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 |
|---|---|---|---|---|---|---|---|---|---|
1k1l6a | Should Americans really be worried about radiation coming across the Pacific Ocean from Japan? | I've seen some very scary articles about this ever since the earthquake happened a while back. I question the validity of some of these websites. For the most part it sounds like the west coast of North America is in danger. Is it true that people are getting sick, infant mortality rates are up, food is contaminated, e... | askscience | http://www.reddit.com/r/askscience/comments/1k1l6a/should_americans_really_be_worried_about/ | {
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"text": [
"No. In fact, the [WHO found](_URL_0_) that even in Fukushima itself, the radiation levels were too low to affect fetal development. Risks of cancer went up slightly overall (4-7... | [] | [] | [
[
"http://apps.who.int/iris/bitstream/10665/78218/1/9789241505130_eng.pdf"
],
[],
[],
[]
] | |
95d81p | how does discord make money if they have no advertisements? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/95d81p/eli5_how_does_discord_make_money_if_they_have_no/ | {
"a_id": [
"e3rrmot",
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"score": [
2,
11,
10
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"text": [
"\"If you aren't the consumer, you're the product.\"\n\nWith a lot of new tech companies, market share is more important to investors than income. Snapchat is burning money but the stock is valued so h... | [] | [] | [
[],
[],
[]
] | ||
25xo1b | - what are vpns and what kind of magic makes them unblock restricted websites and stuff? | A classmate of mine uses a VPN to access blocked sites at my college sometimes but am wondering how exactly this works. Can anyone explain how it does that and how I can use one? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/25xo1b/eli5_what_are_vpns_and_what_kind_of_magic_makes/ | {
"a_id": [
"chlp43z",
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"score": [
3,
73,
3
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"text": [
"A VPN or Virtual Private Network is a network connection that enables you to create a secure connection over Internet. With a VPN, all network traffic (data, voice, and video) goes through a secure vir... | [] | [] | [
[
"http://imgur.com/zfS9uPE",
"http://www.youtube.com/watch?v=FCS6ATvKVF0"
],
[],
[]
] | |
ant93h | how do rocket engines not crush themselves under their own thrust? | Rocket engines look relatively delicate, and seem like they are mostly thin metal and empty space to allow room for combustion and fuel/oxidizer flow, yet they put out thrust in the 100s of tons, how do they not crush themselves under their own trust? Are they actually more robust than they look, or are there other hid... | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/ant93h/eli5_how_do_rocket_engines_not_crush_themselves/ | {
"a_id": [
"efvt560",
"efvtbq3",
"efvu13d"
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"score": [
5,
18,
3
],
"text": [
"They are often times made out of extremely strong and robust exotic metals like titanium alloys or [Inconel.](_URL_0_)\n\nIn short, super duper strong and well engineered.",
"They are actually just... | [] | [] | [
[
"https://en.wikipedia.org/wiki/Inconel"
],
[],
[]
] | |
z8wge | Growing Universe? | People say that universe is constantly growing in size. Is this true? If so, how is this possible when there are laws like conservation of mass and conservation of energy? | askscience | http://www.reddit.com/r/askscience/comments/z8wge/growing_universe/ | {
"a_id": [
"c62hqqs"
],
"score": [
2
],
"text": [
"The universe is not growing, it is expanding.\n\nNew matter is not being created. The distance between existing matter is just increasing at large scales. As far as we can tell, this is just a property of space."
]
} | [] | [] | [
[]
] | |
5gcfci | why do galaxies form in clusters rather than spread out from one another? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/5gcfci/eli5_why_do_galaxies_form_in_clusters_rather_than/ | {
"a_id": [
"dar4j9k"
],
"score": [
2
],
"text": [
"Because after the Big Bang matter clumped in certain areas of higher density due to gravity. These clumps would become Galaxy Clusters. They in turn would clump up even more and the resulting smaller clumps would become galaxies. Note that Galaxy... | [] | [] | [
[]
] | ||
916o9z | how is it possible to see a star that might’ve exploded thousands of years ago? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/916o9z/eli5_how_is_it_possible_to_see_a_star_that/ | {
"a_id": [
"e2vqtbi",
"e2vqvqe",
"e2vqvt1",
"e2vqyfa",
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3,
7,
2,
2
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"text": [
"Light takes time to reach us. \n\nA star that is a million light years away may have exploded a thousand years ago, but the light carrying that information h... | [] | [] | [
[],
[],
[],
[],
[]
] | ||
490j50 | how does the military determine when someone gets deployed overseas? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/490j50/eli5_how_does_the_military_determine_when_someone/ | {
"a_id": [
"d0o71wj",
"d0o9bj3"
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"score": [
2,
4
],
"text": [
"In the Navy you get stationed on a ship. Ships go through alternating cycles of maintenance, training and then deployment. If you're stationed on the ship and it deploys you go with it. Small ships deploy for six months e... | [] | [] | [
[],
[]
] | ||
8zcgtp | why does it seem that people with mental disabilities are happier than those who don't? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/8zcgtp/eli5_why_does_it_seem_that_people_with_mental/ | {
"a_id": [
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"score": [
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"text": [
"It some instances, maybe they're not and simply cannot communicate. But for the rest, probably because they will never have the same worries and responsibilities. Many will be ... | [] | [] | [
[],
[],
[],
[]
] | ||
1x3l3p | Do we actually LEARN to walk, or do we ACQUIRE THE ABILITY to walk as our brains continue to develop? | In most(?) species, newborns begin walking right away, so that's clearly not a learned behavior. I also know that humans are born with a LOT of neurological development still to occur.
