q_id stringlengths 5 6 | title stringlengths 3 301 | selftext stringlengths 0 39.2k | document stringclasses 1
value | subreddit stringclasses 3
values | url stringlengths 4 132 | answers dict | title_urls list | selftext_urls list | answers_urls list |
|---|---|---|---|---|---|---|---|---|---|
1vic95 | the difference in taste or texture, if any, when one orders their drink shaken, not stirred. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1vic95/eli5_the_difference_in_taste_or_texture_if_any/ | {
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"Whenever I order a drink and ask them for specifics, I make sure I know what it tastes like before hand.\n\nSomething smooth and strong like a shot of vodka with a chaser is usually better stirred in my opinion because it di... | [] | [] | [
[],
[]
] | ||
2cf6r1 | what's the point of one-penny/one-dollar discounts? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2cf6r1/eli5_whats_the_point_of_onepennyonedollar/ | {
"a_id": [
"cjeuj7u",
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"score": [
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"text": [
"It's a ploy to make things appear subconsciously cheaper to the buyer",
"It has a psychological impact, as the mind tends to crop the numbers nor round then. ",
"This question concerns one of th... | [] | [] | [
[],
[],
[]
] | ||
2guuhz | How was drinking water distributed during ancient Rome? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/2guuhz/how_was_drinking_water_distributed_during_ancient/ | {
"a_id": [
"ckmur8a"
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"score": [
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"text": [
"Pompeii provides the most complete evidence, but it is worth noting that enough fragments can be found from other cities to lead to the conclusion that this was fairly common across the empire, so we don;t have to worry about falling into the Ve... | [] | [] | [
[
"http://staff.civil.uq.edu.au/h.chanson/pictures/ptgard.jpg",
"http://freephotooftheday.clientk.com/wp02/wp-content/uploads/2009/07/fountain-bull-pompeii-italy.JPG",
"http://www.romanaqueducts.info/aquasite/foto/watertorenpompeii.jpg"
]
] | ||
3uz3ju | how come video compression is getting better all the time, but sound files are still the same size as ever? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/3uz3ju/eli5_how_come_video_compression_is_getting_better/ | {
"a_id": [
"cxixkug"
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"score": [
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"text": [
"Audio compression is already really good, and has been for ages. People tend to be a bit more picky about audio quality (real or perceived) than they are about video quality, for some reason. \n\nThe bottom line is we don't really need better com... | [] | [] | [
[]
] | ||
3ayxqo | why do planes crash into each other when they have so much open sky and space to fly in? when i look up at the sky, it seems almost entirely clear of planes. | Unlike a car, planes don't have to travel a narrow path. (Or do they?)
I assume that it has something to do with crowded airports, crowded flight paths, standard cruising altitudes, not being able to react quickly enough due to high speeds....But as a 5-year-old, I'm sure there is a real explanation. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/3ayxqo/eli5_why_do_planes_crash_into_each_other_when/ | {
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"Almost all air accidents happen near takeoff/landing where all those planes are in a tight area. There is a very n... | [] | [] | [
[],
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os5zv | Why does the moon appear to rotate during the night? | During the last full moon, as it was rising at dusk, I happened to notice the pattern of the craters, "seas", plateaus, etc. I noticed that about 3/4 of the face is a darker grey and that the whiter 1/4 was on the right side of the moon, from my perspective. Then I noticed, while the moon was setting the next morning... | askscience | http://www.reddit.com/r/askscience/comments/os5zv/why_does_the_moon_appear_to_rotate_during_the/ | {
"a_id": [
"c3jo6p1"
],
"score": [
3
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"text": [
"It could be a number of reasons but the moon does \"wobble\" on its axis.\nIt's called [libration](_URL_0_).\n"
]
} | [] | [] | [
[
"http://www.youtube.com/watch?v=3f_21N3wcX8&feature=related"
]
] | |
7a83fc | (us) why do car manufacturers promote horse power so much in their product marketing when you can’t even use it to its full extent? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/7a83fc/eli5_us_why_do_car_manufacturers_promote_horse/ | {
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"dp7ux14",
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"score": [
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"text": [
"You can very much use it to its fullest extent. \n\nDon't switch gears, and let that needle climb all the way to the redline. \n\nIf you're asking why cars can go more than 100 mph when there aren't any roads where you're al... | [] | [] | [
[],
[]
] | ||
3hhlyc | how come hotel beds and pillows are so damn comfortable? | Lying in one right now! Sooo comfortable. What's the deal, why can't my bed and pillow at home feel like this? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/3hhlyc/eli5_how_come_hotel_beds_and_pillows_are_so_damn/ | {
"a_id": [
"cu7f8tz",
"cu7g8rm"
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"score": [
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2
],
"text": [
"i'm guessing the one at home you bought was some cheap POS mattress and some polyester fill pillow. investing in a quality mattress and down feather pillow/comforter goes a long way. ",
"The hotel is probably figuring ... | [] | [] | [
[],
[]
] | |
7nlrvh | why does ecstasy make your jaw swing like a nine iron? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/7nlrvh/eli5_why_does_ecstasy_make_your_jaw_swing_like_a/ | {
"a_id": [
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"text": [
"It is a byproduct of the stimulant part of MDMA the MA stands for methamphetamine. Your central nervous system is being extremely stimulated and this causes your jaw to tighten and your body doesn't want tight/locked jaw, so you continually move... | [] | [] | [
[]
] | ||
n7ul8 | If Earth had the orbit of Mars could it harbour life as we know it? | If Earth orbited the Sun the same way Mars does could it support the type of life which we are familiar with? | askscience | http://www.reddit.com/r/askscience/comments/n7ul8/if_earth_had_the_orbit_of_mars_could_it_harbour/ | {
"a_id": [
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"If you just moved the Earth the same distance away from the Sun as is Mars and all other factors were the same, I would argue that life as we know it would still exist there. Through Earth in it's new orbit would receive les... | [] | [] | [
[
"http://en.wikipedia.org/wiki/Mars",
"http://solarsystem.jpl.nasa.gov/planets/profile.cfm?Object=Mars&Display=Facts"
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"http://en.wikipedia.org/wiki/Mars",
"http://solarsystem.jpl.nasa.gov/planets/profile.cfm?Object=Mars&Display=Facts"
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4unj3b | Where did European classical singing arise and when did it spread throughout the continent? | With European classical singing I mean this school with lots of Italian terminology (soprano, rubato, vibrato, falsetto, timbre, tessitura) that you'll hear in every opera house throughout the world.
I'm asking for reasons:
- In folk traditions weird and loud singing ("yodling") is mostly found in mountainous areas... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/4unj3b/where_did_european_classical_singing_arise_and/ | {
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"score": [
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"text": [
"It is a bit mysterious how it came to be, but the short answer is Northern Italy, around the mid 16th century, in the church setting. No relation to yodeling at all actually. Yodeling has a [highly emphasized \"pop\" between vocal registers of he... | [] | [] | [
[
"https://archive.org/details/observationsonth26477gut",
"https://www.youtube.com/watch?v=dHE2ckvvv6o",
"https://books.google.com/books?id=STJ3n5uZ660C",
"https://books.google.com/books/about/Singing.html?id=TQ-DX4CyHYgC",
"http://press.uchicago.edu/ucp/books/book/chicago/O/bo11018610.html"
]... | |
2y0nyz | why is it uncomfortable to exercise? it does not seem to make evolutionary sense. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2y0nyz/eli5why_is_it_uncomfortable_to_exercise_it_does/ | {
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"text": [
"You should keep in mind that for essentially every animal but present-day humans (and even for some of us today), famine is much more likely than feast. So all creatures are evolv... | [] | [] | [
[],
[],
[],
[]
] | ||
5d6nje | Why is geosynchronous orbit around the equator on Earth constrained to one radius? | Why can't a satellite hover over a fixed point on earth from any radius, given that it has the correct orbital velocity? | askscience | https://www.reddit.com/r/askscience/comments/5d6nje/why_is_geosynchronous_orbit_around_the_equator_on/ | {
"a_id": [
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"text": [
"Because [orbital speed](_URL_0_) is completely determine by the gravitational field (that is, the mass of the planet) and the orbital parameters (that is, radius and eccentricity of the orbit). You don'... | [] | [] | [
[
"https://en.m.wikipedia.org/wiki/Orbital_speed"
],
[],
[]
] | |
3xppmk | In WW2, did Heer officer cadets got sent into battle before being promoted to actual officers? | I recently read the memoirs of a Romanian who went to tank school (at Neuruppin) in Germany to become an officer. What I find interesting is that he was both Gefreiter and Fahnenjunker, if I understood correctly, and before becoming an officer, he ended up at Kursk. He was promoted to Leutnant afterwards. Did the Germa... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/3xppmk/in_ww2_did_heer_officer_cadets_got_sent_into/ | {
"a_id": [
"cy6ygpu"
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"score": [
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"text": [
"In the Wehrmacht and other Prussian-influenced military organizations such as the Finnish armed forces, officers first spend some time in an officer training school, and then do a \"residency\" among troops as a Fänrich/Oberfänrich, acting with t... | [] | [] | [
[]
] | |
584e7q | Is noise additive in terms of causing hearing damage? | For example, say I'm listening to my non-isolating headphones in a quiet room with the average level from the phones being 80 decibels (or whatever is considered the max for longer-term safe listening). Now say I take the same phones, music, average playback level, etc. and fly across the US in a shitty economy class s... | askscience | https://www.reddit.com/r/askscience/comments/584e7q/is_noise_additive_in_terms_of_causing_hearing/ | {
"a_id": [
"d8xgtzp"
],
"score": [
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],
"text": [
"I first want to mention that the \"long term safe\" levels aren't precise, and quieter is better.\n\nSound is measured in dB, which is a logarithmic unit.\n\nIf your headphones are emitting 80 dB to your ears, and let's say the airplane is emitti... | [] | [] | [
[]
] | |
7r122f | In the movie Dr. Strangelove, the bomber aircrew are given survival kits containing a range of supplies both reasonable and comical. What sort of things would Cold War era American soldiers really be issued in these kits? If they got them at all. | As part of the checklist for preparing to drop the bomb, Maj Kong reads out the contents of the aircrew members survival kit.
