q_id stringlengths 5 6 | title stringlengths 3 301 | selftext stringlengths 0 39.2k | document stringclasses 1
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3mbspq | How does refraction work if the speed of light is a constant? | I've always learned that refraction of a beam of light occurs as it travels from one medium to another because the speed of light in the medium varies. To quote Feynman:
> "The path that light seems to travel is always the path with the least time taken. To paraphrase it, imagine that you're lifeguard and there's a... | askscience | https://www.reddit.com/r/askscience/comments/3mbspq/how_does_refraction_work_if_the_speed_of_light_is/ | {
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"The speed of light is constant in a vacuum.",
"The speed of light is constant in a vacuum. Its speed is slowed by media. The speed of light in air is slightly slower. The spe... | [] | [] | [
[],
[
"https://en.wikipedia.org/wiki/Refractive_index#/media/File:Prism_rainbow_schema.png",
"https://en.wikipedia.org/wiki/Refractive_index"
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[
"https://en.wikipedia.org/wiki/Refractive_index"
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20tfw1 | How often did runaway slaves flee to native country?are there any notable stories or narratives from early America? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/20tfw1/how_often_did_runaway_slaves_flee_to_native/ | {
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"text": [
"Lookup 'William Still, The Underground Railroad'\n\nHe was an abolitionist and a conductor of the Underground Railroad. He interviewed hundreds of runaway slaves, kept records and wrote biographies on them.\n\nedit: also, I ... | [] | [] | [
[],
[
"http://books.google.com/books?id=HT69BbA3Is8C&dq=indian+slave+trade+in+colonial+america&source=gbs_navlinks_s"
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55aeh7 | what does crossing the co2 levels crossing 440ppm mean for the rest of us? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/55aeh7/eli5_what_does_crossing_the_co2_levels_crossing/ | {
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[],
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"https://www.youtube.com/watch?v=buqtdpuZxvk"
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... | ||
2lwcot | why can't all connections to websites be secure https connections? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2lwcot/eli5_why_cant_all_connections_to_websites_be/ | {
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"Because for most web server connections, there's just no need. As a web server administrator, I won't enable https on pages unless there's authentication information or personally identifiable information involved.\n\nHTTPS has additional overhea... | [] | [] | [
[]
] | ||
3d7sd5 | After New Horizons passes by Pluto... are there any other objectives? Or will it just be taking pics of anything that passes by as it leaves our solar system? | What does it do next? Just fly off? | askscience | http://www.reddit.com/r/askscience/comments/3d7sd5/after_new_horizons_passes_by_pluto_are_there_any/ | {
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"From my post in [this recent thread](_URL_2_):\n\n > First, New Horizons will be sending data back for a long period after the fly-by. It will take 16 months (!) for all the data to get sent back. You can read more [here](_URL_1_) and [here](_... | [] | [] | [
[
"http://science.nasa.gov/science-news/science-at-nasa/2014/16oct_kbos/",
"http://pluto.jhuapl.edu/Mission/Spacecraft/Data-Collection.php",
"https://www.reddit.com/r/askscience/comments/3cyps6/what_happens_to_the_new_horizon_after_it_passes/",
"http://www.planetary.org/blogs/emily-lakdawalla/2015/0... | |
20140n | why does my upper lip get dry and red every time i get sick? | I don't think it has to do only with the friction when I blow my nose, does it? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/20140n/eli5_why_does_my_upper_lip_get_dry_and_red_every/ | {
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"It does have quite a lot to do with that actually. The extra mucus creates a wet surface, rubbing it with tissue in such a manner as to wipe off the mucus is okay if that's a relatively rare thing. When it's a very frequent thing, the skin become... | [] | [] | [
[]
] | |
7ufno0 | How do engines of different numbers of cylinders but the same displacement per cylinder (bore X stroke) compare? | It seems that more and more cars have .5L per cylinder and it got me to wondering-
Now, I know that most of the time V8 > V6 > I4 but I'm hoping for a more specific answer than bigger engines = moar power. If you had a naturally aspirated engine that had cylinders with a bore of 89mm and pistons with a stroke of 80 as... | askscience | https://www.reddit.com/r/askscience/comments/7ufno0/how_do_engines_of_different_numbers_of_cylinders/ | {
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"At the basic theory level, yes, each cylinder/piston (formally known as a \"power cell\") would add the same amount of power so a 6-cylinder would have 50% more power than a 4-cylinder with the same displacement/compression ratio per cylinder. In... | [] | [] | [
[]
] | |
16fqvt | Excited state of a hydrogen atom?? | askscience | http://www.reddit.com/r/askscience/comments/16fqvt/excited_state_of_a_hydrogen_atom/ | {