So... do human children actually *learn* to walk, or is more accurate to say they start to walk as the necessary neurological wiring ... | askscience | http://www.reddit.com/r/askscience/comments/1x3l3p/do_we_actually_learn_to_walk_or_do_we_acquire_the/ | {
"a_id": [
"cf7zki2"
],
"score": [
18
],
"text": [
"Humans are born with a walking reflex that serves as the basis for walking behavior. Applying pressure to the bottom of the foot will cause the same leg to extend and the other leg to swing forward. Like many reflexes, this is based on nerves tr... | [] | [] | [
[]
] | |
10qfn7 | Given the evolution of language over time, if I were to step into a time machine and come out 10,000 years in the future, what are the odds that I could understand what anyone is saying? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/10qfn7/given_the_evolution_of_language_over_time_if_i/ | {
"a_id": [
"c6fqv6x"
],
"score": [
6
],
"text": [
"Extremely unlikely. As far as I know, there are no languages being spoken today which were spoken 10,000 years ago.\n\nHowever, things are different now. We now have recordings of how people speak. This is a very recent development, comparatively... | [] | [] | [
[
"http://www.reddit.com/r/linguistics"
]
] | ||
37au3q | During the German occupation of France did soldiers pay businesses money for goods and services or was it just expected that they would get them for free? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/37au3q/during_the_german_occupation_of_france_did/ | {
"a_id": [
"crl5jp8",
"crl89w0"
],
"score": [
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14
],
"text": [
"Generally speaking they paid money for goods and services, though to be perfectly clear they paid with French money collected via taxes in France. As a general policy of Nazi Germany occupation costs were transferred to th... | [] | [] | [
[],
[]
] | ||
76kn6r | can people have smaller than average organs and what does it mean? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/76kn6r/eli5_can_people_have_smaller_than_average_organs/ | {
"a_id": [
"doer7dg"
],
"score": [
8
],
"text": [
"If you made it this long with little to no problems, I wouldn't worry about it.\n\nBest thing to do is talk to your doctor about it. She would probably feel bad if she knew what she said made you uncomfortable and she didn't know/therefore could... | [] | [] | [
[]
] | ||
22keic | why are rooms with higher ceilings cooler than those with lower ones? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/22keic/eli5_why_are_rooms_with_higher_ceilings_cooler/ | {
"a_id": [
"cgno7kp",
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],
"score": [
9,
2
],
"text": [
"Hot air rises. A tall room can hold more hot air before it gets to the level where you can feel it.",
"Warm air rises. Cool air falls. It's a density thing based on temperature. The taller the room, the more separation a... | [] | [] | [
[],
[]
] | ||
4m7yji | [NSFW] What is the earliest reference we have to non-vaginal intercourse? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/4m7yji/nsfw_what_is_the_earliest_reference_we_have_to/ | {
"a_id": [
"d3u1s9g"
],
"score": [
4
],
"text": [
"There must be something in the air. Just two days ago, /u/tjdraws asked a similar question and we got loads of answers from all over the world at _URL_0_ \n\nOf course, there's always room for more information...\n"
]
} | [] | [] | [
[
"https://www.reddit.com/r/AskHistorians/comments/4lyy9e/was_oral_sex_an_invention_of_modern_western/"
]
] | ||
1emd6f | Why did Jell-o get so popular in the 1970s, especially as a savory dish? | Inspired by [this](_URL_0_) and many other similar posts I've seen. It just...doesn't make sense to me. Was there a reason? Was Jell-o *actually* popular to serve, or just equipped with a creative marketing team? Is there a location component (US vs Europe, I would guess)? Google has been less than helpful. | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1emd6f/why_did_jello_get_so_popular_in_the_1970s/ | {
"a_id": [
"ca1me64",
"ca1rquk"
],
"score": [
2,
17
],
"text": [
"I remember there was a segment on Unwrapped about Jello. \n\n\nI can't find the video anywhere online, but I remember part of it saying when it came around in the 70's, it's popularity was partially because of how simple it... | [] | [
"http://www.buzzfeed.com/briangalindo/10-regrettable-retro-food-recipes"
] | [
[],
[
"http://books.google.com/books?id=CFdcCy_AYAkC&printsec=frontcover#v=onepage&q&f=false",
"http://medievalcookery.com/recipes/gelye.html",
"http://books.google.com/books?id=OO7NVyLhiSYC&pg=PA59&source=gbs_toc_r&cad=4#v=onepage&q&f=false",
"http://www.culinaryin... | |
71knyt | If sea level is rising, why are the beaches I know still the same size and shape? | It seems pretty clear that sea level is rising (3mm a year):
_URL_0_
That being the case, shouldn't that be obvious when looking at beaches and other coastlines?
All the coastlines I know well (Northern Europe) haven't noticeably changed in the last 20 years and looking at old photos, haven't changed in over 100.
I co... | askscience | https://www.reddit.com/r/askscience/comments/71knyt/if_sea_level_is_rising_why_are_the_beaches_i_know/ | {
"a_id": [
"dnbln8u"
],
"score": [
33
],
"text": [
"Couple of things. \n\n1) For Northern Europe, depends a lot on where you are. Throughout Northern Europe, a lot of the crust is still [responding isostatically to the removal of large ice sheets](_URL_2_), so in some portions of Northern Europe ... | [] | [
"https://oceanservice.noaa.gov/facts/sealevel.html"
] | [
[
"http://www.whoi.edu/oceanus/feature/rising-sea-levels-and-moving-shorelines",
"http://cdn.antarcticglaciers.org/wp-content/uploads/2012/09/milne_shennan_fig11.png",
"http://www.antarcticglaciers.org/glaciers-and-climate/sea-level-rise-2/recovering-from-an-ice-age/",
"https://clasticdetritus.files... | |
4io4u6 | Guy Fawkes name is bandied about a lot in the plot of blowing up the UK Parliament in the early 1600s, however, who were the true masterminds of this plot and why is Guy Fawkes alone synonymous with this plot to the extent that there is a Guy Fawkes day as well? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/4io4u6/guy_fawkes_name_is_bandied_about_a_lot_in_the/ | {
"a_id": [
"d2zoq9z"
],
"score": [
11
],
"text": [
"The true leaders of the plot were Robert Catesby (1572-1605) a Warwickshire gentleman, and Thomas Percy (1560-1605) a member of the Percy family of northern nobles. Both of them were killed at the siege of Holbeche House in Staffordshire in a sh... | [] | [] | [
[]
] | ||
abk682 | When was the first 'reboot' of an old film? Have there been trends of rebooting films in the past or is it mostly a modern phenomenon? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/abk682/when_was_the_first_reboot_of_an_old_film_have/ | {
"a_id": [
"ed26mor",
"ed28hvy"
],
"score": [
12,
3
],
"text": [
"While ‘rebooting’ is a new term, remaking classic stories in a new medium is hardly new. \n\nFor example look at the history of Les Miserable in American medium. Though only published in novel 1862 by 1897, ‘Victor Hugo et ... | [] | [] | [
[],
[]
] | ||
3vvvd8 | Who's the earliest person to have been written about in history? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/3vvvd8/whos_the_earliest_person_to_have_been_written/ | {
"a_id": [
"cxrewzo"
],
"score": [
2
],
"text": [
"/u/stonedeye answered this one a while back in [this thread](_URL_0_)"
]
} | [] | [] | [
[
"https://www.reddit.com/r/AskHistorians/comments/21jjpq/who_is_the_oldest_person_known_to_mankind/"
]
] | ||
gyi4y | If a photon experiences no time, could all photons we observe from our reference frame really just be the same photon in every possible position in the universe? | I'm a photon/relativity noob, so please excuse my ignorance. I often wonder about the fact that an object that moves at c experiences no time. Does this not imply that a) from our reference frame the same photon must be at every conceivable point in the universe simultaneously, and that b) there is just one single phot... | askscience | http://www.reddit.com/r/askscience/comments/gyi4y/if_a_photon_experiences_no_time_could_all_photons/ | {
"a_id": [
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"c1r8hn3",
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],
"score": [
27,
11,
9,
6,
30,
29
],
"text": [
"Sounds like Feynmann's [one-electron universe hypothesis](_URL_1_). More information [here](_URL_0_).\n\nBased purely on the fact th... | [] | [] | [
[
"http://cheatingtheferryman.blogspot.com/2007/10/feynmans-one-electron-universe-theory.html",
"http://en.wikipedia.org/wiki/One-electron_universe"
],
[],
[],
[],
[],
[]
] | |
19las0 | how us govt. enforces that all children go to school (public, private, charter, etc) | How does the government ensure that children go to school, especially those that do not go to public schools. Also, how does homeschooling work legally. Are there certain criteria that make schools 'schools' by govt.? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/19las0/eli5_how_us_govt_enforces_that_all_children_go_to/ | {
"a_id": [
"c8p2qgb"
],
"score": [
4
],
"text": [
"The US government doesn't really get involved; it's a state level thing, and each state of the US does it differently."
]
} | [] | [] | [
[]
] | |
7nmah7 | [Human Body] Are 'fast twitch' muscle fibers anatomically larger in size than 'slow twitch' ones? | In my limited understanding of the human skeleto-muscular system I am aware there are 2 types of muscle fibers.
Fast twitch: Develop from sprint-like exercise such as running sprints, 50m swimming races, lifting heavy weights close to your maximum limit etc.
