as its setting. Near the horizon, light from space has to go through a lot more atmosphere to get to you. The atmosphere is better at scattering short wavelength light than long wavelength. You can kind of think of short wavelength lights (... | [
"url"
] | [
"url"
] |
oaosoy | - why does smoking weed give intense panic attacks where you are so convinced you are dying? | Biology | explainlikeimfive | {
"a_id": [
"h3itssd",
"h3ivni6",
"h3it1lb",
"h3iurra",
"h3iuhnj",
"h3iwr8o",
"h3j1udh"
],
"text": [
"Research shows that if you smoke marijuana with higher concentrations of THC (the chemical that makes you high) it can stimulate the amygdala or \"fear center\" of your brain. So a... | [
"url"
] | [
"url"
] | |
oap9fp | Why we can't feel or notice the earth moving even if it moves extremely fast | Title | Physics | explainlikeimfive | {
"a_id": [
"h3ivzsc",
"h3j5qhr",
"h3iwt7h"
],
"text": [
"When it comes to physics, you can only feel acceleration, not motion. The earth is moving at a constant speed, there for we cannot feel it as we are not accelerating nor decelerating.",
"Saying that something is moving fast does not rea... | [
"url"
] | [
"url"
] |
oapou4 | What is the purpose of lactic acid and what is its purpose | Biology | explainlikeimfive | {
"a_id": [
"h3iys4i"
],
"text": [
"Lactic acid is formed when your body doesn't have enough oxygen to create energy by normal means. If I'm walking down the street, my muscles are receiving oxygen and I'm not using them that hard. This allows my body to break down my food using oxygen as it normally does... | [
"url"
] | [
"url"
] | |
oaqxcd | how does UV light work to cure gel nail polish? And why is it specifically the UV spectrum? | Chemistry | explainlikeimfive | {
"a_id": [
"h3j8w2u"
],
"text": [
"This is a hard one to eli5, but I'll try. Living cells generate some really cool, really large, and really complex molecules and we've been playing around with them for a long time now. We learned that a certain combination of molecules can lock together when thoroughly... | [
"url"
] | [
"url"
] | |
oavllw | Whats the difference between "fire" and "to go" in line kitchens? | Other | explainlikeimfive | {
"a_id": [
"h3juoly"
],
"text": [
"Doesn’t fire mean to cook it and to go is pack it to go?"
],
"score": [
7
],
"text_urls": [
[]
]
} | [
"url"
] | [
"url"
] | |
oawth4 | Why can't we convert greenhouse gases into another gas that doesn't trap heat? | Chemistry | explainlikeimfive | {
"a_id": [
"h3k1l1o",
"h3kgs86",
"h3k0q9t",
"h3kwu82",
"h3k5rc8",
"h3kxhyr",
"h3k20v6",
"h3lda5p",
"h3lc2dy",
"h3leyv2",
"h3k3wxx",
"h3luhv9",
"h3kl85g",
"h3lj25k",
"h3l3d38",
"h3lxrtr",
"h3lhc0p"
],
"text": [
"CO2 is a very low-energy molec... | [
"url"
] | [
"url"
] | |
oax9fl | Why is there sound when a flame is blown by air? | Other | explainlikeimfive | {
"a_id": [
"h3k36vq",
"h3kqkkd",
"h3k3jzj",
"h3l3df9"
],
"text": [
"Cold air that comes in contact with a flame will produce a sound because the air rapidly expands.",
"The rapid heating and expansion of cool air creates sound. This is why lightning produces thunder, as the sudden (massiv... | [
"url"
] | [
"url"
] | |
oaxnrt | If a child is born premature, is his or her bone age going to be older or younger than chronological age? | Biology | explainlikeimfive | {
"a_id": [
"h3k7etu"
],
"text": [
"So, it is possible that compared to their birth date age their bones may be slightly less developed then a typical child of that age, since they were less developed coming out of the womb. But, it’s only really at most a few months of missed development, so by the time ... | [
"url"
] | [
"url"
] | |
oayewd | how do crabs living in the sand not get crushed when humans walk on top of them? | I saw a gif on the home page with a man sifting a ton of small crabs out of sand on the shore (at the water’s edge). After only finding info about crabs at the bottom of the ocean withstanding extreme pressure, or hiding in rocky tide pools, I want to know how the crabs on (in?) land survive as humans walk over their h... | Earth Science | explainlikeimfive | {
