title stringlengths 4 300 | selftext stringlengths 0 9.63k | answers.text stringlengths 55 11.4k | answers.score int64 2 32.7k | title_urls.url list | selftext_urls.url list | answers_urls.url list | sent_vec list |
|---|---|---|---|---|---|---|---|
does eating lactose while lactose intolerant have cumulative negative effects? | does the intolerance have long term effects, if the immediate symptoms are ignored? | enters the intestine, lactose, intestinal flora ====== the lactose itself does nothing in people with lactose intolerance, they just can't digest it. the bacteria that feast on the undigested lactose that enters the intestine cause the problem. if you don't eat lactose for a longer period you'll have less lactose-consu... | 16 | [] | [] | [] | [
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why do mirrors reflect light? | i believe i learned once before in school but i seem to have forgotten. it has been boggling my mind for the past week or so. | object reflects light, enters our eye, reflected light ====== every object reflects light; it is this reflected light that enters our eye and allows us to see the object. mirrors are special in that they reflect nearly all the wavelengths (colors), and the substance doing the reflecting is very smooth on a molecular sc... | 3 | [] | [] | [
"http://www.amazon.com/QED-Strange-Princeton-Science-Library/dp/0691125759",
"http://lesswrong.com/lw/pk/feynman_paths/"
] | [
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is there definitive scientific evidence that the universe is, in fact, infinitely expanding? | hope it's not a dumb question. | clear evidence, accelerating, heat death ====== there's clear evidence that the expansion is happening and that it's accelerating. if we assume this will keep going then eventually all galaxies become isolated from each other and something like a [heat death](_url_0_) occurs. but no one knows if the expansion will keep... | 5 | [] | [] | [
"http://en.m.wikipedia.org/wiki/Heat_death_of_the_universe"
] | [
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do fish smell like the sea, or does the sea smell like fish? | distinctive smell, separate smell, sea ====== the sea has a distinctive smell in different locations in the world, but fish have their own separate smell, not the same as the sea. speaking as a [circumnavigator](_url_0_). | 2 | [] | [] | [
"http://arachnoid.com/sailbook"
] | [
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would the impact of a very big meteor like the one causing the dinosaurs extinction be noticeable around the world? | shock wave circled, tnt equivalent., equivalent. by comparison ====== the impact that killed the dinosaurs was estimated to be around 100 *million megatons* tnt equivalent. by comparison, the tsar bomba was 50 megatons and the shock wave circled the world 2-3 times, detectable by standard instrumentation. the sheer amo... | 15 | [] | [] | [] | [
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so how do nuts have fat? i mean, fat is a somewhat complex molecule that animals use. what is a plant doing with them? | this is just something i've always wondered. it doesn't make sense to me. | room temperature, room, cell signaling molecules ====== plants have plenty of lipid molecules, just like like animals. they serve as a compact form of energy storage, in addition to parts of some essential cell components such as plasma membranes and the basis for some cell signaling molecules such as steroids. as a ru... | 16 | [] | [] | [
"http://en.wikipedia.org/wiki/Cocoa_butter"
] | [
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why is it that some craters, notably on the moon, have a small elevation in the centre/point of impact? | i've read that the central uplifts are due to gravity but i don't understand the role of gravity there. | rock, url, impact produces ====== i think [tycho](_url_2_), a young crater on the moon, is a good example of this. what is going on is that a large impact produces enormous pressure, well above the ultimate compressive strength of the rock. as a result, the rock behaves as a fluid, and you get dynamics similar to [drop... | 10 | [] | [] | [
"http://lroc.sese.asu.edu/news/uploads/LROCiotw/bullialdus.png",
"http://cosmoquest.org/x/explore/files/2014/02/600px-Moon_SimpleCrater.jpg",
"https://en.wikipedia.org/wiki/Tycho_(crater\\)#/media/File:Tycho_LRO.png",
"https://www.youtube.com/watch?v=NF8aQHwcKN0",
"http://www.impact-structures.com/wp-conten... | [
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if matter is never created or destroyed, that would mean that there is a set amount of matter, right? but the universe is infinite. how? | amount of mass-energy, created or destroyed, fixed amount ====== there is a fixed amount of mass-energy - matter can become energy and energy can become matter, but none can be created or destroyed. the observable universe is not infinite, and since we can't "see" anything past the edge of the observable universe (ther... | 7 | [] | [] | [