Slow twice: Develop from endurance exercise such as long d... | askscience | https://www.reddit.com/r/askscience/comments/7nmah7/human_body_are_fast_twitch_muscle_fibers/ | {
"a_id": [
"ds2x8iw",
"ds481ga"
],
"score": [
44,
3
],
"text": [
"I actually just graduated with a degree in Kinesiology, so it's good to see it be somewhat useful. The shortest answer is yes, FT muscle cells that have been exercised will be larger than slow twitch. It's the whole idea th... | [] | [] | [
[],
[
"http://www.andygalpin.com"
]
] | |
55ucgd | Do the upper most limits of the atmosphere display surface tension? | I always assumed that objects skipping off our atmosphere was similar to a stone skipping off the surface of a pond. I thought since gasses and liquids are both fluids they may display similar properties in this area. However I started thinking maybe objects skipping off the atmosphere is less a result of surface ten... | askscience | https://www.reddit.com/r/askscience/comments/55ucgd/do_the_upper_most_limits_of_the_atmosphere/ | {
"a_id": [
"d8dv4aq",
"d8dw7kg"
],
"score": [
3,
4
],
"text": [
"An ideal gas is assumed to have no intermolecular/interatomic forces (i.e. gas particles neither repel nor attract each other), so there is no surface tension. \n\nYou're right to be skeptical of surface tension as the fact... | [] | [] | [
[],
[]
] | |
sx9xh | Poison Ivy, Oak, Sumac Immunity? Is it possible? | askscience | http://www.reddit.com/r/askscience/comments/sx9xh/poison_ivy_oak_sumac_immunity_is_it_possible/ | {
"a_id": [
"c4hqv3n",
"c4hra6t",
"c4hribq"
],
"score": [
3,
4,
3
],
"text": [
"yes it is completely possible. it is actually not being immune per-say, its just that you are not allergic as most of the population is. I'm like you i do not get poison ivy, or oak. do not know about ... | [] | [] | [
[],
[
"http://en.wikipedia.org/wiki/Toxicodendron_radicans",
"http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0003396/"
],
[
"http://en.wikipedia.org/wiki/Urushiol",
"http://www.zanfel.com/help/"
]
] | ||
7g0ur5 | How was Caesar's "Gallic War" created and distributed? | Did Caesar write it out himself, or dictate to a scribe? Were there publishers who would take in his manuscript, have it copied, and sell the copies for a profit, or did he have to arrange the copies and distribution himself? How many copies were made, and how did they get into the hands of the audience? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/7g0ur5/how_was_caesars_gallic_war_created_and_distributed/ | {
"a_id": [
"dqg2we2"
],
"score": [
24
],
"text": [
"There are really a few questions here, some of which have no definite answer and others of which only have partial answers. In the first place, how were books published in the Roman world? In the second, how were they distributed? And finally, h... | [] | [] | [
[]
] | |
33bxkw | how do windows/glass reflect light if it's sole purpose is to let light through? | I'm on a bus for example and if I look at the windows I can see the seats reflecting in the window but also through the window. Or another example would be when you see your car or yourself in store windows. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/33bxkw/eli5_how_do_windowsglass_reflect_light_if_its/ | {
"a_id": [
"cqjfq9l"
],
"score": [
5
],
"text": [
"This happens because although windows are designed to let light through, they are not perfect. Glass lets through the vast majority of light, but always reflects some of it back.\n\nSo why don't we always see a reflection?\n\nWell, the percentage... | [] | [] | [
[]
] | |
5jxmyx | How far back in history would a current high school graduate have to go to be considered a leading expert in the various scientific fields, based on today's typical high school curriculum? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/5jxmyx/how_far_back_in_history_would_a_current_high/ | {
"a_id": [
"dbk9dq5",
"dbk9fhk",
"dbknnso"
],
"score": [
21,
129,
6
],
"text": [
"Or, given the number of things humans have believed throughout history that turned out to be wrong: how far back in history would a current high school graduate have to go to have a better understand... | [] | [] | [
[],
[],
[]
] | ||
e5vsa6 | how are sounds in video games and movies made from complete scratch? | [deleted] | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/e5vsa6/eli5_how_are_sounds_in_video_games_and_movies/ | {
"a_id": [
"f9m84u4"
],
"score": [
8
],
"text": [
"Many of them will be pre-recorded and just saved into a pack that can be dragged and dropped in. The rest will be Foley sound which is just recording something that sounds like the action in a sound proof room. Off the top of my head the only one... | [] | [] | [
[]
] | |
7tjryw | Thinking about the umbilical cord, at what point is it the mother's DNA and at what point is it the baby's DNA? Is there a point where they're mixed? | askscience | https://www.reddit.com/r/askscience/comments/7tjryw/thinking_about_the_umbilical_cord_at_what_point/ | {
"a_id": [
"dtd64oo",
"dtd7qef"
],
"score": [
9,
31
],
"text": [
"I think a similar question was asked a few years ago — > [Umbilical cord](_URL_0_) ",
"The umbilical cord is entirely the baby’s tissue. But the placenta is the interface between the fetal bloodstream and the mother’s i... | [] | [] | [
[
"https://www.google.co.uk/amp/s/amp.reddit.com/r/askscience/comments/2jlnth/are_the_umbilical_cord_part_of_the_mother_or_the/"
],
[]
] | ||
426n1b | What is the best way to learn about the American Civil War for a non-american? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/426n1b/what_is_the_best_way_to_learn_about_the_american/ | {
"a_id": [
"cz836fv",
"cz8d44p",
"cz8inf0"
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"score": [
6,
3,
4
],
"text": [
"I'm afraid my advice is rather conventional. If you are really wanting to get a proper understanding of the war, or of any aspect of history, you won't find it in movies, websites, video games, or docum... | [] | [] | [
[],
[],
[]
] | ||
4bmsxu | in 2014, drunk driving absolutely dwarfed the statistics for terrorism (accounting for american blood spilled.) if was able to find these statistics on the internet within seconds, then why do we still have people believing that terrorism is the highest priority on american soil? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4bmsxu/eli5_in_2014_drunk_driving_absolutely_dwarfed_the/ | {
"a_id": [
"d1aipvi",
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"d1ajzgj"
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"score": [
3,
3,
2,
2
],
"text": [
"The answer, interestingly, is in your original question:\n\n > If was able to find these statistics on the internet within seconds\n\nMost people don't go looking. They react to i... | [] | [] | [
[],
[],
[],
[]
] | ||
3sjcql | When did the word "mad" start to mean angry/upset rather than crazy in the US? | I remember being a kid and reading Harry Potter and started noticing that they had a character called "Mad-Eye" Moody and they would call people mad when they thought they were going crazy. This was new way to use this word for me and I always thought it was weird.
When (at least in the US) did mad become angry? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/3sjcql/when_did_the_word_mad_start_to_mean_angryupset/ | {
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"This is sense 6b in the Oxford English Dictionary under \"mad\" (adj.):\n\n > Angry, irate, cross. Also, in weakened sense: annoyed, exasperated (with †against, at, with, etc.). Now colloq. (chiefly N. Amer.) and Brit. regional.\n\nThe earliest c... | [] | [] | [
[]
] | |
656965 | what makes it so difficult to cure paralysis? | Is there many parts to the equation that we cannot solve? Is there some that we can? Will we ever be able to cure it? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/656965/eli5_what_makes_it_so_difficult_to_cure_paralysis/ | {
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"Nerves do not regenerate the way other cells do. Nerves when cut quickly close themselves off to the matrix outside of the cell, and can grow back a little bit, but we don't see nerves re-fusing together frequently. If we ... | [] | [] | [
[],
[]
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cler8r | how far do the atoms in a rubber band stretch (separate) in relation to each other compared to the atoms in, say, a steel bar when you pull on it? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/cler8r/eli5_how_far_do_the_atoms_in_a_rubber_band/ | {
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8glj8f | what is the difference between a negative control and a positive control in experiments? | i've never understood the difference | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/8glj8f/eli5_what_is_the_difference_between_a_negative/ | {
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1a84wp | what is the business sense of walgreens, cvs and rite aid all being on the same street corner? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1a84wp/eli5_what_is_the_business_sense_of_walgreens_cvs/ | {
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1s37e6 | How does my TV know which pixel to light up? | It seems the internet is filled with explanations as to how a pixel works but no explanation regarding how the TV knows which to light up. I imagine new TVs have an easier explanation than the old cathode tube TVs. I would like an explanation of both please.