Maj Kong: "Survival kit contents check. In them you’ll find: one .45 caliber automatic; two boxes of ammunition; four days concentrated emergency raisons[sic]; one drug issue containing: antibi... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/7r122f/in_the_movie_dr_strangelove_the_bomber_aircrew/ | {
"a_id": [
"dstpa36"
],
"score": [
85
],
"text": [
" To get an idea, I used the list of things that were found on Francis Powers - a US U-2 pilot that was shot down over USSR while on a spy mission:\n \n - A poison needle containing \"poison from curare group\"\n - A gun with a silencer\n - A sor... | [] | [] | [
[
"https://www.oldgazette.ru/lib/pauers/index.html",
"https://timesmachine.nytimes.com/timesmachine/1960/05/08/90661540.html?pageNumber=24"
]
] | |
11jvuz | Does the speed of light have any special meaning? Why is it the speed that it is? Is the scalar value of the velocity (disregarding units) unique somehow? | askscience | http://www.reddit.com/r/askscience/comments/11jvuz/does_the_speed_of_light_have_any_special_meaning/ | {
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"text": [
"It's the scale at which one unit of distance equals one unit of time. Imagine we measured horizontal distances in leagues and vertical distances in fathoms. We would need a conversion scale to tell us ... | [] | [] | [
[],
[],
[]
] | ||
28hlnw | What happened to heroin addicts that were drafted into WWII? | Or indeed to any war. Could they avoid the draft because of their addiction? Is there any evidence of heroin use by soldiers during the war?
I've tried to find an answer to this question but google only returns information about veterans who became addicts AFTER the war.
Thanks.
| AskHistorians | http://www.reddit.com/r/AskHistorians/comments/28hlnw/what_happened_to_heroin_addicts_that_were_drafted/ | {
"a_id": [
"cib2axv"
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"score": [
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"text": [
"You should try expanding your search to focus on drugs policies with regard to conscription and/or narrowing it to focus on a specific country. Finland, the country I'm most familiar with, is at the extreme end of the spectrum. A search for Finla... | [] | [] | [
[
"http://www.hs.fi/english/article/Finland+-+a+leading+consumer+of+heroin+from+the+1930s+to+the+1950s/1135245022270"
]
] | |
2777d4 | [Biology] Will increased ocean acidification have an effect on barnacles & other species that grow on ships? | I've already asked & received good answers for how increased oceanic acidity might wear on the various types of hull materials in mass production today (e.g., fiberglass, steel, aluminum), but how about the various hitchhikers sailors pick up in their travels? It would seem to me if [increased ocean acidification is ... | askscience | http://www.reddit.com/r/askscience/comments/2777d4/biology_will_increased_ocean_acidification_have/ | {
"a_id": [
"chy7pe2"
],
"score": [
3
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"text": [
"Without a doubt, OA is *the* dominant issue in Marine Ecology right now, so it is being studied furiously. However, we still have a lot to learn about its effects, and marine organisms have such complicated life histories and community interactio... | [] | [
"http://apps.seattletimes.com/reports/sea-change/2013/sep/11/oysters-hit-hard/"
] | [
[]
] | |
3hort9 | why do some people's eyes dart back and forth while making eye contact? | I find this more common with peoples of the opposite sex, so I was thinking maybe it is attraction. I am a male. I would love to hear from both sexes opinions or scientific expertise. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/3hort9/eli5_why_do_some_peoples_eyes_dart_back_and_forth/ | {
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"score": [
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"text": [
"What do you mean dart back and forth? Like averting their gaze? Because eye contact can be awkward? They're looking at other things?",
"Ask someone to stare at you the entire t... | [] | [] | [
[],
[],
[
"https://www.psychologytoday.com/blog/he-speaks-she-speaks/201009/the-politics-eye-contact-gender-perspective",
"http://www.apa.org/monitor/jan00/sc1.aspx"
],
[
"https://en.m.wikipedia.org/wiki/Nystagmus"
]
] | |
4ftdsz | why do people hate limp bizkit so much? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4ftdsz/eli5_why_do_people_hate_limp_bizkit_so_much/ | {
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"text": [
"Two reasons really. Firstly, Fred Durst has the reputation of being kind of a douche.\n\nSecondly, LB sort of became the face of the Nu Metal, which a lot of people don't like. The consensus is it's shitty rap and shitty roc... | [] | [] | [
[],
[]
] | ||
ko8mw | why is china seen as a threat to the united states? | I keep hearing about how Americans are scared of China becoming the new world power. Why is this? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/ko8mw/eli5_why_is_china_seen_as_a_threat_to_the_united/ | {
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16,
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"text": [
"Because Americans don't like that they actually have to follow rules and use diplomacy (not the gunboat kind) when they're not the onl... | [] | [] | [
[],
[],
[
"http://imgur.com/5wCEg",
"https://www.cia.gov/library/publications/the-world-factbook/index.html"
],
[],
[],
[
"http://imgur.com/5wCEg",
"https://www.cia.gov/library/publications/the-world-factbook/index.html"
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1m7tkc | Do all historians agree that Ancient Sumer was the first civilization | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1m7tkc/do_all_historians_agree_that_ancient_sumer_was/ | {
"a_id": [
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8
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"text": [
"What about Catalhoyuk? I'm fairly certain that including permanent settlements they also had agriculture and animal domestication. And then there's Gobekli Tepe. Surely that had to have required some sort of powerful society... | [] | [] | [
[],
[
"http://en.wikipedia.org/wiki/Pre-Pottery_Neolithic_A"
]
] | ||
1finrw | why vitamin supplements can't be used as substitutes? | So you open up a box of multi-vitamin pills which advertise that they have 100% of an adult's RDA of vitamin X, Y and Z, but at the same time the instructions tell you that these are not to be used as substitutes. How come? Are the vitamins in the pills not guaranteed to be fully absorbed into the body? Is there some s... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1finrw/eli5_why_vitamin_supplements_cant_be_used_as/ | {
"a_id": [
"caamwgz",
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"score": [
9,
8
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"text": [
"Legally covering. Keep in mind 100% of the recommended value doesn't mean it is 100% for your size, sex, health, & diet. So, they don't want you taking their very simplified chart as a guide for your entire health.",
"... | [] | [] | [
[],
[]
] | |
3228ra | Why do we have so many surviving works of Plato, while most of Aristotle's writings are lost? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/3228ra/why_do_we_have_so_many_surviving_works_of_plato/ | {
"a_id": [
"cq7svgv"
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"score": [
3
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"text": [
"The sad truth about the survival of our historical sources is that its just a matter of luck. What survives the night of times and what not its just that, luck. But maybe the most important reason in this particular case is the Macedonian origin ... | [] | [] | [
[]
] | ||
3rg4l1 | If not all stars are massive enough to become black holes, then there must be point where a Star becomes massive enough. What is changing once that threshold is reached? | [deleted] | askscience | https://www.reddit.com/r/askscience/comments/3rg4l1/if_not_all_stars_are_massive_enough_to_become/ | {
"a_id": [
"cwo1t5e"
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"score": [
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"text": [
"The limit you are referring to is the Chandrasekhar limit, which is 1.39 solar masses. Basically, some stars at the end of their life will collapse down to white dwarfs, but these white dwarfs have a maximum mass of 1.39 solar masses. This is bec... | [] | [] | [
[
"http://www.nature.com/scientificamerican/journal/v306/n3/box/scientificamerican0312-32_BX2.html"
]
] | |
cflqc8 | why can't surgeons just pull out huge chunks of body fat at a time with a glove or a modified vacuum hose? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/cflqc8/eli5_why_cant_surgeons_just_pull_out_huge_chunks/ | {
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"text": [
"For real if I ever need to go under the knife for something I'd love to talk to the su... | [] | [] | [
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97a9xo | is the saying "red sky at night, a shepherd's delight" true and if so, why? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/97a9xo/eli5_is_the_saying_red_sky_at_night_a_shepherds/ | {
"a_id": [
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"score": [
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18
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"text": [
"Red sky at night, sailors delight.\nWhen we see a red sky at night, this means that the setting sun is sending its light through a high concentration of dust particles. This usually indicates high pressure and stable air co... | [] | [] | [
[],
[]
] | ||
1iwvy6 | distillation as it pertains to alcoholic drinks | I very much enjoy adult beverages like whiskey, brandy, and vodka, but don't really understand the basics of what happens during the distillation phase of their creation. Thanks! | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1iwvy6/eli5_distillation_as_it_pertains_to_alcoholic/ | {
"a_id": [
"cb8tq3h"
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"text": [
"Once the liquid that they are making the liquor out of has been fermented, and has alcohol in it, then the alcohol needs to be concentrated. Alcohol has a slightly lower boiling point than water, so they heat the liquid (which is called a mash by... | [] | [] | [
[]
] | |
x1vlf | why h2o is vital to life, but h2o2 is dangerous | The only difference between the two is an oxygen atom, which we breathe, so how are they so different? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/x1vlf/eli5_why_h2o_is_vital_to_life_but_h2o2_is/ | {
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"text": [
"the extra oxygen makes all the difference!\n\nperoxide is an oxidizing agent, which means that when the molecule breaks apart it will steal electrons from o... | [] | [] | [
[],
[],
[],
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[]
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56yhqp | why are we trying to colonize mars? | There's been a lot of news lately about SpaceX, Boeing, etc trying to send a colony to Mars.