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"You're looking at the wrong transition. The one excited by 656 nm is the n=2 to n=3 transition, not the n=1 to n=2. More detail at _URL_0_.",
"Just a tip: This isn't nuclear physics, this is atomi... | [] | [] | [
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4fyna5 | why aren't there lice and bedbug epidemics everywhere? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4fyna5/eli5_why_arent_there_lice_and_bedbug_epidemics/ | {
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"It's pretty rare for a bedbug to be active during the day. They're sneaky, so they don't like to come out if there's a chance they'll be seen. They also like targets that are motionless, since even ... | [] | [] | [
[],
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3xwy3x | why has the weather been so hot in north america? | It's going to be 68 degrees Fahrenheit on Christmas Eve. Why is it so hot? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/3xwy3x/eli5_why_has_the_weather_been_so_hot_in_north/ | {
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"I take it you're not from Southern California? It is FREEZING here. Sometimes it gets down to 55 degrees Freedom at night!\n\nSeriously though: On average global temps for 2015 appear to be the highes... | [] | [] | [
[],
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"https://en.wikipedia.org/wiki/El_Ni%C3%B1o_Southern_Oscillation",
"https://en.wikipedia.org/wiki/Arctic_oscillation"
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[]
] | |
atfeoy | what is a simple linear regression model? | How can it be applied in the field of Economics? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/atfeoy/eli5_what_is_a_simple_linear_regression_model/ | {
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"So to start out, a linear regression is when you take a series of data points and try to find the line of best fit (a straight line that is as close to every point as it can be). A linear regression can then be used to tell ... | [] | [] | [
[],
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] | |
3jr71k | Has there ever been a monarch who was deposed, but became King/Queen of another country? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/3jr71k/has_there_ever_been_a_monarch_who_was_deposed_but/ | {
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"text": [
"How about Puyi, last Emperor of China? Was Emperor of China, was deposed. Later became Emperor of Manchukuo, a puppet state set up by the Japanese invaders. Manchukuo was a portion of China, not all of China. So a different country. "
]
} | [] | [] | [
[]
] | ||
4bde2s | Russian opinion on Lend-Lease equipment, tanks specifically. | Hey everyone. So I was just wondering what Russian soldiers thought of Western equipment during World War Two, specifically tanks? I've heard that they weren't overly effective but I'm not sure on that. | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/4bde2s/russian_opinion_on_lendlease_equipment_tanks/ | {
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"There is a very interesting book related to this subject, \"Commanding the Red Army's Sherman Tanks: The World War II Memoirs of Hero of the Soviet Union Dmitriy Loza\". Very well written and well worth a read, btw. Loza, started as a lieutenant ... | [] | [] | [
[]
] | |
6imw85 | why handmade products are more valuable than automatically made products? | Given that robots and machines are a hell of a lot more accurate, you'd have a near perfect item/product versus something that was hand made. | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/6imw85/eli5_why_handmade_products_are_more_valuable_than/ | {
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"Define \"valuable\"?\n\nIn terms of, slight reduction in quality for great reduction in price? Economies of scale. I can offer a widget for FAR less if I'm producing millions of them using robots and m... | [] | [] | [
[],
[],
[]
] | |
nhjvm | Is charging electronics on USB 2.0 or micro USB as fast as charging using an outlet? | For example like charging a phone or something. | askscience | http://www.reddit.com/r/askscience/comments/nhjvm/is_charging_electronics_on_usb_20_or_micro_usb_as/ | {
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"You have the tools, why not do an experiment and report back?",
"The posters who are giving a Yes or No answer are forgetting half t... | [] | [] | [
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1rhs2h | gluten | I heard this word for the first time a few years ago and now it's everywhere. Gluten-free this and gluten-free that. I hear people at restaurants asking if a dish is gluten-free. And gluten allergies?! Is this a real thing or made up? If it's real, why did I never hear about it until recently and how can so many people... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1rhs2h/eli5gluten/ | {
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"It's a wheat protein. For most of us it is fine to eat. People with celiac disease are incapable of digesting it properly and thus it causes great gastric discomfort. It's become somewhat of a fad recen... | [] | [] | [
[],
[],
[]
] | |
45holr | I get on a spaceship and travel at nearly the speed of light. When I come back to earth, I've aged less than you. But given that speed is relative, how does the universe "know" which one of us was moving quickly? | askscience | https://www.reddit.com/r/askscience/comments/45holr/i_get_on_a_spaceship_and_travel_at_nearly_the/ | {