Edit:
Thanks for the replies...regarding the CRT, how can t... | askscience | http://www.reddit.com/r/askscience/comments/1s37e6/how_does_my_tv_know_which_pixel_to_light_up/ | {
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npaut | How are quantum mechanical wave function collapse and the second law of thermodynamics related? | From what I gather, these are the only two reversible physical processes we know of, and therefore they have the ability to indicate the arrow (direction) of time.
I have heard entropy increase described as a large number of measurements causing wave-function collapse, but I've also heard that entropy increase/other ... | askscience | http://www.reddit.com/r/askscience/comments/npaut/how_are_quantum_mechanical_wave_function_collapse/ | {
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"I think I've studied enough quantum informat... | [] | [] | [
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46rup3 | Why do we have separate systems for myelination of the central and peripheral nervous systems? | I assume it has a reason due to evolution, but all I can find with google are differences between oligodendrocytes and schwann cells. I can't find anything about why they are separate systems.
Thanks! | askscience | https://www.reddit.com/r/askscience/comments/46rup3/why_do_we_have_separate_systems_for_myelination/ | {
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79wxdr | how did hitler manage to give so many people a job, building the army, the luftwaffe, the autobahn and many more at a time when the whole world suffered an economical crisis? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/79wxdr/eli5_how_did_hitler_manage_to_give_so_many_people/ | {
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"Well first off, the economy was already recovering before Hitler came to power. So he was given a better hand than just the flat out mega depression.\n\nSecond is that they basically did what the US did during the era but on... | [] | [] | [
[],
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2u9ykn | does shaving with a razor on your legs dull the razor faster than using it on your face? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2u9ykn/eli5does_shaving_with_a_razor_on_your_legs_dull/ | {
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4k87so | Are there reported instances of PTSD or psychological trauma caused by violence amongst proto-agricultural Native American tribes or other proto-agricultural or hunter gatherer societies? | [Sebastian Junger makes the claim](_URL_0_) that currently reported PTSD in veterans is related more to the return to a cold and selfish society from a life in which one is highly interdependent and feels an indispensable part of their in-group.
This claim is predicated on the fact that psychological trauma is not th... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/4k87so/are_there_reported_instances_of_ptsd_or/ | {
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"Speaking for the Cayuse: Symptoms of what is now called PTSD isn't present in accounts that concern warfare and warriors. War was considered more of a sport for the Cayuse than something to be dreaded (this isn't an uncommon view among other Amer... | [] | [
"http://www.vanityfair.com/news/2015/05/ptsd-war-home-sebastian-junger"
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[]
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4j1vaj | How well developed were the roads circa 300 BC India - Mauryan Empire ? | Some background : I was going through the TV channels and saw a show about Ashoka, in the scene where I stopped, a girl was walking on a very modern looking, metalled road.
---
My questions:
- That was a glitch right? Or were there really metalled roads during that time period?
- If no, then what were the transpor... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/4j1vaj/how_well_developed_were_the_roads_circa_300_bc/ | {
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"No, the show you saw was wrong. I suspect it was the popular Indian TV series on Ashoka, which is a soap opera set in ancient times, not a historical work. Archaeological records show that Indian roads at the time were paved with stone, typically... | [] | [] | [
[]
] | |
3o7jks | what happens when a us state losses a representative in the house due to population decrease? | Is the newest member just out of a job? Do they not even run? What happens? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/3o7jks/eli5what_happens_when_a_us_state_losses_a/ | {
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"Essentially it's like this, imagine a state with 3 equal districts, each have a candidate representing it.\n\n [ Bob | John | Anna]\n\nIn the next elections they lose a representative due to a population shift. Bob will likely still run for h... | [] | [] | [
[]
] | |
1vro5w | why is canada's leader, stephen harper, supporting israel so enthusiastically lately? | The Canadian press are all over it, with some really seeming to side with him (Toronto Star). Is it really that bad for Israelis that they need such foreign involvement, or are there other factors at play? I don't support either side in this issue, but things seem to be getting a little weird seeing as Harper doesn't u... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1vro5w/why_is_canadas_leader_stephen_harper_supporting/ | {
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"* Israel doesn't really need Canadian support.\n\n* It's good for Harper politically. To the best of my knowledge, the Conservatives & religious people in Canada are pretty pro-Israel, just like in America.\n\n* Reddit is pretty anti-Israel. A ... | [] | [] | [
[]
] | |
5wilux | why does walking on wet sand leave dry footprints? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/5wilux/eli5_why_does_walking_on_wet_sand_leave_dry/ | {
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"When you step you compress the space between the sand particles. This forces the water that was occupying the spaces out. When you lift your foot, the sand remains more compact than it was before. Also water is cohesive. It likes to stick to itse... | [] | [] | [
[]
] | ||
22mvmn | How do we track a spacecraft in interplanetary space? | For example the probes sent to Mars, how do we know where they are at any given time in their journey? | askscience | http://www.reddit.com/r/askscience/comments/22mvmn/how_do_we_track_a_spacecraft_in_interplanetary/ | {
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"There are a number of ways, such as triangulation via radio waves, the probe having a star finder, and inertial guidance systesms which report back. Also measuring doppler shift to guage velocity relative to us. Correcting for doppler shift is im... | [] | [] | [
[]
] | |
a3dd0c | What were the primary motivations for Danish Vikings to invade and settle in England starting at the end of the 8th century? | I’ve been watching the Last Kingdom on Netflix, it’s making me curious about that entire period of English history. Thanks in advance for any responses! | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/a3dd0c/what_were_the_primary_motivations_for_danish/ | {
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"So a clarification question, are you more interested in settlement and invasion or the earlier raids marked as starting by the attack on Lindisfarne? There were was over 50 years from the first raids on England to the arrival of the Micel Here a... | [] | [] | [
[]
] | |
5l3bjf | AskScience AMA Series: I'm /u/OrbitalPete, a volcanologist who works on explosive eruptions, earthquakes, and underwater currents. Ask Me Anything! | /u/OrbitalPete is a volcanologist based at a university in the UK. He got his PhD in 2010, and has since worked in several countries developing new lab techniques, experiments, and computer models. He specialises in using flume experiments to explore the behaviour of pyroclastic density currents from explosive eruption... | askscience | https://www.reddit.com/r/askscience/comments/5l3bjf/askscience_ama_series_im_uorbitalpete_a/ | {
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1sdw6v | How does gender as an analytical concept advance our understanding of history? | I'm very aware that women have traditionally been excluded or denigrated in past historical narratives. I can also see the massive value of analysing the role and perception of women in any society you study. But how does the does analysing a subject in terms of gender as a social construct advance our understanding? D... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1sdw6v/how_does_gender_as_an_analytical_concept_advance/ | {
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"Do you mean gender history or women's history? The two are commonly conflated, partly because in order to appeal more to mainstream academics the burgeoning movement of women's history academics branded it the less overtly p... | [] | [] | [
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"http://31.media.tumblr.com/tumblr_kxrt4uKSYW1qb50y9o1_500.jpg"
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"http://www.reddit.com/r/AskHistorians/comments/1s60ec/theory_thursday_academicprofessional_history/cdu90jh",
... | |
32hx92 | Is it known what the Romans and Anglo-Saxons thought of pre-occupation British sites such as Stonehenge? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/32hx92/is_it_known_what_the_romans_and_anglosaxons/ | {
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"Both Anglo-Saxons and Romans recognized that time had a lot of depth, though precisely how old ruins were, and who built them, wasn't always clear. Some Roman authors like Lucreti... | [] | [] | [
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1lacm5 | If you could take the average of all the temperatures of everything that exists in the world, would it always be the same? | So I understand temperature to work as something that is never created or destroyed. Just something that transfers itself. So if I had two objects and nothing else existed. If one was 5 degrees and the other 35 degrees the average would be 20 degrees. If the hotter object cooled down to 15 degrees (assuming that nothi... | askscience | http://www.reddit.com/r/askscience/comments/1lacm5/if_you_could_take_the_average_of_all_the/ | {
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[]
] | |
59ddt7 | why isn't digital signature forgery a bigger problem? | I know the insignificance of the scribbled mark on the "page" (or the digital Adobe document): _URL_0_
... and that the true significance of a signature is to demonstrate that you were physically present at the time to make the mark.