What's the point? What is there on Mars that we haven't seen through the rovers? Why send humans there if they can never survive without a suit? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/56yhqp/eli5_why_are_we_trying_to_colonize_mars/ | {
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"d8nwyze",
"d8nx0zt",
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"d8nxuh1",
"d8nyenm",
"d8nygjw",
"d... | [] | [] | [
[],
[],
[],
[],
[],
[
"http://waitbutwhy.com/2015/08/how-and-why-spacex-will-colonize-mars.html",
"http://www.slate.com/blogs/bad_astronomy/2015/04/16/elon_musk_and_mars_spacex_ceo_and_our_multi_planet_species.html"
],
[],
[],
[],
[],
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"https://www.youtube.com/watch?v=... | |
35ltcn | why does licking a seemingly dead pen make the pen able to write again? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/35ltcn/eli5_why_does_licking_a_seemingly_dead_pen_make/ | {
"a_id": [
"cr5ks5h"
],
"score": [
11
],
"text": [
"Pens are a chamber with ink in it and a steel ball jammed in a tight-fitting tube at the lower end. When you write, the ball turns, \"rolling\" the ink onto the paper, then rotating up into the ink supply to bring more down.\n\nPens with ink sti... | [] | [] | [
[]
] | ||
b0w150 | Operation Market Garden | Can anyone explain to me about what Market Garden was | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/b0w150/operation_market_garden/ | {
"a_id": [
"eii2uoc"
],
"score": [
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"text": [
"The western allies had landed in northern France in Operation Overlord in June 1944 and then in southern France in Operation Dragoon and had encircled and routed the German counter-attack at Falaise in August 1944. After that, the western allies ... | [] | [] | [
[]
] | |
6egwp2 | How did parents give their kids 'the sex talk' before modern biology gave us the means to explain the details of reproduction? | For example, if a child in classical Greece or babylon asked her mom "where do babies come from?", what would she say?
How did parents explain to their kids what happens between sex and birth? Was this information hidden from kids until they reach a certain level of maturity, or was it just out in the open? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/6egwp2/how_did_parents_give_their_kids_the_sex_talk/ | {
"a_id": [
"dibcy9u"
],
"score": [
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"text": [
"First off the modern \"Birds and the Bees\" discussion acts like sex is a taboo subject, as does our modern society as a whole. However in places like Ancient Greece we can see that was not so true. In places like America, in places like the US y... | [] | [] | [
[
"https://blogs.ucl.ac.uk/researchers-in-museums/2013/01/07/fascinus-the-winged-phallus-tattoo/"
]
] | |
15hpov | why isn't a zip code enough when entering an address, why must i give my state, city and zip code? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/15hpov/why_isnt_a_zip_code_enough_when_entering_an/ | {
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2e7idq | What keeps our gut bacteria from eating our live tissues? | According to this [HowStuffWorks article](_URL_0_) our gut bacteria begin the large part of decomposition a few days after our death. So what's actively keeping them from eating us while also allowing them to thrive in our gut? | askscience | http://www.reddit.com/r/askscience/comments/2e7idq/what_keeps_our_gut_bacteria_from_eating_our_live/ | {
"a_id": [
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"score": [
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2,
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"text": [
"Our immune system stops them from invading deeper into the body by providing physical barriers, secreting antibodies (IgA) into the gut and sensing and fighting ones that get too invasive. For instance ... | [] | [
"http://health.howstuffworks.com/diseases-conditions/death-dying/dying4.htm"
] | [
[],
[],
[]
] | |
1nkgdj | Why would centrifugal space cylinders for artificial gravity work? | I understand the concept of centrifugal force (I think), but I started pondering as I was reading Rendezvous with Rama (and watching Elysium, with the Ender's Game trailer before it, so many space cylinders!). If you start at the axis of the cylinder you can float in zero-g along the axis, as a character does in RwR. W... | askscience | http://www.reddit.com/r/askscience/comments/1nkgdj/why_would_centrifugal_space_cylinders_for/ | {
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"score": [
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4,
2,
2
],
"text": [
"In space, yes, you could be near the spinning surface and not be affected. In atmosphere, though, atmospheric gases would be affected by the spin, and thus centrifugal forces, and ... | [] | [] | [
[],
[],
[
"http://en.wikipedia.org/wiki/Centripetal_force"
],
[]
] | |
28d5f6 | how does putting black charcoal marks below your eyes help you see better in sunlight? | Like the classic football player, hunter, or soldier look with the thick black lines drawn below their eyes. How does it help? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/28d5f6/eli5_how_does_putting_black_charcoal_marks_below/ | {
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"text": [
"It reduces glare from light reflected under your eye and then into the eye.\nIt's like standing in the sand, the glare from the sand makes it harder to see... | [] | [] | [
[],
[],
[],
[],
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"http://www.airmuseumsuk.org/airshow/2004/Rougham2004/800/images/215%20North%20American%20P-51D%20Mustang%20472218%20G-HAEC.jpg"
]
] | |
b54aok | How did "The Eclipse of Darwinism" in the late nineteenth/early twentieth centuries occur simultaneously with the rise of eugenic Social Darwinism? Was there a schism in biology and anthropology at the time? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/b54aok/how_did_the_eclipse_of_darwinism_in_the_late/ | {
"a_id": [
"ejb6tf0"
],
"score": [
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"text": [
"The Eclipse of Darwinism was a period in which biologists doubted that Darwinian natural selection (with its heavy emphasis on gradualism) was responsible for species change. Alternative theories proposed and discussed at the time to explain spec... | [] | [] | [
[]
] | ||
2m3loj | how come some countries' currency cannot be exchanged like incidentally mine (tunisia) | So I know that it has something to do with the monetary value of a certain currency but other than that I just don't get it ,since this restricts lots of people from purchasing online | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2m3loj/eli5_how_come_some_countries_currency_cannot_be/ | {
"a_id": [
"cm0mz7t"
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"score": [
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"text": [
"Exchanging currency isn't really 'exchanging currency', it's selling your money like selling anything else. In order to 'convert' CAD to USD for example I must find someone willing to pay me in USD for my CAD. \n\nIf I can't find a buyer then I c... | [] | [] | [
[]
] | |
1nb79t | how can the ups trademark the color brown? | I got an email from UPS letting me know about the exciting innovations they're making in the realm of shipping. At the bottom, the following caught my eye:
©2013 United Parcel Service of America, Inc. UPS, the UPS brandmark, and the color brown are
trademarks of United Parcel Service of America, Inc. All rights reserv... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1nb79t/eli5_how_can_the_ups_trademark_the_color_brown/ | {
"a_id": [
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"score": [
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5
],
"text": [
"Cadbury also trademark the colour purple. I'm guessing it's only that specific shade and is only trade marked to delivery companies or chocolate. ",