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"The difference between the two of us is that you turned around, so you underwent acceleration, and I didn't. That is what distinguishes the two of us.\n",
"There's three re... | [] | [] | [
[],
[],
[],
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"https://en.wikipedia.org/wiki/Mach%27s_principle"
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cyi0rj | How do super storms like Hurricane Dorian affect marine life as the storm travels through the area? Do they affect deep sea creatures? | Edit: Thank you, anonymous do-gooder for the gold! They say it is better to give than to receive, but this is my first gold so I gotta say this feels pretty darn good! | askscience | https://www.reddit.com/r/askscience/comments/cyi0rj/how_do_super_storms_like_hurricane_dorian_affect/ | {
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1bypbw | why do alcoholics stop drinking entirely instead of drinking less? | It's something I've never quite understood. I'm sorry if this seems offensive in any way, I'm just curious. Also not sure if this is true of all alcoholics, but I know it's the approach of AA, which is what you mostly hear about. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1bypbw/eli5_why_do_alcoholics_stop_drinking_entirely/ | {
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"... | [] | [] | [
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2huqhr | How can we see yellow when we don't have yellow color receptors in our eyes? | askscience | http://www.reddit.com/r/askscience/comments/2huqhr/how_can_we_see_yellow_when_we_dont_have_yellow/ | {
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"As you are probably already aware, people have three color cone receptors. The three cones detect different wavelengths of light and those three different wavelengths correspond to red, blue-green, and blue. Now recall your last art class when yo... | [] | [] | [
[
"http://www.animations.physics.unsw.edu.au/jw/light/color-mixing.htm"
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7l28rs | Can Graphene have the photoelectric effect? | If light hits a metal with a frequency higher than that of the threshold frequency of the metal then it will exhibit the photoelectric effect and release a photoelectron with kinetic energy. Knowing that graphene has some similar properties to metals such as being able to conduct electricity, I was wondering wether or ... | askscience | https://www.reddit.com/r/askscience/comments/7l28rs/can_graphene_have_the_photoelectric_effect/ | {
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"The photoelectric effect doesn't just happen in metals, it can happen in any condensed matter, and even gases."
]
} | [] | [] | [
[]
] | |
44v43e | How realistic is the famous meeting between Hannibal and Scipio Africanus talking about the best generals in history? | [deleted] | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/44v43e/how_realistic_is_the_famous_meeting_between/ | {
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"While it may seem odd that Hannibal chose Generals all within recent memory he had good reasons to do so. Alexander the Great is a great choice for greatest general of all time because of the scope of his expansion in such a small (relatively) am... | [] | [] | [
[]
] | |
2zhuv4 | how do large companies such as facebook make back the billions they spend to acquire "unicorn" start-ups and popular applications? | The short reply that people have always given me is "ad revenue" but is this really possible? What advertising companies are spending billions to pop up within applications and how is that beneficial to them? Do that many people click on them and buy whatever it is they're offering? I understand that I am ignorant on t... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2zhuv4/eli5_how_do_large_companies_such_as_facebook_make/ | {
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"User data.\n\nAcquisitions are mostly about getting a customer base, then using them for advertising. Very few are about technology unless it is extremely di... | [] | [] | [
[],
[],
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"https://www.google.ca/finance?q=NASDAQ:FB&fstype=ii"
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r6n5d | why some liquid medicines state a dosage such as 10mg/5ml rather than just 2mg/ml? | Am I just being overly pedantic? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/r6n5d/eli5_why_some_liquid_medicines_state_a_dosage/ | {
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"text": [
"If the typical dosage is 10 mg (or multiples of that) then you have to do a lot less calculation to arrive at the correct amount. And if you have simpler or no calculation there is less risk of getting the dosage wrong.",
... | [] | [] | [
[],
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] | |
2576fh | why does it take such a long time to "trace" phone calls, but it takes me less than 2 seconds to traceroute an ip address? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2576fh/eli5_why_does_it_take_such_a_long_time_to_trace/ | {
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"text": [
"Tracing a call is probably super quick these days. A screenwriter won't care, though, and will milk it for drama."