"https://en.wikipedia.org/wiki/Stress%E2%80%93energy_tensor"
] | [
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does data stored on a computer or flash drive have weight? | i know we aren't going to be able to feel the difference between a tb and a kb, but is there a difference on a molecular level. or is it all energy and has no weight. | similar thread, sets, thread ====== as i mentioned in another similar thread, imagine that you have two sets of eight coins. one of the sets is all heads (hhhhhhhh) while the other is (htththht), representing the number 105. do the two sets of coins weigh any differently? | 3 | [] | [] | [] | [
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why are cold beverages generally preferred over regular beverages? (i.e. cold coke is better than warm coke) | this never dawned on me until yesterday. is there any reason to this? | times before., western culture, remember the consensus ====== this question has been asked [many times before.](_url_0_) from what i remember the consensus is that the preference for cold drinks is mostly just a peculiarity of western culture. | 5 | [] | [] | [
"http://www.reddit.com/r/askscience/search?q=cold+drink&restrict_sr=on"
] | [
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if looking at an angled galaxy, like andromeda, through a telescope, is the light from the far end of the galaxy 200,000 years or so older that the front end? | [andromeda galaxy](_url_0_) if so, is the shape of the actual galaxy different from what we see? | andromeda, image of andromeda, perception of andromeda ====== yes, but not by very much. the the closer part of the galaxy is a more recent image of what's going on in that particular region of andromeda, while the far side is an older one. this gives a slightly skewed or warped perception of the state of the galaxy as... | 10 | [] | [
"https://upload.wikimedia.org/wikipedia/commons/9/98/Andromeda_Galaxy_%28with_h-alpha%29.jpg"
] | [] | [
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if our skin regenerates every 27 days, then how do tattoos last a lifetime? | top layer, top, regenerates ====== tattoos only need to be 2-3 layers deep...only our top layer of skin really 'regenerates'. when a fresh tattoo heals, the top layer peels off like a sunburn, & the ink stays underneath. we can't get ink to stay in that thin top layer, because it sheds off. feet & hands have more layer... | 10 | [] | [] | [] | [
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wouldn't pesticides have to be non-water soluble to resist rain? if so, what is the point of washing fruit and vegetables before eating them? | poison people, directly on food, supposed to resist ====== pesticides used directly on food crops are not supposed to resist rain, at least not to the extent that they persist and poison people. pesticides are often washed away by rain which is often part of the guidelines for use - rain can shorten the preharvest inte... | 6 | [] | [] | [] | [
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how is light pulled toward black holes if photons have no mass? | gravity, masses, interaction ====== because gravity isn't an interaction between two masses. classically it is, but that's because newtonian gravity is a low energy approximation to general relativity. gravity is actually an interaction between various things (including mass) and *spacetime*; since light travels throug... | 10 | [] | [] | [] | [
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despite the both being governed by inverse square laws, why are planetary orbits elliptical but atomic orbits are circular (in the classical model)? | classical electrons orbit, classical model, electrons ====== the people who developed the classical model didn't exactly know how the electrons were moving around. they just noticed that the electrons were moving around the nucleus *somehow*. the development of the classical model was an extrapolation that fit with the... | 7 | [] | [] | [
"http://en.wikipedia.org/wiki/File:Sommerfeld_ellipses.svg"
] | [
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can there be two planets close enough that they share a moon in a figure 8 pattern around both bodies? | switch orbits, sort, figure ====== sort of. it wouldn't exactly be a figure 8 pattern because the planets would be orbiting each other, so the moon could only switch orbits during certain alignments of the three bodies. more likely, you would have two stars with a planet that switches orbits between them. | 7 | [] | [] | [] | [