"They actually trademarked Pullman Brown, and the limitations of the tr... | [] | [] | [
[],
[]
] | |
7ppmj8 | how does buying us treasury bills help in keeping chinese yuan low? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/7ppmj8/eli5_how_does_buying_us_treasury_bills_help_in/ | {
"a_id": [
"dsj0bo1"
],
"score": [
8
],
"text": [
"If China spends yuan to buy dollars (which you have to do because T-Bills are sold in dollars), this increases the supply of available yuan and decreases the supply of available dollars. Due to the free market, this drives down the price of yuan ... | [] | [] | [
[]
] | ||
99ip2r | If the universe is expanding at an accelerating rate, does that imply that certain parts of the universe are in principle unobservable/unknowable? | askscience | https://www.reddit.com/r/askscience/comments/99ip2r/if_the_universe_is_expanding_at_an_accelerating/ | {
"a_id": [
"e4o1s4u"
],
"score": [
41
],
"text": [
"Yes. Although more and more galaxies will continue to enter our observable universe, any galaxy that is currently farther than about 65 Gly will never be seen at all. (For reference the current radius of the observable universe is about 47 Gly.)... | [] | [] | [
[]
] | ||
jmue0 | What happens when you try to fertilize a chimpanzee egg with human sperm? And a human egg with chimpanzee sperm? | askscience | http://www.reddit.com/r/askscience/comments/jmue0/what_happens_when_you_try_to_fertilize_a/ | {
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"score": [
9,
2,
8,
2,
9,
2,
8,
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"text": [
"Chimps have 24 chromosome pairs, Humans have 23. I think the resulting fertilized egg would... | [] | [] | [
[],
[
"http://en.wikipedia.org/wiki/Mule#Fertility"
],
[
"http://en.wikipedia.org/wiki/Humanzee"
],
[],
[],
[
"http://en.wikipedia.org/wiki/Mule#Fertility"
],
[
"http://en.wikipedia.org/wiki/Humanzee"
],
[]
] | ||
3f6v5q | Did knights/athletes/anybody in the early to late middle ages know about stretching? Do we know if it was suggested or practiced? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/3f6v5q/did_knightsathletesanybody_in_the_early_to_late/ | {
"a_id": [
"ctn9xyd"
],
"score": [
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"text": [
"You could try asking on /r/wma, where they do a lot of reading of late medieval fighting manuals."
]
} | [] | [] | [
[]
] | ||
2ayd1g | Wasp Sealing Own Nest? | I have a wasp nest on my patio, it's a burrowed hole inside the wood that I have noticed a wasp or two flying in and out of in the past month.
Yesterday I stood and watched this wasp sealing off the hole. It looked like a dried paste that covers the whole thing.
My two questions are:
What is the seal made of & why... | askscience | http://www.reddit.com/r/askscience/comments/2ayd1g/wasp_sealing_own_nest/ | {
"a_id": [
"cj001aa",
"cj0sror"
],
"score": [
7,
3
],
"text": [
"They are sealing in their young. They will implant food and an embryo and seal it up to protect the baby till the baby can come out. It's sealed with the same thing the nest is made of - what that is I do not know.",
"Th... | [] | [] | [
[],
[
"http://en.wikipedia.org/wiki/Spider_wasp"
]
] | |
1avd5k | What was marriage like with the slaves in the United States? What were their traditions and ceremonies like? What reasons would they choose a partner? How did slave owners look at the marriages? | I know there is quite a bit of time for the traditions to evolve and change, but I am just trying to get a grasp of what it was like. I know it happened, and there are a lot of stories about married couples being sold to different owners. But what was the marriage ceremony like? What were the motivations for marriage w... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1avd5k/what_was_marriage_like_with_the_slaves_in_the/ | {
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"score": [
6,
3,
3,
7
],
"text": [
"A book that would help is Eugene Genovese's classic, *Roll Jordan Roll: The World the Slaves Made*.\n\n_URL_0_\n\nNow, Genovese is a complex character, and understanding his changi... | [] | [] | [
[
"http://books.google.com/books?id=fHtvU_6EC9EC&printsec=frontcover&dq=editions:y_DMStCURsUC"
],
[
"http://www.amazon.com/One-Drop-Fathers-Life--A-Secrets/dp/B0031MA91E/ref=sr_1_1?ie=UTF8&qid=1364082219&sr=8-1&keywords=one+drop+bliss+broyard"
],
[],
[]
] | |
104pkw | What areas of the earth would best weather global warming? | I can't find much about it on the web, all I see is which areas are most affected right now. I | askscience | http://www.reddit.com/r/askscience/comments/104pkw/what_areas_of_the_earth_would_best_weather_global/ | {
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"score": [
6,
5,
2,
3,
2,
3
],
"text": [
"The problem of global warming is not the change in climate itself - it is the rate of change coupled with the fact that we have adapted ... | [] | [] | [
[
"http://en.wikipedia.org/wiki/File:Global_Warming_Predictions_Map.jpg"
],
[],
[],
[],
[],
[
"http://en.wikipedia.org/wiki/Inner_core"
]
] | |
3fsshh | Is there any truth to the idea that Coca Cola secretly made special "White Coke" without colouring, at the request of Soviet Marshall Georgy Zhukov? (x-post r/AskHistory) | I've heard this a few times and never thought much of it. But now I'm curious, because it certainly sounds like it could be a myth, and when I looked into a bit, it seems there aren't much in the way of real sources besides unsubstantiated account of Tom Standage.
Do we know if Coke really secretly made White Coke for... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/3fsshh/is_there_any_truth_to_the_idea_that_coca_cola/ | {
"a_id": [
"ctrxhqo"
],
"score": [
3
],
"text": [
"I'm assuming you've looked at the Wiki page for this, so I won't bother pointing you there. \n\nThe only vaugley scholarly source that addresses this in any detail is Mark Pendergast's *For God, Country, and Coca-Cola*. Basically, Pendergast co... | [] | [] | [
[]
] | |
2lkv2t | i wipe my bottom very well until the tp comes back clean - without fail 20 minutes later i have to "re-wipe" - what the hell is going on? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2lkv2t/eli5_i_wipe_my_bottom_very_well_until_the_tp/ | {
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242,
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],
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[],
[],
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[]
] | ||
6fxftk | Can the strands of DNA accidentally get tied into a knot? | If they can, does it matter? | askscience | https://www.reddit.com/r/askscience/comments/6fxftk/can_the_strands_of_dna_accidentally_get_tied_into/ | {
"a_id": [
"dily4ts"
],
"score": [
67
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"text": [
"Yes. Any sufficiently long polymer has essentially a 100% chance of being knotted, and DNA is no exception. Viruses, which contain very compacted DNA, when they splort out DNA into cells [have a chance of splorting out knotted DNA](_URL_0_). In ... | [] | [] | [
[
"http://www.pnas.org/content/99/8/5373.long"
]
] | |
2qd7v3 | Why weren't huge dinosaurs crushed under their own weight? | Merry Christmas y'all! | askscience | http://www.reddit.com/r/askscience/comments/2qd7v3/why_werent_huge_dinosaurs_crushed_under_their_own/ | {
"a_id": [
"cn5b5cs"
],
"score": [
7
],
"text": [
"They weren't fat, they were big-boned. \nBut seriously, they had big bones and big muscles, big lungs and a big heart, and had evolved into that body-size. Imagine an ant looking up at a human thinking \"how does it not collapse or fall over?\" ... | [] | [] | [
[]
] | |
24ak5q | What do EEG signals really mean? | Hello folks, I've been reading about studies of EEG response to visual stimuli and noting all the interpretations of how P1 and N2 relate to different psychological traits, when it occurs to me I don't really understand what these signals are fundamentally.