]
} | [] | [] | [
[]
] | ||
4rzsb2 | why do so many people in cities smoke? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4rzsb2/eli5_why_do_so_many_people_in_cities_smoke/ | {
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"text": [
"Because of the concentration, you see them. People in rural and suburbs smoke/dip, but because people are more spread out, you don't notice it as much.",
"also some confirmation bias, more people go outside to smoke in ... | [] | [] | [
[],
[]
] | ||
72e6vi | why do babies throw everything? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/72e6vi/eli5why_do_babies_throw_everything/ | {
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"If you are talking about infants it's because they have virtually zero motor control. They are learning to process and comprehend outside stimuli. That's why all of their moveme... | [] | [] | [
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84gk2r | How would an Indian person have been treated in Victorian England? | Hello. I apologize if this isn't an appropriate question or doesn't go here. I am working on research for a time-travel story. One of my main characters is Indian, and finds himself in England in 1848. I'm having trouble finding information on how he would be seen and treated and what sort of discrimination he would fa... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/84gk2r/how_would_an_indian_person_have_been_treated_in/ | {
"a_id": [
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"text": [
"Hey there! This is great--it sounds like you are just getting started with the research on this part of your story, so you'll be open to the things you find in your reading. \n\n(We get a lot of people here who already have their plots set up and... | [] | [] | [
[
"https://www.reddit.com/r/AskHistorians/comments/847vgy/how_were_people_of_color_treated_in_the_early/",
"https://en.wikipedia.org/wiki/Catherine_Hall"
]
] | |
1r3q3y | Why was it such a big deal that Henry VIII hadn't produced a male heir even after his daughter Mary was born if England allows women to take the throne? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1r3q3y/why_was_it_such_a_big_deal_that_henry_viii_hadnt/ | {
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2
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"text": [
"The only previous female monarch in England, Matilda, was a bad precedent. Her inheritance was challenged and there was a civil war. Most royal heiresses married a foreign prince and delivered their country and its independ... | [] | [] | [
[],
[]
] | ||
2p2lq0 | why does "premium" 'cat food often contain fruit and veggies is cats are obligate carnivores? | It seems that having things like apples and peas in there is just an another type of "filler," like corn. I would think that cats would be unable to properly process such foods.
edit: should be "if," not "is", in the title. This is what happens when I get up before I wake up. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2p2lq0/eli5_why_does_premium_cat_food_often_contain/ | {
"a_id": [
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"text": [
"Wild cats' prey are herbivores.\n\nCats often eat their smaller prey animals whole; so, when a cat eats a mouse, it in turn eats what the mouse has eaten - a small amount of grains, for instance.\n\n > So, for a cat, the consumption of fermented ... | [] | [] | [
[
"http://feline-nutrition.org/answers/answers-the-stomach-contents-of-prey"
]
] | |
wis6a | Was melee fighting really as 1 on 1 as it's portrayed as in movies? | It seems that just about in every movie with sword-fighting there's always a climatic battle between 2 main characters. I'm wondering if there was ever a time in which there was honour or something similar in battle so that allies would just watch the two fight to the death? Or, more likely, would a eager soldier see 2... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/wis6a/was_melee_fighting_really_as_1_on_1_as_its/ | {
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"text": [
"Yes, however depending on what era and what context the fight wouldn't last more than a few minutes (and this only for perhaps duels where time, endurance, terrain, and psychological impact counted.) Leaders were often targ... | [] | [] | [
[],
[]
] | |
2hnb73 | Was the Middle East before 1948 always a conflictual place? Why? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/2hnb73/was_the_middle_east_before_1948_always_a/ | {
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"text": [
"You should probably try to specify a time before 1948, since the Middle East has a long and complicated history that can't really be summarized in a Reddit post.",
"Before I answer (I have a pretty... | [] | [] | [
[],
[],
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] | ||
6bw1yl | how come hotel key cards get erased by being near cell phones, but credit cards don't? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/6bw1yl/eli5how_come_hotel_key_cards_get_erased_by_being/ | {
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"I actually asked something similar a while b... | [] | [] | [
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1ywizy | Did the French Government ever apologize for the Holocaust? | I watched a documentary on Black Brazilians which said "the Brazilian Government is the only Government to publicly apologize for slavery in their country." After watching a french movie called The Roundup have a lot of questions.