"a_id": [
"h3kcg6z",
"h3kclbh",
"h3kdma8"
],
"text": [
"Three reasons working together in conjunction: 1. Crabs are small. Burrowing crabs are particularly small. Since your strength depends on the square-cube law, it means crabs are relatively strong. 2. Crabs are built to live underwater. They... | [
"url"
] | [
"url"
] |
oazres | Why is carbon not a diatomic molecule? | It seems that carbon, if 2 of them bond covalently, that there would be a full valence shell. Similar to oxygen or fluorine. So why does C2 not occur? | Chemistry | explainlikeimfive | {
"a_id": [
"h3kluer",
"h3kl6m4"
],
"text": [
"The way the bonds work is not only the question of the numbers filling a valence shell. The electron orbitals have a geometry to them. You can perhaps think of it as two shapes \"sharing\" a face. The shapes of the orbitals of the carbon atom don't \"allo... | [
"url"
] | [
"url"
] |
oazv4s | How can geometry produce vibrations or vibrations produce geometry? | I've seen some videos of a vibrating table with sand on top and trying diffrrent frequencies like 400hz, 700hz and the sand makes some geometric patterns. | Physics | explainlikeimfive | {
"a_id": [
"h3kp46n",
"h3kpf0o"
],
"text": [
"the sheet vibrates in what is called \"eigenmodes\". it wobbles more or less like a two-dimensional spring system. Some locations are near rest, called \"nodes\", and this is where the sand accumulates. The eigenmodes (and thus node structure) depends on ... | [
"url"
] | [
"url"
] |
oazwie | Why are icy surfaces sticky ? | Chemistry | explainlikeimfive | {
"a_id": [
"h3kr7mb"
],
"text": [
"Your skin has a bit of water on it. When you touch the surface it freezes quickly and your skin is stuck to it. The layer is so thin you can usually just pull your hand off of it to break the ice."
],
"score": [
4
],
"text_urls": [
[]
]
} | [
"url"
] | [
"url"
] | |
ob0kor | How come every element on the periodic table (which we know doesn't have any holes) is found on earth (except higher unstable elements)? | Earth Science | explainlikeimfive | {
"a_id": [
"h3lj4y9",
"h3kqq8z",
"h3kqxbc",
"h3kzetb",
"h3lkcso",
"h3lnmf9",
"h3lm70t",
"h3ln05t",
"h3lf0oc",
"h3mbf35",
"h3lrisx",
"h3me6xf",
"h3lm11q",
"h3luixj"
],
"text": [
"So the three lightest elements (hydrogen, helium, and lithium) are what we ... | [
"url"
] | [
"url"
] | |
ob1ce2 | Why are there magnetic field *lines*? | I've seen images of ferrofluid and iron filings that will point or align along field lines. However I don't understand why there are separate lines and not just a homogenous field. Why are there quantized lines? | Physics | explainlikeimfive | {
"a_id": [
"h3l0iqk",
"h3l0pr3"
],
"text": [
"Magnetic fields lines are like contour lines to show height on a map. They are a way to visualise the varying magnetic field strength or height. There aren't actual lines. But, if you put iron filings down then they will point in the direction of the fiel... | [
"url"
] | [
"url"
] |
ob1jur | What is “the three body problem” and why is there no solution or answer for it? | Physics | explainlikeimfive | {
"a_id": [
"h3kxpo7",
"h3kzz8z",
"h3ldncj",
"h3kxeof"
],
"text": [
"The three body problem are just three bodies (planets or stars for example) of similar weight (so you can't just ignore one) interaction with each other through gravity (orbiting each other) It can't be solved because they ca... | [
"url"
] | [
"url"
] | |
ob2ibp | When a contraceptive says it's 99% effective, what dose that mean? For every 100 times you have sex during conditions where pregnancy would otherwise be likely, the contraceptive will fail on average once? Seems like for a normal active sex life 1 out of 100 shags is really bad odds. | Title says it all. | Biology | explainlikeimfive | {
"a_id": [
"h3l54yz",
"h3l4x5s",
"h3l3i8f",
"h3l4959"
],
"text": [
"It's the percentage of couples who would get pregnant using that method of birth control Vs the amount of couples who would get pregnant with no birth control. So if 10,000 couples used no birth control and 100 got pregnant, ... | [