The EEG picks up oscillations in electrical field o... | askscience | http://www.reddit.com/r/askscience/comments/24ak5q/what_do_eeg_signals_really_mean/ | {
"a_id": [
"ch5jx6g"
],
"score": [
2
],
"text": [
"The EEG signal at the scalp is a measure of the mean voltage of an area of cortex induced by synchronous excitatory and inhibitory post-synaptic potentials on large pyramidal neurons. A negative amplitude peak at the scalp corresponds to synchron... | [] | [] | [
[]
] | |
1jt0nh | Creative history writing assignment or project? | Any suggestions for a more creative writing assignment or project for my 20th Century Europe course in the fall rather than just having them do a standard research paper?
I would still want the students to engage in some historical interpretation with a main thesis and argumentation, and they would still have to eng... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1jt0nh/creative_history_writing_assignment_or_project/ | {
"a_id": [
"cbi320k",
"cbi4z4z",
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"score": [
2,
2,
2
],
"text": [
"One of my art history classes gave an interesting assignment where we had to curate a \"imaginary museum\". We had to draft catalog entries, exhibition labels, and bibliographies, as well as a initial p... | [] | [] | [
[],
[],
[]
] | |
a89i5x | how do you doctors diagnose bacterial/viral illness? | I.E. Ebola etc. | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/a89i5x/eli5_how_do_you_doctors_diagnose_bacterialviral/ | {
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18,
5,
3,
2,
5
],
"text": [
"Clinically, some bacterial/viral illnesses have very distinguishing features that give you a hunch towards what the disease may be caused from. Symptoms such... | [] | [] | [
[],
[],
[],
[],
[
"https://en.m.wikipedia.org/wiki/Laboratory_diagnosis_of_viral_infections"
]
] | |
1xk37t | After WW2, how was Japan and Germany treated in the following Olympics? | Germany hosted the games in 1936, WW2 ended in 1945 and the first Olympics after the war was only 3 years later in 1948 in Switzerland.
Was Germany and/or Japan invited to those games? Did they attend and if so, what kind of reaction did they get from the audience? 3 years is definitely not a long time after such ... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1xk37t/after_ww2_how_was_japan_and_germany_treated_in/ | {
"a_id": [
"cfc58ys"
],
"score": [
21
],
"text": [
"The 1948 Olympics were held in London and Germany and Japan were not invited to participate as a result of their role as aggressors. "
]
} | [] | [] | [
[]
] | |
6ya0dj | why do we rely on donations from the public for disaster relief? isn't this the government's responsibility? | We pay taxes so the government can protect its people. Shouldn't the government be able to fully fund disaster relief without relying on contributions from the general public? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/6ya0dj/eli5_why_do_we_rely_on_donations_from_the_public/ | {
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2,
5,
9,
5,
5,
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"text": [
"Yeah that's true, but private charities require donations to survive. Thus when a disaster hits charities go for donation drives and as... | [] | [] | [
[],
[],
[],
[],
[],
[]
] | |
6q31lw | Why do some people have good sense of direction while other don't? Do we know how the brain differs in such people? | askscience | https://www.reddit.com/r/askscience/comments/6q31lw/why_do_some_people_have_good_sense_of_direction/ | {
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"score": [
2517,
304,
125,
19,
40,
18,
210,
26,
9,
... | [] | [] | [
[
"https://www.brainscape.com/blog/2015/06/humans-innate-sense-of-direction/",
"http://www.nytimes.com/2010/08/29/magazine/29language-t.html"
],
[
"https://www.ncbi.nlm.nih.gov/pubmed/17024677"
],
[],
[
"https://www.theregister.co.uk/2006/11/17/the_odd_body_nose_compass/"
],
[],
[
... | ||
6aklzp | Why is Sulphur used in the vulcanization process instead of some other element? | Is there a specific reason it has to Sulphur? Or can the cross links be formed using another element such as selenium or oxygen. I'm guessing it's because of the relative abundance and ease of use of Sulphur compared to the other elements, but I'm not sure.
And is this process only applicable to the vulcanization of n... | askscience | https://www.reddit.com/r/askscience/comments/6aklzp/why_is_sulphur_used_in_the_vulcanization_process/ | {
"a_id": [
"dhghemb"
],
"score": [
3
],
"text": [
"Ok so I worked in Zinc Oxide which is used as a catalyst for the rubber curing. I only did a bit on the rubber side so hopefully someone can come and fill that in, but yes Sulphur I presume works to form di/trisulfide bridges similar to what it d... | [] | [] | [
[]
] | |
c82c5q | why are insulated cups made from seemingly highly conductive materials like stainless steel or aluminum? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/c82c5q/eli5_why_are_insulated_cups_made_from_seemingly/ | {
"a_id": [
"esj72fv",
"esj7ggs"
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"score": [
2,
8
],
"text": [
"They are usually double-layered. Meaning, there is a metal cup inside another metal cup, insulated from each other by air, and only connected around the rim. Air makes an excellent insulator.\n\nMetal is used because it's wa... | [] | [] | [
[],
[]
] | ||
sln9s | Why do we recycle paper? | As I understand it, global warming is being caused largely by excess carbon dioxide in the atmosphere, so one solution to global warming would be to reduce the carbon dioxide in the atmosphere.Plants pull the carbon dioxide out of the atmosphere through carbon fixation, and then use that carbon to make complex hydrocar... | askscience | http://www.reddit.com/r/askscience/comments/sln9s/why_do_we_recycle_paper/ | {
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"text": [
"It's better to let more trees grow and continue to fix carbon, by recycling paper, than cutting down MORE trees to make more paper, thereby reducing how much carbon is being fixed.... | [] | [] | [
[],
[],
[
"http://en.wikipedia.org/wiki/Carbon_cycle",
"http://www.wired.com/wiredscience/2009/02/carbonstorage/",
"http://www.straightdope.com/columns/read/2231/how-is-paper-made"
],
[
"http://thepaperlifecycle.org/end-of-life/in-depth/the-landfill-and-climate-change/"
]
] | |
bw9cuc | how does a store know i'm stealing something? | Edit: to clarify. I'm talking about these vertical things near the entrance, which set an alarm off if you bring something unpaid for close | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/bw9cuc/eli5_how_does_a_store_know_im_stealing_something/ | {
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"epw07xv",
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"score": [
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"text": [
"I would rephrase this question to ask how the sensor monitors in stores detect the theft sensors on items.",
"I’m not sure if I can write enough words for ELI5:\n\nSensors by the door don’t work for... | [] | [] | [
[],
[],
[]
] | |
5ayb93 | why do we sometimes think someone's first name fits that particular person? i.e; "you look like a dave" and when we try to associate a different name to them it feels weird and mismatched | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/5ayb93/eli5_why_do_we_sometimes_think_someones_first/ | {
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"text": [
"\nChong: Who?\nCheech: Dave, man. Open up.\nChong: Dave?\nCheech: Yeah, Dave.\nChong: Dave's not here.\nCheech: What the hell? No, man, I am Dave, man. Will you...\n(More knocks)\nCheech: c'mon! Open up... | [] | [] | [
[],
[],
[]
] | ||
1owd18 | Why when bacteria are becoming antibiotic resistant, are we not using Phages to attack bacterial infections more. | Phage therapy has many potential applications in human medicine as well as dentistry, veterinary science, and agriculture. It's a virus that only attacks the bacteria killing it and using its dna to replicate. | askscience | http://www.reddit.com/r/askscience/comments/1owd18/why_when_bacteria_are_becoming_antibiotic/ | {
"a_id": [
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"text": [
"The biggest obstacle is that each phage is relatively specific to one organism. One of the big obstacles is finding a phage that would work well against the specific problem organism. The medical system would need to isolate... | [] | [] | [
[],
[]
] | |
rdheq | how the large hadron collider could help scientists understand how something can come from nothing. | I know it's not really simple, but I don't understand the connection. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/rdheq/eli5_how_the_large_hadron_collider_could_help/ | {
"a_id": [
"c44xaqs",
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"score": [
4,
2
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"text": [
"In order to even begin learning about the origins of the universe we first have to understand how the tiniest bits of matter actually work. In the world we know things are governed by basic physics (Newton's Law's of motion... | [] | [] | [
[],
[]
] | |
2dhesq | Force-carrying particles and other misc questions? | Hi, guys. Amateur here who lately has been reading and learning about science. Recently started reading through the Feynman Lectures on Physics. But the more I learn, the more questions I get, and I'm hoping to get some spoilers from you guys.