How, then, do digital signature programs work, and why isn't forgery a way bigger is... | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/59ddt7/eli5_why_isnt_digital_signature_forgery_a_bigger/ | {
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"They're not really safe or easy to verify, but neither are actual signatures. The signature is just supposed to be an indication that you read the document and approve it; it's not some foolproof method of guaranteeing you'r... | [] | [
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[],
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] | |
93zykg | How reliable is the Old Testament's accounts of Judah and Israel? | barring the more miraculous events, how accurately does it cover the reign of kings, etc | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/93zykg/how_reliable_is_the_old_testaments_accounts_of/ | {
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"There are a couple of schools of thought here. There is the Minimalist school, that really discounts a vast amount of the account. They only consider those parts that can be proven by archeological evidence to be accurate, and even then, only if ... | [] | [] | [
[]
] | |
3ct1ne | how can events in dreams provide context for events and stimuli that occur in the real, physical world? | Basically, I've had dreams where I'm doing something, or something happens to me, and then something in the real world happens that seemingly perfectly lines up with what I was dreaming. For instance, say I'm dreaming that I'm about to walk into a concert hall, and then once I open the doors, I'm showered with the musi... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/3ct1ne/eli5_how_can_events_in_dreams_provide_context_for/ | {
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"It is usually a coincidence. You didn't notice all the times when it didn't match (you usually have multiple dreams every night, but you forget them). The one time that a super coincidence happened you think that it is reall... | [] | [] | [
[],
[]
] | |
20s3o6 | Could a nuclear winter lead to an ice age? | If there was a nuclear war that suddenly destroyed most of the worlds major cities, would the effect of a nuclear winter be severe enough and last long enough to lead to an ice age? If so, how long would it take and how long would it last? | askscience | http://www.reddit.com/r/askscience/comments/20s3o6/could_a_nuclear_winter_lead_to_an_ice_age/ | {
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"According to this [excellent study] (_URL_0_) (pdf) about nuclear winter, a large nuclear war would cool global temperatures by 7-9 C, which is more than happened during the global ice age of 18,000 ye... | [] | [] | [
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"http://en.wikipedia.org/wiki/Toba_catastrophe_theory",
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3jb7ba | Are there any surviving examples of great helmets pre-14th century? | When I search for any later Medieval helmets (e.g. different bascinets, frogfaces, armets, etc.) there's many that were actually made 600-500 years ago, in comparison to great helmets. The only one I've seen is a german winged one made in the 1400s as a ceremonial helmet. I've seen more examples of viking helmets that ... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/3jb7ba/are_there_any_surviving_examples_of_great_helmets/ | {
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"Yes, there is a [13th century great helm in the Deutsches Historiches Museum](_URL_1_) - originally found in Schlossberg bei Dargen, Pomerania. Claude Blair and others date it to the second half of the 13th century. Note that unlike earlier grea... | [] | [] | [
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"http://www.nms.ac.uk/explore/collections-stories/art-and-design/pembridge-helm/",
"https://commons.wikimedia.org/wiki/Category:Great_helm?uselang=it#/media/File:Ancient_German_armour_helmet.jpg"
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bavhql | since we will eventually hit a wall of reducing the size of transistors on a computer processor, what else can we do to improve its performance? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/bavhql/eli5_since_we_will_eventually_hit_a_wall_of/ | {
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1zmakb | how do muscles regenerate between sets of an excercise? | Let's say I'm doing bench press. I've done 10 full reps, the 11th one I can barely push barbell an inch from my chest - I'm exhausted. Then I wait about 2 minutes and start second set, where I can lift at least another 7-8 times no problem. What happens with muscles during that 2 minute break? How do they regenerate so... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1zmakb/eli5_how_do_muscles_regenerate_between_sets_of_an/ | {
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"Energy for you muscles to contract comes from burning sugar (glucose). Afterwards there is burnt sugar (pyruvate) left over that prevents more sugar from coming in to get burned. If there is enough oxygen (aerobic) the burnt sugar can be whiske... | [] | [] | [
[]
] | |
43wmge | how can sugar/sugar based things like candies go so long without spoiling but eating sugar and not brushing your teeth causes bacteria to flourish? or fermenting alcohol for that matter, why do bacteria like sugar sometimes? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/43wmge/eli5_how_can_sugarsugar_based_things_like_candies/ | {
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"Highly concentrated sugar creates an environment toxic to bacteria. Once you dilute it with some water, it's food for them.",
"Bacteria thrive in a warm, humid, dark environments, like the inside of... | [] | [] | [
[],
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3m5q0y | why do astronauts not experience the effects of being in an anechoic chamber in space? | Supposing the astronaut isn't breathing heavily, speaking, or receiving a voice message.
EDIT: In the vacuum of space (i.e. spacewalk), not in a spacecraft/station.
Anechoic Chamber:
_URL_0_ | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/3m5q0y/eli5_why_do_astronauts_not_experience_the_effects/ | {
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"text": [
"Apparently, it's crazy loud in the ISS, to the point that it can cause issues with sleeping. Reason being, they're living inside a giant machine that has all types of systems going 24/7...AND there is no atmosphere or attached ground to dampen, ... | [] | [
"https://www.youtube.com/watch?v=aa_1Galj3nI"
] | [
[]
] | |
21ceap | How much do we know about Marco Polo's journeys? | Hey guys,
I was reading Mark Kurlansky's Salt earlier today, and he briefly goes into the topic of the Polos' journeys into China, and mentions that, while Marco Polo (at least, in the version of his journeys that was known) talked about several things unique to China at the time (such as salt cakes being used as money... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/21ceap/how_much_do_we_know_about_marco_polos_journeys/ | {
"a_id": [
"cgbpl7v"
],
"score": [
5
],
"text": [
"It is clear that polo was indeed in China, and was received at the Mongol court. We know this from Chinese records. But it is also clear that he was not considered terribly important. \nPart of the confusion on the Chinese side concerns a Persia... | [] | [] | [
[]
] | |
3wy0jz | why does hollywood seem to use the same soundboard sounds for things like cats and babies? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/3wy0jz/eli5_why_does_hollywood_seem_to_use_the_same/ | {
"a_id": [
"cxzrw31"
],
"score": [
3
],
"text": [
"Because they often do.\n\nThey're called \"stock sound effects\". There are certain noises out there that are free for use (at least within a production company) and were recorded previously. Obviously, if you don't have to pay or get legal autho... | [] | [] | [
[]
] | ||
gmwv4 | What does "sunlight" do that incandescent light can't do? | Both of them emit light at roughly blackbody distributions, and their light distributions both seem centered in a way such that they both produce white light.