"url"
] | [
"url"
] |
ob2pf8 | The transition from life underwater to life on earth. How did it happen? Did some lifeform lay eggs on land and the babies could live on land but the parent didn't? | Biology | explainlikeimfive | {
"a_id": [
"h3l70gz",
"h3l664n",
"h3l75aj"
],
"text": [
"It was a gradual evolution. The last remaining evolutionary branch of fish on the path to become land animals is the lungfish. It is able to both breathe under water and breathe air through two separate organs. At first it was probably an a... | [
"url"
] | [
"url"
] | |
ob38hc | What is the difference between an impression and an edition for a book? | I’ve recently picked up a book that’s an “8th impression,” and I understand it’s related in some way to editions but I’m not quite sure how. | Other | explainlikeimfive | {
"a_id": [
"h3l84vh"
],
"text": [
"An edition is after the manuscript is edited. Basically if changes are made to the text. Spelling corrections, grammer, rewrites etc. An impression is a reprinting of the same edition. So if you got a book from the 4th time they printed the 3rd edition it would be the 4... | [
"url"
] | [
"url"
] |
ob5gqn | Why is the "Wow! signal" so significant? | Physics | explainlikeimfive | {
"a_id": [
"h3lp0gw"
],
"text": [
"As part of SETI (Search for Extraterrestrial Intelligence), some scientists had radio telescopes listening for signals around a certain frequency, which they speculated might be used by aliens trying to contact us. Let's look at [this image]( URL_0 ) of the Wow! signal ... | [
"url"
] | [
"url"
] | |
ob72hc | Why does table salt contain dextrose? Isn’t that a different form of sugar? | Every time I buy table salt I have observed that the ingredients have Sodium Chloride, Dextrose, Potassium Iodide and either Yellow Prussiate of soda (whatever that means) or some other additive. What my brain can’t wrap around is the fact that there is sugar in my salt? Is the quantity so less that it would not genera... | Chemistry | explainlikeimfive | {
"a_id": [
"h3lyjf7"
],
"text": [
"Dextrose is added to iodized salt primarily because it's a cheap and effective stabilizer for potassium iodide. Over time, the potassium iodide added to iodized salt tends to break apart into potassium and iodine, which reduces its effectiveness in the body. A stabilize... | [
"url"
] | [
"url"
] |
ob745d | How do Animal Pelts not Shed? | I was wondering, if animals shed their fur, how does it not shed after they are dead and skinned? Is it like hair follicle rigor mortis or something? | Other | explainlikeimfive | {
"a_id": [
"h3ly6wg"
],
"text": [
"Shedding is a sign of life, animals shed hair, and new hairs take their place. Once the animal is dead and the pelt is treated, the hairs are fixed in place."
],
"score": [
24
],
"text_urls": [
[]
]
} | [
"url"
] | [
"url"
] |
ob7hh5 | - Skin cancer. | What exactly is a melanoma and why are they so deadly if untreated? Why is fair skin so prone to skin cancer? | Biology | explainlikeimfive | {
"a_id": [
"h3m3q4x"
],
"text": [
"Melanoma is just one type of skin cancer, other types are basal cell carcinoma and squamous cell carcinoma Melanoma is uncontrolled growth (cancer) of cells in your skin called melanocytes Those are the cells that produce melanin, aka pigment, aka skin color The way UV ... | [
"url"
] | [
"url"
] |
ob9oe1 | Are Index's just lists/sub sections of the market or are they more than that? It confuses me when people say it's to measure the market.. if that's so can someone explain it to me? Thanks | Economics | explainlikeimfive | {
"a_id": [
"h3mfmrt"
],
"text": [
"Indexes in a way are yes just lists of companies on the market combined together, really well known ones include the Dow or S & P. This is why you hear about companies being added/removed from these indexes. These typically have a wide variety of companies on them, whic... | [
"url"
] | [
"url"
] |
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