----
* Gravitons vs Space-time Curvature
Even amateurs like me are famili... | askscience | http://www.reddit.com/r/askscience/comments/2dhesq/forcecarrying_particles_and_other_misc_questions/ | {
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"text": [
"Your confusion comes from the idea that interacting objects are constantly shooting particles at each other, which isn't the case. If that were true, we'd see, for example, glowing light between two magnets. Really, it's an ... | [] | [] | [
[],
[]
] | |
2m6xhr | How do our lungs not freeze when we breathe in extremely cold air? | I live in Minnesota, and the temperatures can get down to about -20 degrees Fahrenheit (-29 Celsius). How is it that we can still maintain a constant internal temperature if we are nearly constantly taking in such cold temperatures? | askscience | http://www.reddit.com/r/askscience/comments/2m6xhr/how_do_our_lungs_not_freeze_when_we_breathe_in/ | {
"a_id": [
"cm1u4qm",
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"score": [
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"text": [
"The human nose simply does a great job at warming and moisturizing the cold and dry winter air and it will be warm enough when it reaches your lungs which is why you're fine with breathing it.\n\nThe above however doesn't ap... | [] | [] | [
[],
[]
] | |
12jkfu | What would happen if Planck's Constant was much bigger than it is? | askscience | http://www.reddit.com/r/askscience/comments/12jkfu/what_would_happen_if_plancks_constant_was_much/ | {
"a_id": [
"c6vlhy3",
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"text": [
"Yes, things would act more quantum-mechanically. Atoms would be much larger, as electrons (and everything else) would be more spatially spread-out (\"wave-like\", if you want) because of this. You'd soon not have matter-as-w... | [] | [] | [
[
"http://en.wikipedia.org/wiki/Natural_units",
"http://www.reddit.com/r/askscience/search?q=planck+&restrict_sr=on",
"https://www.youtube.com/watch?v=2Z6UJbwxBZI"
],
[]
] | ||
6dggd8 | What happened to the women in the emperor's harem after the death of "their" emperor during the Qing Dynasty in China? | I just finished watching Empresses in the Palace on Netflix and wondered about the harem after the emperor's death. This topic might be discussed in the longer original series, but I'm only a couple episodes in there and I don't know how accurate what they say would be, anyway.
So, historically speaking, during the Qi... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/6dggd8/what_happened_to_the_women_in_the_emperors_harem/ | {
"a_id": [
"di2hgz2"
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"text": [
"I can't be sure this information applies to the system as it was under the Qing, but during the Tang dynasty an emperor's concubines would have their heads shaved and be required to retire to a nunnery after the emperor's death. This was because... | [] | [] | [
[
"https://mikedashhistory.com/2012/08/11/the-demonization-of-empress-wu/"
]
] | |
3skf5v | is it possible to do insider trading accidentally and be convicted? | If I sell my shares in a company when the stock price is climbing, because, for example, I'd rather sell now, when the price is high, than take the risk of having to sell at a lower price at a later time (because I may anticipate a decline), and that the stock price crashes a few hours or days later in a way that was t... | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/3skf5v/eli5_is_it_possible_to_do_insider_trading/ | {
"a_id": [
"cwxzng5",
"cwxzv9s"
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"score": [
3,
2
],
"text": [
"In this scenario, it doesn't sound like you have any insider knowledge. In order to be convicted, the prosecutors need to prove that you were in possession of inside information.",
"Standard disclaimer, IANAL\n\nIt would... | [] | [] | [
[],
[
"http://www.sec.gov/answers/insider.htm",
"https://en.wikipedia.org/wiki/Raj_Rajaratnam/Galleon_Group,_Anil_Kumar,_and_Rajat_Gupta_insider_trading_cases"
]
] | |
4ddopv | the differences between "franchised" mcdonalds and non-"franchised" mcdonalds | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4ddopv/eli5_the_differences_between_franchised_mcdonalds/ | {
"a_id": [
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"score": [
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2,
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"text": [
"It's corporate and franchise stores.\n\nThe corporate ones are owned by McDonald's. The franchise store's owner pays a fee to corporate McDonald's to use the name, signage, menu and products.\n\nNot al... | [] | [] | [
[],
[],
[]
] | ||
8hp1cb | How Long did it take to get places by ship? | During, let’s say the 1800s, how long did typical ship journeys take? Let’s say you were going from the UK to India, or Ireland, or America. How long would each of those journeys take? Does it depend on the boat type, or the season, etc.? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/8hp1cb/how_long_did_it_take_to_get_places_by_ship/ | {
"a_id": [
"dylokyg"
],
"score": [
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"text": [
"I hope that by '1800s' you mean 19th century, not only the first decade of it, as the following addresses almost whole century.\n\nIn the beginning of the 19th century, the speed of an average merchant ships used for transoceanic trade, such as B... | [] | [] | [
[]
] | |
74tugn | how do doctors keep up to date with new information/techniques? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/74tugn/eli5_how_do_doctors_keep_up_to_date_with_new/ | {
"a_id": [
"do12k0k",
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"score": [
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2
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"text": [
"They are required to recertify every now and then, as well as being mandated to attend seminars and conferences about the latest of medical science in their fields.\n\nAlso, a doctor in a specific field is likely to want to ... | [] | [] | [
[],
[]
] | ||
5x9qk6 | Is it true that during the medieval era, the Islamic world was the home of science and research? | I was taught about this during my history class, and if so, why is not today? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/5x9qk6/is_it_true_that_during_the_medieval_era_the/ | {
"a_id": [
"degist0",
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5,
262,
229
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"text": [
"As a follow-up question: I'm currently reading Jim al-Khalili's \"Pathfinders. The Golden Age of Arabic Science\". Is this considered a good and accurate popular science book ... | [] | [] | [
[],
[],
[
"https://www.reddit.com/r/AskHistorians/comments/29myqm/how_islamic_was_the_islamic_golden_age/cimlds7/",
"https://www.reddit.com/r/AskHistorians/comments/22zg0d/did_mongols_cause_the_cultural_shift_from/",
"https://www.reddit.com/r/AskHistorians/comments/5fb5wp/is_it_true_that_the_islamic... | |
1zllco | Could relations between Europeans and Native Americans have turned out any other way in the 18th century? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1zllco/could_relations_between_europeans_and_native/ | {
"a_id": [
"cfux9oo"
],
"score": [
2
],
"text": [
"This might be more of a question for /r/HistoricalWhatif "
]
} | [] | [] | [
[]
] | ||
1ptl4s | Why don't sound waves of same frequenvies cancel out each other? | I was wondering, just like other concepts of physics, where equal and opposite charges/forces cancel out each other, why doesn't it apply on wave nature of objects, or does it? | askscience | http://www.reddit.com/r/askscience/comments/1ptl4s/why_dont_sound_waves_of_same_frequenvies_cancel/ | {
"a_id": [
"cd5w2bp",
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"score": [
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"text": [
"It definitely applies to waves as well. For your example of sound waves, set up two speakers about 1m apart and then walk along in front of them a few metres away and you will notice loud patches and quiet patches. These pat... | [] | [] | [
[],
[
"http://en.wikipedia.org/wiki/Destructive_interference"
]
] | |
8ue86r | How would the eruption of a volcano like Krakatoa compare to an eruption of The Yellowstone Caldera? | Let’s say both were placed in the center of the USA, what would be the comparative fallout from the two volcanoes? | askscience | https://www.reddit.com/r/askscience/comments/8ue86r/how_would_the_eruption_of_a_volcano_like_krakatoa/ | {
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"text": [
"Volcanologists have a scale called VEI - Volcanic Explosivity Index. It's a logarithmic scale based on how much rock an explosive eruption blasts into the air.\n\nThe Krakatoa eruption was a 6. The more... | [] | [] | [
[
"https://en.wikipedia.org/wiki/Volcanic_Explosivity_Index"
],
[
"https://en.wikipedia.org/wiki/Year_Without_a_Summer",
"https://en.wikipedia.org/wiki/Toba\\_catastrophe\\_theory",
"https://en.wikipedia.org/wiki/1815_eruption_of_Mount_Tambora",
"https://en.wikipedia.org/wiki/Year\\_Without\... | |
35cy7s | why did the hobbit movies use so much cgi (like in the famous ian mckellen crying picture) instead of real sets/ actors? | It may be obvious that its just less expensive, but some times they wouldn't even have the actors be in the same room. Is there another reason to this other than money? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/35cy7s/eli5_why_did_the_hobbit_movies_use_so_much_cgi/ | {
"a_id": [
"cr39skg",
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"score": [
3,
3
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"text": [
"I guess no one remembers how cgi intensive the lord of the rings were with the battle of Rohan. It would a lot more time and money to create those sets and hire the actors. The Lotr took a long time to film. While the hobbit... | [] | [] | [
[],
[]
] | |
bbsumj | Can anyone tell me the history of this trench art? | [deleted] | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/bbsumj/can_anyone_tell_me_the_history_of_this_trench_art/ | {
"a_id": [
"ekl6iuy"
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"text": [
"_URL_0_\n\nMore info: it has many names on it, including, although I’m sure unrelated, “Walter Churchill”. I’m just curious as to any info on “BTR” or their names, or anything. It’s quite a beautiful piece."