Light therapy produces a lot of excess light at the higher frequencies. But then it doesn't even remotely resemble sunlight at all.
| askscience | http://www.reddit.com/r/askscience/comments/gmwv4/what_does_sunlight_do_that_incandescent_light/ | {
"a_id": [
"c1oqraw",
"c1oqsfu",
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"score": [
13,
7,
2
],
"text": [
"You're right that they both emit at roughly blackbody distributions, but according to [Wikipedia](_URL_0_), the Sun's blackbody temperature is ~6500 K, while incandescent light bulbs have a blackbody t... | [] | [] | [
[
"http://en.wikipedia.org/wiki/Color_temperature"
],
[
"http://i.imgur.com/uZoZf.jpg"
],
[
"http://www.soultek.com/blog/uploaded_images/solar_spectrum_captured_by_new_solar_technology-735670.jpg"
]
] | |
2yid10 | What was the first European army to use lines of musket infantry and fire by volleys in battle? | Was it the French with their Musketeers? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/2yid10/what_was_the_first_european_army_to_use_lines_of/ | {
"a_id": [
"cp9wle0"
],
"score": [
3
],
"text": [
"The second question part of the question is easier to answer than the first. \n\nFiring by volleys was an innovation popularized by Maurice of Nassau and the Dutch army and first used at the battle of Nieuwpoort in 1600. Technically, his troops... | [] | [] | [
[]
] | |
2wt6or | Sir Mackenzie Bowell, 5th Prime Minister of Canada? | I've been reading about Sir Mackenzie Bowell, one of the less notable PMs that served in Sir John A's wake. It makes note of the fact that he, along with another PM, were members of the Senate as Prime Minister.
My question is: Who would lead in the House of Commons in this case? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/2wt6or/sir_mackenzie_bowell_5th_prime_minister_of_canada/ | {
"a_id": [
"cotxfli"
],
"score": [
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],
"text": [
"As I've established before here, electoral history is a great love of mine, so please excuse the flair!\n\nWithin the Westminster parliamentary system, it is not necessary for the leader of the government to also be the majority leader of the low... | [] | [] | [
[
"http://www.parl.gc.ca/marleaumontpetit/DocumentViewer.aspx?Sec=Ch25&Seq=10&Language=E#_ftn4"
]
] | |
yiil1 | checksums | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/yiil1/eli5_checksums/ | {
"a_id": [
"c5vvsey",
"c5vvswg",
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"score": [
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28,
2
],
"text": [
"A checksum is a way to check that some number has been typed correctly, or at least is likely to have been done so. For example, the last digit in credit card numbers is a check digit. It is calculated... | [] | [] | [
[],
[],
[]
] | ||
2fj898 | Watering with carbonated water? | So let me know if I'm talking madness, but here's the question: If you were to water a garden/lawn/flowers with carbonated water during the daylight photosynthesis phase, would this be better than watering with just plain water? If so, does the mechanism have to do with delivering more CO2 to the soil, which the plants... | askscience | http://www.reddit.com/r/askscience/comments/2fj898/watering_with_carbonated_water/ | {
"a_id": [
"ck9tf0r"
],
"score": [
22
],
"text": [
"This is probably not a good idea. Carbonated water is more acidic than regular water because it contains carbonic acid and this will decrease the pH level of the soil. Changing the pH like this could be harmful or deadly for the plant."
]
} | [] | [] | [
[]
] | |
entp0o | does eating food affect the absorption of painkillers? | If you were to take painkillers such as paracetamol or ibuprofen on an empty stomach would they work stronger/quicker as there isn’t any food to get in the way? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/entp0o/eli5_does_eating_food_affect_the_absorption_of/ | {
"a_id": [
"fe516z8",
"fe66u82"
],
"score": [
2,
4
],
"text": [
"I don't think so. That kind of recommendation sounds more like to avoid of doing something bad to your stomach. Something like when people recommend to eat something with the coffee to counter the acidity.",
"Pharmacist ... | [] | [] | [
[],
[]
] | |
32c4yn | Why don't planets have 3D orbits? | What I mean is that all the planets seem to orbit along roughly the same plane (lets call it plane x), why aren't their orbits along plane Y or even plane z?
I understand that there are asteroids and comets that do so, but why nothing as massive as a planet? | askscience | http://www.reddit.com/r/askscience/comments/32c4yn/why_dont_planets_have_3d_orbits/ | {
"a_id": [
"cq9ywr6"
],
"score": [
24
],
"text": [
"The solar system originally formed from a huge spherical cloud of gas and dust. Within this cloud, each molecule was attracted to every other molecule by gravity. The cloud was rotating (like everything else in the universe), so it started with ... | [] | [] | [
[]
] | |
2s9st5 | Why was The Blitz ineffective at demoralizing the British population? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/2s9st5/why_was_the_blitz_ineffective_at_demoralizing_the/ | {
"a_id": [
"cnnkyxe",
"cnntc8y"
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"score": [
18,
5
],
"text": [
"It's rather hard to state definitively; as Richard Overy puts it in *The Bombing War: Europe 1939-1945*, \"for the historian... any attempt to suggest what might have led to social breakdown even in one city is an exercise ... | [] | [] | [
[
"http://en.wikisource.org/wiki/A_Fear_For_The_Future"
],
[]
] | ||
4vwnyq | why do people like to make people angry? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4vwnyq/eli5_why_do_people_like_to_make_people_angry/ | {
"a_id": [
"d627bam"
],
"score": [
4
],
"text": [
"In my experience making someone angry is someone's way of feeling powerful by affecting someone. Probably because whoever enjoys causing people to be angry feels out of control in their own life. Also provoking someone to be angry is an easy way ... | [] | [] | [
[]
] | ||
pzh75 | Why does Pluto orbit the sun on a different plane to the planets? | I know the solar system was formed from a disc of gas and dust and that's why the planets are on the same plane, but Pluto has a larger orbital inclination. Are there any other bodies that orbit like this? | askscience | http://www.reddit.com/r/askscience/comments/pzh75/why_does_pluto_orbit_the_sun_on_a_different_plane/ | {
"a_id": [
"c3tgt00"
],
"score": [
3
],
"text": [
"Yes, it's not uncommon. The more massive a body is, the harder it is to lift it out of the plane.\n\nIn the particular case of Pluto, during the Solar System's early years, interactions with Neptune produced the inclination (I'm not sure how det... | [] | [] | [
[]
] | |
247jd5 | demyelinating neuropathy | Trying to prepare for my next appt with Neurologist, but I just can't make my brain work well enough to grok this: _URL_0_
Help much appreciated! | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/247jd5/eli5demyelinating_neuropathy/ | {
"a_id": [
"ch4d9mk",
"ch4dbcl",
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"score": [
3,
2,
2
],
"text": [
"The way the brain works is a series of electrical impulses caused by an action potential. This doesn't work like the matrix says it does. This potential is actually caused by positive charges, potassium... | [] | [
"http://neuromuscular.wustl.edu/nother/myelin.html"
] | [
[],
[],
[]
] | |
2imuzv | why are ebola patients being treated in a wide range of places instead of all being contained in one treatment area, or ones with close proximity? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2imuzv/eli5_why_are_ebola_patients_being_treated_in_a/ | {
"a_id": [
"cl3jkyw"
],
"score": [
4
],
"text": [
"Transport can be dangerous and increase the spread of infection. If you can get the treatment to the patient, better to keep him isolated to reduce the chance of spreading the disease. Also, if you centralized all the patients, one crazy nut coul... | [] | [] | [
[]
] | ||
3p1rd0 | If Photons don't have a mass/charge, why don't they go through matter? | Posting this on mobile sorry for any formatting errors.
Edit: Mainly walls, or other solid objects. | askscience | https://www.reddit.com/r/askscience/comments/3p1rd0/if_photons_dont_have_a_masscharge_why_dont_they/ | {
"a_id": [
"cw2hazy",
"cw2pl4f",
"cw2sc65"
],
"score": [
5,
2,
4
],
"text": [
"I remember in a Sixty Symbols video in which professor Moriarty explained that photons are absorbed by matter. In the very small spectrum of light that we can observe, ROYGBIV, the rays are absorbed int... | [] | [] | [
[
"https://www.youtube.com/watch?v=Omr0JNyDBI0"
],
[],
[
"https://en.wikipedia.org/wiki/Absorption_spectroscopy",
"https://en.wikipedia.org/wiki/Force_carrier"
]
] | |
8tum1b | why is seemingly every photo tagged with a “getty images” watermark? how big are they? and are they just an image host or do they also employ photographers? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/8tum1b/eli5_why_is_seemingly_every_photo_tagged_with_a/ | {
"a_id": [
"e1acu2e"
],
"score": [
2
],
"text": [
"Getty is huge. They buy images from existing photographers and then aggressively protect copyright. I don't believe they employ their own photographers, but prefer to buy images from others."