~Has the French Government ever formally apologized to the victims and their families o... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1ywizy/did_the_french_government_ever_apologize_for_the/ | {
"a_id": [
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"score": [
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"text": [
"Concerning your fourth point:\n\nThe crimes of Nazi Germany, everything that led to it and WW2 as a whole are taught VERY prominently in Germany. I might be overestimating it a bit in hindsight, but History lessons felt like 1/4 Nazistuff, 3/4 fo... | [] | [] | [
[]
] | |
3kslgs | why is the quality of editing on internet news reports so poor? | It seems like I have to re-read each news article I see online and decipher the meaning or correct in my head the poor spelling. I can forgive English-US English translations, but a news report should be spell checked and read before being published. I've noticed that these sorts of problems are creeping into the boo... | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/3kslgs/eli5why_is_the_quality_of_editing_on_internet/ | {
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"text": [
"It's hard to know without an example, but I can tell you that a lot of times, the web sites for local TV news stations will have horrible spelling mistakes, because they're just putting the copy for the newscasters on the we... | [] | [] | [
[],
[]
] | |
31l28y | surely someone must know: how do blind people use those bird chirping noises to cross the street? how do they know it's not for the kitty-corner side of the street? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/31l28y/eli5_surely_someone_must_know_how_do_blind_people/ | {
"a_id": [
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"text": [
"Bob is walking north when he approaches an intersection that he knows has an auditory signal. He wants to continue north. He presses the button and listens for the next auditory signal. There is one particular sound that's used for north-south... | [] | [] | [
[]
] | ||
7b3wte | if i had $1billion, what "bank" would/could i deposit it all in. | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/7b3wte/eli5_if_i_had_1billion_what_bank_wouldcould_i/ | {
"a_id": [
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"text": [
"It would be stupid to put it all in one bank because, for one, banks can fail, and two, it could be put to much better use. Ideally one would invest most of it in various forms of assets like stocks and bonds, real estate, etc. "
]
} | [] | [] | [
[]
] | ||
320ys2 | I hope someone can point me in the right direction. I'm looking for information on life in the American west, circa 1870-1875. | I've found a lot of good stuff describing life and travel in the west, but haven't had much luck locating things like exact prices of goods and services, wages, or maps. I would love to find some maps of locales like Dodge City, if such a thing exists, but my google fu has so far failed me, and my local library doesn't... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/320ys2/i_hope_someone_can_point_me_in_the_right/ | {
"a_id": [
"cq6y3us",
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"text": [
"If you're looking for maps, one of your best bets is Sanborn Fire Insurance maps. It looks like maps existed for [Dodge City](_URL_0_) shortly after the period you're interested in. Sanborn Maps are not free, but your local ... | [] | [] | [
[
"http://www.loc.gov/rr/geogmap/sanborn/city.php?CITY=Dodge%20City&stateID=18"
],
[
"https://archive.org/details/catalogueno13spr00mont"
]
] | |
3befoe | Where did the concept of 'a captain must go down with his ship' come from and why? It seems idiotic to waste a captain like that. | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/3befoe/where_did_the_concept_of_a_captain_must_go_down/ | {
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"text": [
"This thread seems to be accumulating multiple below standard posts. Remember, if you can contribute nothing more than your skills at using Google to find an article, please don'... | [] | [] | [
[
"http://www.reddit.com/r/AskHistorians/wiki/rules#wiki_answers"
],
[],
[],
[]
] | ||
g7aao | Why do geothermal plants produce steam? | I know they boil water, but I was looking at some diagrams of several power plants and found that they include a condensation unit. Why is there still steam emitted, despite the presence of this piece of machinery? | askscience | http://www.reddit.com/r/askscience/comments/g7aao/why_do_geothermal_plants_produce_steam/ | {
"a_id": [
"c1lg8lp"
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"score": [
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"text": [
"Are you thinking of a cooling tower? All thermal power generating plants have some waste heat to dissipate (if they didn't they would be violating the laws of Thermodynamics with a 100% efficient process). Usually this excess heat is rejected t... | [] | [] | [
[]
] | |
101irv | can someone explain "old man strength" and "retard strong"? is there any science behind these concepts? | To clarify, old man strength is when you are 60+ but can still lift a lot, chop wood, move furniture, etc. It seems counterintuitive knowing that muscle mass shrinks as you age. Retard strong, while politically incorrect, is about how mentally disabled people seem to be much stronger than what they appear to be. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/101irv/can_someone_explain_old_man_strength_and_retard/ | {
"a_id": [
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"text": [
"As to the idea of \"retard strength\", they are not stronger but because of their mental disability they do not inhibit themselves like we do. For example if i go to pat you on the back my brain knows to limit how hard my hand moves, but someone ... | [] | [] | [
[]
] | |
69ht4c | Are the stories of "No Man's Land Deserters" in World War One true? | I heard some tales about soldiers, both German and British alike, abandoning their trenches to hide out in No Man's Land, coming out only at night to scavenge for food and resorting to cannibalism while releasing blood curdling sounds (likely from Shell Shock).