]
} | [] | [] | [
[
"https://imgur.com/gallery/JxzDkH1"
]
] | |
4kiz80 | The Earth is an oblate spheroid, but what about the atmosphere? Does it fit the shape of the Earth or is it more perfectly spherical? | I was reading about how Everest is the highest point above sea level, but Mount Chimborazo is the farthest point on Earth from the center. Does the atmosphere fit these bulges in the Earth's shape? Or does it fit as a sphere around Earth? If the atmosphere is perfectly spherical, the air at the top of Chimborazo would ... | askscience | https://www.reddit.com/r/askscience/comments/4kiz80/the_earth_is_an_oblate_spheroid_but_what_about/ | {
"a_id": [
"d3fdils"
],
"score": [
49
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"text": [
"The density profile of the atmosphere is fixed by the total force, gravitational + centrifugal. The Earth takes the shape it does, oblate spheroid, because most of it is really liquid and it flows until its surface is composed of points all at t... | [] | [] | [
[]
] | |
t8wmk | The Hindenburg disaster: The real cause for the decline of air travel by balloon? | This may be a dumb question but I'm curious. Did the Hindenburg disaster completely destroy the air balloon travel industry as the Wikipedia page indicates?_URL_0_
Was there more to it than that? (ex. Airplanes). I saw this article: _URL_1_ and thought it would be a fun and relaxing way to travel long distances. | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/t8wmk/the_hindenburg_disaster_the_real_cause_for_the/ | {
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"text": [
"There was way more to it actually. Airplanes didn't help. But the main thing actually is probably that Germany lost World War 2. During the war, Germany stripped down and scrapped all the big dirigible... | [] | [
"http://en.wikipedia.org/wiki/Hindenburg_disaster#cite_note-1",
"http://www.theatlantic.com/technology/archive/2012/05/the-dead-dream-of-the-dirigible/256758/"
] | [
[],
[],
[]
] | |
76eqwt | Is medieval portrayal of witches linked to anti-semitism? | I saw a [video on facebook](_URL_0_) that claimed that the portrayal of witches (pointy hats, hooked noses, horns, warts) were anti-semitic stereotypes that migrated to witches. How likely is this? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/76eqwt/is_medieval_portrayal_of_witches_linked_to/ | {
"a_id": [
"dodpsn2"
],
"score": [
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],
"text": [
"[This thread] (_URL_0_) with answer by u/TheLionHearted may interest you."
]
} | [] | [
"https://www.facebook.com/rackednational/videos/1816223081741209/?hc_ref=ART9Vudol9BUlOObWyr62tWoUsDJDRTfUqKAe9VQSKm8a0oyRqhnFJ6DXmvZuQw7YZs"
] | [
[
"https://www.reddit.com/r/AskHistorians/comments/70n3w9/when_did_the_classic_wizard_hat_first_appear_in/"
]
] | |
4y36ig | uptown vs downtown | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4y36ig/eli5_uptown_vs_downtown/ | {
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"text": [
"Downtown usually refers to the heavy financial and commercial are... | [] | [] | [
[],
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"https://en.wikipedia.org/wiki/Charlotte_center_city#Uptown_Charlotte"
],
[
"https://en.m.wikipedia.org/wiki/Uptown,_Dallas"
],
[],
[],
[]
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4crt9o | Can epigenetics alter the expression of traits dependent on genetic tract length? | For example, let's say that height (and length of all digits/limbs) was determined by the amount of repeats in a polyglutamine tract: 10 repeats of CAG is associated with height closer on average to six feet, whilst 5 repeats is associated with height closer on average to five feet and accordingly long limbs and digi... | askscience | https://www.reddit.com/r/askscience/comments/4crt9o/can_epigenetics_alter_the_expression_of_traits/ | {
"a_id": [
"d1lg8j2"
],
"score": [
2
],
"text": [
"Is there a reason you're asking about a 3 base pair repeat in particular? Variations in these kinds of repeats are usually associated with trinucleotide repeat syndromes, where having too many copies causes some sort of genetic syndrome. Huntingt... | [] | [] | [
[]
] | |
2la7ib | coal-fired power plants | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2la7ib/eli5_coalfired_power_plants/ | {
"a_id": [
"clsuhmx",
"clsuvbs"
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"score": [
11,
2
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"text": [
"Burn coal. Gets hot. Boils water. Spins turbine. Generates electricity. Exhaust heat used to preheat the water. Soot captured with sulfur compounds for emissions. Makes gypsum for drywall and plaster.",
"Source: Went to... | [] | [] | [
[],
[
"http://upload.wikimedia.org/wikipedia/commons/d/d6/Coal_power_plant_Datteln_2_Crop1.png"
]
] | ||
so10p | What is the next major evolutionary change the human race is most likely to undergo? | askscience | http://www.reddit.com/r/askscience/comments/so10p/what_is_the_next_major_evolutionary_change_the/ | {
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"c4fld67"
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"score": [
44,
2,
4,
3,
5,
2,
2,
2
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"text": [
"In evolution there is nothing \"major\". There is no intention, direction and purpose. Ther... | [] | [] | [
[],
[],
[],
[],
[],
[],
[],
[]
] | ||
8jqykp | Is there any evidence to show Shakespeare's actions and response to his son Hamnet's death? | How did he grieve? Was his son buried in a catholic or protestant manner? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/8jqykp/is_there_any_evidence_to_show_shakespeares/ | {
"a_id": [
"dz1zaro",
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"score": [
5,
2
],
"text": [
"Unfortunately we don't have much, if anything, to record Shakespeare's immediate emotional responses to his son's death; what we do have is rich grounds for speculation in the form of Shakespeare's plays. The impact of Hamne... | [] | [] | [
[
"http://www.nybooks.com/articles/2004/10/21/the-death-of-hamnet-and-the-making-of-hamlet/",
"https://www.poetryfoundation.org/poems/50665/on-my-first-daughter",
"https://www.poetryfoundation.org/poems/44455/on-my-first-son",
"http://www.shakespearedocumented.org/exhibition/document/parish-register... | |
6jk2xt | What would happen if an Astronaut in a spacestation with artifical gravity due to a spinning station would jump? | I just watched a sci-fi show with such a system and I came up with this question.