]
} | [] | [] | [
[]
] | ||
35si0z | The Enola Gay was able to fly into Japan without resistance due to similar flights done by the US that were believed to be recon, but did these previous flights get attacked and did these men die without fighter support so that the Enola Gay could complete its mission? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/35si0z/the_enola_gay_was_able_to_fly_into_japan_without/ | {
"a_id": [
"cr7h1gd",
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6
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"text": [
"By the summer of 1945 there simply put was NO Japanese air force left in any effective manner. Squadrons had been withdrawn to caves and hidden hideouts to serve as suicide attacks when the invasion came. And AAA batteries ... | [] | [] | [
[],
[
"http://ww2db.com/battle_spec.php?battle_id=49"
]
] | ||
4xqvcf | Why did Captain James Cook doubt Australia's existence prior to his first great voyage? | On his first voyage (1768-1771), he had two jobs: 1) Take astronomers to Tahiti to observe the transit of Venus. 2) Try to find the "fabled" Terra Australis and map it.
Why did he, among many others in the Admiralty and Royal Society doubt the existence of the Continent when it was well documented that Abel Tasman ha... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/4xqvcf/why_did_captain_james_cook_doubt_australias/ | {
"a_id": [
"d6ijaf8"
],
"score": [
2
],
"text": [
"It must be understood what Cook was doubting. \n\nThe concept of a Terra Australis was one largely based on an idea that the earth had to be balanced and that the land in the Southern Hemisphere had to roughly equal land in the northern hemispher... | [] | [] | [
[]
] | |
2v47hf | how did filmmakers achieved visual effects in the 70s and early 80s? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2v47hf/eli5_how_did_filmmakers_achieved_visual_effects/ | {
"a_id": [
"coeb2b7",
"coeb932"
],
"score": [
4,
2
],
"text": [
"Well [here](_URL_0_) is an example how some of the effects in Empire strikes back came to be",
"Which visual effects in particular. There are many different kinds."
]
} | [] | [] | [
[
"https://www.youtube.com/watch?v=ODZOSH4Gd2c"
],
[]
] | ||
6ui7h2 | Is it possible to refract radio waves at such a series of angles, that you end up with visible light? | How hard would it be to do, if possible? | askscience | https://www.reddit.com/r/askscience/comments/6ui7h2/is_it_possible_to_refract_radio_waves_at_such_a/ | {
"a_id": [
"dlt0fej",
"dlt0ox2"
],
"score": [
2,
3
],
"text": [
"It is not possible to refract light into a different colour. What you are confusing is the idea of the wavelength changing in the block.\n\nWhen light enters a block and is refracted the wavelength changes because the maximu... | [] | [] | [
[],
[]
] | |
46bck6 | Did British/English society change in any significant way due to the American Revolution? How did it change the way Britain dealt with the rest of her colonies? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/46bck6/did_britishenglish_society_change_in_any/ | {
"a_id": [
"d03vbnh"
],
"score": [
3
],
"text": [
"Regarding the American revolution changing the way Britain dealt with the rest of her colonies, it does seem to have had an effect. Charles Cornwallis, the general who surrendered to US and French forces at Yorktown in 1781, ending the war, was a... | [] | [] | [
[]
] | ||
16yvx8 | Why was the 'hand tucked in the shirt' pose (think Napoleon) so popular in early photographs? | This pic is a good example of what I'm talking about -
_URL_0_ | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/16yvx8/why_was_the_hand_tucked_in_the_shirt_pose_think/ | {
"a_id": [
"c80o2td",
"c80o8q8",
"c81103k"
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"score": [
24,
71,
40
],
"text": [
" In the early days of photography, exposure time was much longer than what you might be used to today. Think 30 minutes for a sunny day outside. The reason is the sensitivity of the early \"films\". ... | [] | [
"http://www.reddit.com/tb/16xs1d"
] | [
[],
[],
[
"http://en.wikipedia.org/wiki/The_Emperor_Napoleon_in_His_Study_at_the_Tuileries",
"http://www.jstor.org/discover/10.2307/3046079?uid=3739256&uid=2129&uid=2&uid=70&uid=4&sid=21101688306837"
]
] | |
3my7za | what tests are scientist's willing to invest in now that there's water on mars, whereas before they wouldn't? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/3my7za/eli5_what_tests_are_scientists_willing_to_invest/ | {
"a_id": [
"cvj5zkh"
],
"score": [
5
],
"text": [
"Well I imagine now they would be more interested in searching for signs of life, as they now know that is a distinct possibility with liquid water. "
]
} | [] | [] | [
[]
] | ||
9qluax | could armored dinosaurs like ankylosaurus and nodosaurus swim? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/9qluax/eli5_could_armored_dinosaurs_like_ankylosaurus/ | {
"a_id": [
"e8a6w50",
"e8a76ic"
],
"score": [
2,
3
],
"text": [
"Theoretically it is possible for large animals to swim. If these dinosaurs did is an entirely different question and one I doubt we have an answer for",
"Very unlikely, because the Ankylosaurus was a walking tank. It wei... | [] | [] | [
[],
[]
] | ||
17wze1 | the phenomenon in our universe known as dark flow | Can anyone dumb [this](_URL_0_) down a little for me? It sounds really interesting but I don't totally understand what is going on. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/17wze1/eli5_the_phenomenon_in_our_universe_known_as_dark/ | {
"a_id": [
"c89kr9z"
],
"score": [
3
],
"text": [
"The first and most important thing to know about it is that it's not actually known to be a thing at all.\n\nFor starters, ignore everything in the universe smaller than a galaxy. In fact, you can *pretty much* ignore everything smaller than a ga... | [] | [
"http://en.wikipedia.org/wiki/Dark_flow"
] | [
[]
] | |
3ar8sj | why are there 'war crimes' which are different to 'crimes' isn't killing someone simply murder? | See title | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/3ar8sj/eli5_why_are_there_war_crimes_which_are_different/ | {
"a_id": [
"csf7e63",
"csf7eiy",
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"csf7ku2",
"csfcrdc",
"csfdtug"
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"score": [
2,
5,
3,
2,
2,
2
],
"text": [
"War crimes are war related crimes outlined in the Geneva convention, like killing prisoners of war, using chemical weapons like poison g... | [] | [] | [
[],
[],
[],
[],
[],
[]
] | |
9p1s9o | Looking for recommendations | [deleted] | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/9p1s9o/looking_for_recommendations/ | {
"a_id": [
"e7yd16w"
],
"score": [
3
],
"text": [
"Understand that overview histories are inherently flaws as they seek general portraits that can be easily picked apart, and they carry with them embedded subjective points of view. That said, I find these two entertaining and well crafted: [the s... | [] | [] | [
[
"https://en.wikipedia.org/wiki/A_History_of_Britain_(TV_series)",
"https://en.wikipedia.org/wiki/The_Great_British_Story:_A_People%27s_History_(TV_series)"
]
] | |
4cvgzl | Whenever I buy a lottery ticket I remind myself that 01-02-03-04-05-06 is just as likely to win as any other combination. But I can't bring myself to pick such a set of numbers as my mind just won't accept the fact that results will ever be so ordered. What is the science behind this misconception? | askscience | https://www.reddit.com/r/askscience/comments/4cvgzl/whenever_i_buy_a_lottery_ticket_i_remind_myself/ | {
"a_id": [
"d1luhax",
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"d1m6glh",
"d1m76ba",
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"d1m7p4x",
"d1m7tsa",
"d1m7yzb",
"d1m87rr",
"d1m8qbf",
"d1m8zrq",
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"d1maekb",