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if global warming ramps up c02 in the atmosphere, wouldn't that potentially cause plants to grow bigger and faster as it got worse? | i could be completely wrong in my understanding, but from what i assume we are really just worried about our liveable conditions in the environment. when plant life will, like they always have, thrive on warmer temperatures and increased c02 in the atmosphere. it could eventually pan out that we will find it difficult ... | limiting nutrient, significant short-term improvement, climate change ====== one might *expect* plants to do better in higher co2 concentrations, but realistically only plants where co2 is the limiting nutrient will have any significant short-term improvement due to increasing co2 levels. and while this question is ong... | 5 | [] | [] | [] | [
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if our universe is expanding at certain rate which started at the time of the big bang approx 13.8 billion lightyears ago with current radius of 46.6 billion lightyears, what is causing this expansion? | consider this as a follow-up question to /r/askscience/comments/5omsce/if_we_cannot_receive_light_from_objects_more_than posted by /u/codereaper regarding expansion of the universe. best example that i've had so far are expansion of bread dough and expansion of the balloon w.r.t. how objects are moving away from each o... | universe, ball, air ====== good question. here's an analogy. imagine you throw a ball in the air - really, really hard. after the ball leaves your hand, it is moving up in the air. now, if someone looks over and sees this ball flying up in the air they might ask "how is that ball flying through the air on its own!?!?" ... | 581 | [] | [] | [
"http://www.nat.vu.nl/~wimu/Varying-Constants-Pictures/Time-Scale-Universe.jpg"
] | [
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how much carbon dioxide is stored in leaves, then released back into the atmosphere through decay each year? | monitoring station data, carbon fluctuates seasonally, station data ====== you can see how much atmospheric carbon fluctuates seasonally by looking at monitoring station data, such as [these data from noaa](_url_1_). the red curve is the mean measurement from their obervation stations. as you can see, it peaks every ye... | 4 | [] | [] | [
"https://cdiac.ess-dive.lbl.gov/pns/convert.html",
"https://www.esrl.noaa.gov/gmd/ccgg/trends/global.html",
"https://en.wikipedia.org/wiki/Plant_senescence"
] | [
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why does cyanide kill you so quickly? | hitler and many other german officials committed suicide near the end of wwii using cyanide pill which they administered to themselves by breaking the pill with their teeth and swallowing the cyanide. they died almost instantaneously. why? doesn't your stomach have to process it first? what about stomach acids? or am i... | oxygen utilisation, inhaled, intracellular oxygen utilisation ====== cyanide can be ingested, inhaled, or absorbed through the skin. it acts by blocking the cytochrome c oxidase enzyme which is an essential part of intracellular oxygen utilisation. what this means is that the cells can no longer use oxygen at a tissue ... | 51 | [] | [] | [
"http://en.wikipedia.org/wiki/Death_of_Adolf_Hitler"
] | [
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how does cyanide kill you? | i've been researching for a school paper but can't really find a reliable source. if you could explain it with sources that would be great. | cellular metabolism, cellular energy currency, electron transport chain ====== cyanide ion mainly acts as a poison by inhibiting your cellular metabolism. the cellular metabolism for most cells in your body involves two main phases: an anaerobic portion called glycolysis that generates, from glucose - the starting prec... | 10 | [] | [] | [
"http://www.jbc.org/content/269/39/24114.full.pdf"
] | [
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why do lcd monitors have fixed refresh rates? | why wouldn't an lcd monitor just be able to draw at whatever rate the image data is coming in at? | question for askscience, refresh, rate ====== this is an appropriate question for askscience. anyways, a fixed refresh rate makes sense for lcds. they hold their images between refreshes, so they don't "flicker" like crts do. you want the entire lcd screen to refresh at the same time, to eliminate "tearing" of the imag... | 7 | [] | [] | [] | [
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why do modern lcd monitors stick to the refresh rate model of crts? | as far as i know, the only part that could induce flicker is the backlight, and that operates at a much higher rate (200hz according to wikipedia). | answers your question, read and answers, human eye ====== _url_0_ this is a decent source to read and answers your question. anyhow, crt frame rate was is better than your average lcd monitor now days. crt monitors were usually equivalent to 75hz - 85hz. lcds on average are 60hz. the source i posted stated that it has ... | 38 | [] | [] | [
"http://m.cnet.com/news/what-is-refresh-rate/57524894"
] | [
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