I know this all kinda sounds romanticized, and I tried lo... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/69ht4c/are_the_stories_of_no_mans_land_deserters_in/ | {
"a_id": [
"dh6ylpb"
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"score": [
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],
"text": [
"A similar question has been asked before. You can view my own answer as well as that of /u/jonewer [here](_URL_0_)"
]
} | [] | [] | [
[
"https://www.reddit.com/r/AskHistorians/comments/4m6sp6/were_there_really_multinational_communities_of/"
]
] | |
6ap8vw | why are sinks that require you to hold the knob thing with one hand to pour water even made? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/6ap8vw/eli5_why_are_sinks_that_require_you_to_hold_the/ | {
"a_id": [
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"text": [
"Water conservation, typically. I believe it's to prevent people from walking away & leaving the faucet on.",
"It's pretty simple. Water preservation. People won't want to stand there for hours to let the water over flo... | [] | [] | [
[],
[]
] | ||
4gadev | if people want to make video games as realistic as possible, why are the distances in video games over exaggerated? | For example on Sunset Overdrive or Assassin's Creed, why is 200m as long as half way across the city? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4gadev/eli5_if_people_want_to_make_video_games_as/ | {
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"Because no one wants to spend two hours just to get to an objective. It's basically just to get rid of tedium. ",
"The problem i... | [] | [] | [
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[],
[],
[],
[],
[
"http://www.newyorker.com/tech/elements/desert-bus-the-very-worst-video-game-ever-created"
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] | |
5t7b51 | What is the smallest amount of matter needed to create a black hole ? Could a poppy seed become a black hole if crushed to small enough space ? | askscience | https://www.reddit.com/r/askscience/comments/5t7b51/what_is_the_smallest_amount_of_matter_needed_to/ | {
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"text": [
"black holes mus... | [] | [] | [
[],
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"https://home.cern/about/physics/extra-dimensions-gravitons-and-tiny-black-holes"
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[],
[],
[],
[],
[],
[
"https://en.wikipedia.org/wiki/Kugelblitz_(astrophysics\\)"
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1pmajg | do any other animals eat for needs besides survival? like pleasure, or health concerns? | I know my fellow humans and I enjoy a good slice of cheesecake for no other reason except it makes me feel preeeeeetty preeeetty pretty good. Do any other animals eat things just for joy? Or even do any animals eat things for health concerns?
Pls hurry so i can go back to being fat. thanks. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1pmajg/do_any_other_animals_eat_for_needs_besides/ | {
"a_id": [
"cd3qo2i"
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"score": [
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"text": [
"My dog definitely eats for pleasure. "
]
} | [] | [] | [
[]
] | |
714b2w | How did the whole 'endangered species' thing come about? | Was it hard for people to accept? What was the catalyst? Who started it? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/714b2w/how_did_the_whole_endangered_species_thing_come/ | {
"a_id": [
"dn8surk"
],
"score": [
2
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"text": [
"[This recent answer](_URL_0_) by /u/hillsonghoods partially touches on your question."