"d1mao9h",
"d1mcy7l",
"d1mdaqr",
"d1mecnd",
"d1mehe6",
"d... | [] | [] | [
[],
[],
[
"https://en.wikipedia.org/wiki/Representativeness_heuristic"
],
[],
[],
[],
[],
[],
[],
[],
[],
[],
[],
[],
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[],
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[],
[],
[],
[],
[],
[],
[],
[],
[
"http://www.dailymail.co.uk/news/article-2301360/The-Lotto-numbers-a... | ||
19euee | Does there exist/could there exist life that uses radiation as a food source? | If there was life that developed in an area with large amounts of radiation, could it evolve to use the radiation as a source of energy? It seems like any gamma rays could be used in some sort of high energy photosynthesis, but what about alpha and beta radiation? | askscience | http://www.reddit.com/r/askscience/comments/19euee/does_there_existcould_there_exist_life_that_uses/ | {
"a_id": [
"c8nfaj7",
"c8nfpgp",
"c8nlfih",
"c8ox8qq"
],
"score": [
5,
3,
2,
2
],
"text": [
"Already happened.\n\n_URL_0_",
"I assume you mean radiation with higher energy than visible light (like the various forms of ionizing radiation)?",
"Just want to chime in h... | [] | [] | [
[
"http://en.wikipedia.org/wiki/Radiotrophic_fungus"
],
[],
[
"https://en.wikipedia.org/wiki/Photolysis",
"https://en.wikipedia.org/wiki/Calvin_cycle"
],
[]
] | |
fah8l | What would happen to someone if they grew up in a low gravity environment such as a moon colony? | I know there would be lower bone density and muscle atrophy etc, but would they ever be able to visit Earth? Or would they just develop abnormally and pretty much be screwed? | askscience | http://www.reddit.com/r/askscience/comments/fah8l/what_would_happen_to_someone_if_they_grew_up_in_a/ | {
"a_id": [
"c1ei73h",
"c1eikyw",
"c1eiuw9",
"c1ej0ku"
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"score": [
17,
5,
7,
2
],
"text": [
"In addition to the low bone density and weak muscles, I'd imagine they'd be really sick from constant radiation exposure. But I don't see any impediment to them coming to earth, a... | [] | [] | [
[],
[],
[],
[]
] | |
jx9ts | wound healing. what is it in our body that makes it heal cuts, burns, scrapes, etc. | And also why are there limitations (some wounds don't heal completely, no limb regeneration like lizards, etc)? And do all people heal at the same rate? And if not, what makes some people heal faster? And is Wolverine a real person? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/jx9ts/eli5_wound_healing_what_is_it_in_our_body_that/ | {
"a_id": [
"c2fv3hf",
"c2fv3hf"
],
"score": [
6,
6
],
"text": [
"In your blood are little things called platelets (or thrombocytes if you want to get specific). When you get cut, your brain tells them to fix the hole, as otherwise you could get infected etc. The platelets stick together a... | [] | [] | [
[],
[]
] | |
3i45zn | why are so many candidates with little chance of winning seeking presidential nomination? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/3i45zn/eli5_why_are_so_many_candidates_with_little/ | {
"a_id": [
"cud4n5m",
"cud4ncn"
],
"score": [
2,
9
],
"text": [
"It gets them additional public exposure, and even if they don't win, the exposure can help them politically since a higher profile means more influence.",
"There might be several motivations: \n\n* The first one is the '... | [] | [] | [
[],
[]
] | ||
1k3jhm | can you actually go blind from looking at a solar eclipse with out proper eye protection? why? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1k3jhm/eli5_can_you_actually_go_blind_from_looking_at_a/ | {
"a_id": [
"cbkzwgu",
"cblanry"
],
"score": [
30,
2
],
"text": [
"Your pupils get large because the light levels are low, but it's still giving you a lot of UV light. Your pupils would normally get smaller to protect you from such a thing, but the eclipse fools this mechanism.\n\nYou abs... | [] | [] | [
[],
[]
] | ||
1cz686 | Has a mythical creature ever turned out to be real? | For example, was the elephant considered a "mythical" creature (such as bigfoot, unicorns etc) by the people in the roman empire? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1cz686/has_a_mythical_creature_ever_turned_out_to_be_real/ | {
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"c9ljyte",
"c9llqla",
"c9llum4",
"c9lm97n",
"c9lnas6",
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"c9lodup",
"c9lojc8",
"c9ls1h5"
],
"score": [
53,
96,
104,
216,
36,
10,... | [] | [] | [
[
"http://io9.com/5814976/cryptids-that-turned-out-be-absolutely-real",
"http://www.newanimal.org/okapi.htm",
"http://thesocietypages.org/socimages/2012/12/31/the-politics-of-discovery-the-case-of-the-lesula/"
],
[
"http://www.nytimes.com/books/first/e/ellis-squid.html"
],
[
"http://en.w... | |
sewal | Light is oscillating electric and magnetic fields. Does this mean that *any* moving charge can create light? | I understand that light is the propagation of changes in electric and magnetic fields (and that these fields are perpendicular to each other). Light is usually created, as I understand, from an accelerating charge. Are there other ways of creating light that do not involve accelerating charges? And do all moving charge... | askscience | http://www.reddit.com/r/askscience/comments/sewal/light_is_oscillating_electric_and_magnetic_fields/ | {
"a_id": [
"c4dgqo1"
],
"score": [
3
],
"text": [
"[Yes!](_URL_0_). A strong or fast moving charge is required.\n\nEdit: As long as it's not moving at a constant speed. And, I just that's not the paper I wanted to link to."
]
} | [] | [] | [
[
"http://webcache.googleusercontent.com/search?q=cache:JtwK5BBzRF4J:www.adams-institute.ac.uk/resources/graduate_lectures/riccardo_bartolini/Lecture1_EM.ppt+&cd=4&hl=en&ct=clnk&gl=us&client=firefox-beta"
]
] | |
13p5q1 | What did the ancient Greeks look like? | In most of what I have read, the better looking elite, would be mostly appreciated by facial symmetry. But would they be bearded? Goatee? Clean Shaven? In most of the art work it seems they have beards, as do the Persians. | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/13p5q1/what_did_the_ancient_greeks_look_like/ | {
"a_id": [
"c76jdj4"
],
"score": [
2
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"text": [
"We must remember first and foremost that Ancient Greece was not a collective entity and the way that the Athenians presented themselves was certainly not the same as how a Persian or a Macedonian would present themselves."
]
} | [] | [] | [
[]
] | |
wsezh | How can patients have half of their brain removed (Hemispherectomy) and still have their memory and personality unaffected? | Does it matter which half is removed? If not, are there copies of the memory and personality in each hemisphere? | askscience | http://www.reddit.com/r/askscience/comments/wsezh/how_can_patients_have_half_of_their_brain_removed/ | {
"a_id": [
"c5g8nql"
],
"score": [
3
],
"text": [
"Hemispherectomy is usually only performed when there is such vast damage to one side of the brain that it is essentially not useful. So, yes, it matters which half is removed. If you simply removed one half of the brain in a normal person, ther... | [] | [] | [
[]
] | |
3gyezh | why does the united nations need permanent members? | Why is the UN not democratic? Why are there permanent members? What makes them more "special"? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/3gyezh/eli5why_does_the_united_nations_need_permanent/ | {
"a_id": [
"cu2luij",
"cu2lxg6"
],
"score": [
6,
6
],
"text": [
"The permanent members of the security council were the most power countries at the time of the formation of the UN. They would not join the UN without the powers of veto and permanent status being given them. Without them th... | [] | [] | [
[],
[]
] |
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