My problem here is as follows: The system works by using the centrifugal forces comming from the rotation of the wheel. So, everything that is speeded up to the speed of the wheel would feel artificial gravity. The problem is that the As... | askscience | https://www.reddit.com/r/askscience/comments/6jk2xt/what_would_happen_if_an_astronaut_in_a/ | {
"a_id": [
"djew1dz"
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"score": [
9
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"text": [
" > shouldn't the Astronaut when making a little jump [...] negate the effect of the spinning wheel\n\nNo. During the jump the astronaut will keep moving sideways due to inertia. Since the astronaut is moving in a straight line and the floor is m... | [] | [] | [
[]
] | |
8kfzme | how male animals know which young is theirs so they can protect it. | We know that animals can't connect sex with reproduction. So how do males understand that a child is theirs? If they cant connect sex with childbirth, they must be doing it for pleasure. We know that male lions kill others offspring when they take over a pride to put the females back into heat, but if they can't connec... | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/8kfzme/eli5_how_male_animals_know_which_young_is_theirs/ | {
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"dz7c9xw",
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"score": [
9,
8,
6,
2
],
"text": [
"They don't know. Many males of various species (like lions and gorillas) kill all the children once they rise to power, and they'll jealously and violently guard access to the fema... | [] | [] | [
[],
[],
[],
[]
] | |
24ah30 | is there a reason why humans have an arch in their feet or is it just from evolution? | Is there a reason why humans have an arch in their feet or is it just from evolution? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/24ah30/eli5_is_there_a_reason_why_humans_have_an_arch_in/ | {
"a_id": [
"ch56ast"
],
"score": [
5
],
"text": [
"Everything is \"just from evolution\".\n\nSo... yes and yes?\n\nArched feet are easier to support a body that stands upright (like humans do). It also gives space for muscle which can soften the blow of walking and can be more springy, which was... | [] | [] | [
[]
] | |
2d54vf | Does the human brain use any form of quantum entanglement? | I was watching through the wormhole earlier (s2 episode 1) and according to one of the scientists, the human brain uses quantum entanglement to help process information and it may also have something to do with consciousness. Does this have much standing in the scientific community? Why/why not? | askscience | http://www.reddit.com/r/askscience/comments/2d54vf/does_the_human_brain_use_any_form_of_quantum/ | {
"a_id": [
"cjm6ewk",
"cjm74mf",
"cjmkwgg",
"cjmt91f"
],
"score": [
47,
7,
2,
3
],
"text": [
"Probably not. You might want to read this article:\n\n_URL_0_\n\nThe abstract provides a very clear summary:\n\nWe argue that computation via quantum mechanical processes is irrel... | [] | [] | [
[
"http://cogsci.uwaterloo.ca/Articles/quantum.pdf"
],
[
"http://books.google.co.uk/books?id=FvRqtnpVotwC&pg=PA448&lpg=PA448&dq=dennett+quantum+brain+skyhook&source=bl&ots=cafyp_sW07&sig=-ptkg0j1CgPFhPvQaHxWY66Z94Q&hl=en&sa=X&ei=fnrnU7O5BoXA7Aa9xYGIDg&ved=0CCcQ6AE... | |
1ubh1x | Do you get any of the benefits of sleep from just lying still in bed with your eyes closed (as happens with insomnia)? | askscience | http://www.reddit.com/r/askscience/comments/1ubh1x/do_you_get_any_of_the_benefits_of_sleep_from_just/ | {
"a_id": [
"cegfw8p",
"cegrju2",
"cegy43s"
],
"score": [
113,
47,
4
],
"text": [
"There's some discussion of this in [this thread](_URL_1_) about a year ago. That thread prompted [an article on the subject in The Atlantic](_URL_0_). The conclusion from that article is:\n\n > \"... | [] | [] | [
[
"http://www.theatlantic.com/health/archive/2012/09/when-you-cant-sleep-how-good-is-lying-in-bed-with-your-eyes-closed/262484/",
"http://www.reddit.com/r/askscience/comments/zvcrz/if_a_person_lays_in_bed_eyes_closed_not_moving/"
],
[],
[]
] | ||
4wlwrp | why does putting food in a plastic bag prevent it from going stale? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4wlwrp/eli5_why_does_putting_food_in_a_plastic_bag/ | {
"a_id": [
"d680wun"
],
"score": [
4
],
"text": [
"Putting food in any container that doesn't allow air in will prevent food from going stale. Well, not *prevent*, but slow the process down. A plastic bag, when wrapped tight enough, does an okay job, but there are other, better things that work... | [] | [] | [
[]
] | ||
177t8x | How much energy is contained in the trace amounts of uranium in coal? | If you were somehow able to extract all of the uranium from a ton of coal, how much energy would it produce (in a nuclear reactor of course)? Would it be more than the coal itself? | askscience | http://www.reddit.com/r/askscience/comments/177t8x/how_much_energy_is_contained_in_the_trace_amounts/ | {
"a_id": [
"c830sva",
"c8310mh"
],
"score": [
11,
9
],
"text": [
"From [this page](_URL_0_) I have that the uranium content of coal is optimistically on the order of magnitude of 10ppm, depending on the source. Fissionable uranium, however, only makes up 0.71% of naturally occurring urani... | [] | [] | [
[
"http://www.ornl.gov/info/ornlreview/rev26-34/text/colmain.html",
"http://hypertextbook.com/facts/2006/LunChen.shtml"
],
[
"http://www.wolframalpha.com/input/?i=5+ug%2Fg+*+1+ton+*+.7%2F4+*+45+%28gigawatt+days%29+%2F+%28metric+tonne%29"
]
] | |
21l9nv | what's the limiting factor in how much memory companies like sandisk can make sd cards? | Alright, so I read back in February that SanDisk had released their first 128Gb micro SD card. I assume it goes a bit beyond just changing the packaging and price, but what's stopping a competitor from releasing a 256 GB card for half the price? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/21l9nv/eli5_whats_the_limiting_factor_in_how_much_memory/ | {
"a_id": [
"cge41ov"
],
"score": [
6
],
"text": [
"The circuits that make up the memory of the SD card take up a certain amount of space. Smaller components require more research time and more advanced manufacturing and so cost more money. Either 256 GB of memory cannot be made to fit or they wou... | [] | [] | [
[]
] | |
2jg5ht | I read that a large steel rod from orbit would hit a land target with the force of a small nuclear weapon. Does this mean it requires the energy of a nuclear weapon to get it into orbit? | I was reading the kinetic bombardment article of Wikipedia, and this does not make sense in my understanding of conservation of energy. | askscience | http://www.reddit.com/r/askscience/comments/2jg5ht/i_read_that_a_large_steel_rod_from_orbit_would/ | {
"a_id": [
"clbmakx",
"clbq2td"
],
"score": [
7,
6
],
"text": [
"Time for some algebra. Let's assume that figure is calculated as the sum of the gravitational potential energy and the kinetic energy. Fortunately for us the [Virial Theorem](_URL_1_) tells us that for bodies in gravitationa... | [] | [] | [
[
"http://www.nasa.gov/mission_pages/station/main/onthestation/facts_and_figures.html#.VEBhNvnF80I",
"http://en.wikipedia.org/wiki/Virial_theorem",
"http://en.wikipedia.org/wiki/Nuclear_weapon_yield"
],
[
"http://en.wikipedia.org/wiki/N1",
"https://www.youtube.com/watch?v=m79UO4HOQmc",
"... | |
2hrdah | How did English language names for other countries/cultures originate? | ...and why do they often differ from what said country/culture calls itself? For example, a person we call "German" from "Germany" would call themselves "Deutsch" from "Deutschland".
And even stranger is our terminology for Eastern nations. Ex: "Japan" and "Japanese" vs "Nihon" and "Nihon no".
Obviously some of thes... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/2hrdah/how_did_english_language_names_for_other/ | {
"a_id": [
"ckvbjq3"
],
"score": [
2
],
"text": [
"hi! there's room for responses covering more country names, but FYI, you can get started in the FAQ\n\n* [Why do countries have different names in other languages?](_URL_0_)\n\nand the /r/Linguistics FAQ \n\n* [Why are our names for countries so ... | [] | [] | [
[
"http://www.reddit.com/r/AskHistorians/wiki/language#wiki_why_do_countries_have_different_names_in_other_languages.3F",
"http://www.reddit.com/r/linguistics/wiki/histlingfaq#wiki_why_are_our_names_for_countries_so_different_from_what_the_people_call_their_own_country.3F"
]
] | |
4f7zh0 | Christianization after converting Europe to Christianity - What did it entail? | I am very interested in how Europe became "even more Christian" after already being converted to Christianity.
What I mean is not only syncretism of pagan and christian beliefs and lingering of old pagan traditions, something that the Christian clergy surely liked to pretend doesn't exist, but also how secular pratice... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/4f7zh0/christianization_after_converting_europe_to/ | {
"a_id": [
"d26szxd"
],
"score": [
5
],
"text": [
"From how I understand your blurb, what you're getting at is the increasing orthodoxy of Christianity in Europe, following the conversion process. \n\nAs regards England, conversion began in the late sixth century with Augustine's mission to Kent.... | [] | [] | [
[
"http://avalon.law.yale.edu/subject_menus/angsax.asp"
]
] | |
16fan6 | what is the difference between a bitmap and a vector image? | I don't understand the difference. Also, why can you make vectors way bigger and not have them get pixelated. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/16fan6/eli5_what_is_the_difference_between_a_bitmap_and/ | {
"a_id": [
"c7vhbcp",
"c7vhe3o",
"c7vht9o"
],
"score": [
10,
8,
2
],
"text": [
"Think of a bitmap image as a painting. It's a specific size, it has been created and each brush stroke is where it should be. If we were to take an image of that painting and stretch it out, it would s... | [] | [] | [
[],
[],
[]
] | |
co8pei | if they use the same caliber and are similar in function, why is the ar 15 not used by soldiers? what is its catch? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/co8pei/eli5_if_they_use_the_same_caliber_and_are_similar/ | {
"a_id": [
"ewgn77c",
"ewgne0e",
"ewgofrb"
],
"score": [
3,
4,
2
],
"text": [
"Because Armalite Arms did not get the contract to supply the US military",
"The core difference is in function.\n\nSpecifically, the M16 and M4 are capable of automatic and/or burst fire, which mean... | [] | [] | [
[],
[],
[]
] |
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