]
} | [] | [] | [
[
"https://www.reddit.com/r/AskHistorians/comments/6ouk3t/how_much_of_a_surprise_was_it_to_contemporary/"
]
] | |
2nffr5 | Why do European monarchs always have the same names with a number afterwards? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/2nffr5/why_do_european_monarchs_always_have_the_same/ | {
"a_id": [
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"text": [
"hi! there's lots of room for more on this, but you can get started on comments in this post\n\n* [Why has no other British King been named Arthur?](_URL_0_)",
"So in Searocksandtrees's post the British monarchs are discu... | [] | [] | [
[
"http://www.reddit.com/r/AskHistorians/comments/1lxcq2/why_has_no_other_british_king_been_named_arthur/"
],
[]
] | ||
5vb3a6 | do people with exotropia (one or both eyes facing outwards) have a wider field of vision? | I know it sounds *ridiculous* but for some reason it has always bugged me. | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/5vb3a6/eli5_do_people_with_exotropia_one_or_both_eyes/ | {
"a_id": [
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"score": [
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"text": [
"They technically see a wider field, but they can't easily interpret what they're seeing because the images don't line up anymore. It'd be like walking around cross-eyed all the time. \n\nIf a baby is born with exotropia, the... | [] | [] | [
[],
[]
] | |
5s5qjl | is it possible to reverse nerve damage caused by neuropathy | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/5s5qjl/eli5is_it_possible_to_reverse_nerve_damage_caused/ | {
"a_id": [
"ddcl9as",
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"score": [
3,
2
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"text": [
"Which kind of neuropathy does this relative have? Neuropathy is a description of a condition (deteriorating nerves), not an ailment in its own right.\n\nAmong peripheral neuropathies, there are some caused by vitamin defici... | [] | [] | [
[],
[
"https://en.wikipedia.org/wiki/Peripheral_neuropathy"
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4hzxao | How is Graham Hancock wrong? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/4hzxao/how_is_graham_hancock_wrong/ | {
"a_id": [
"d2twvfk"
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"score": [
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"text": [
"Graham Hancock does a LOT of cherry-picking of evidence, displays a LOT of confirmation bias, and his research is actually really poor. He constantly sets up straw man arguments to dismiss legitimate academic conclusions. He cites \"experts\" w... | [] | [] | [
[
"https://badarchaeology.wordpress.com/2014/02/05/hancocks-fingerprints-of-the-gods-part-iii-plumed-serpent-central-america-part-one/",
"https://badarchaeology.wordpress.com/2014/01/05/hancocks-fingerprints-of-the-gods-part-ii-foam-of-the-sea-peru-and-bolivia/",
"https://badarchaeology.wordpress.com/20... | ||
27xmk8 | Is there any mention of Jesus traveling in his younger years? | Apparently my girlfriend, a newly minted yoga teacher, encountered a supposition that in the time before biblical mention, Jesus travelled and perhaps learned from wizened teachers outside of his native culture.
I'm only interested in whether there is mention or implication; I don't expect consensus :) | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/27xmk8/is_there_any_mention_of_jesus_traveling_in_his/ | {
"a_id": [
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"text": [
"There's no historical support that I've ever seen, but Osho for one claims Jesus went to Kashmir (his support is mostly the French historian Bernier's observation that Kashmiris looked Jewish afaik)",
"No, there's no men... | [] | [] | [
[],
[]
] | |
2cltw3 | Can you recommend any books on the history of technology and innovation? | I'm thinking more to do with the development and spread of ideas, rather than particular technologies (eg, computers or weapons).
I'm reading Matt Ridley's *The Rational Optimist* and the first few chapters have provided an interesting overview of the history of innovation over the past 100,000 years or so. I want to ... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/2cltw3/can_you_recommend_any_books_on_the_history_of/ | {
"a_id": [
"cjgs299",
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"score": [
2,
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"text": [
"These are a little obvious, but if you haven't read them, you're definitely missing out:\n\n[Connections by James Burke](_URL_0_)\n\n[A Short History of Nearly Everything by Bill Bryson](_URL_1_)\n\nNot really original, but ... | [] | [] | [
[
"http://smile.amazon.com/Connections-James-Burke/dp/0743299558/ref=sr_1_2?ie=UTF8&qid=1407178222&sr=8-2&keywords=connections",
"http://smile.amazon.com/Short-History-Nearly-Everything-ebook/dp/B004CFAWES/ref=sr_1_1?s=books&ie=UTF8&qid=1407178286&sr=1-1&keywords=a+short+history+... | |
d498m3 | how can we see magenta if it doesn’t technically exist on the visible spectrum of light? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/d498m3/eli5_how_can_we_see_magenta_if_it_doesnt/ | {
"a_id": [
"f08t9kg",
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"score": [
8,
6
],
"text": [
"Because it's our name for a color that consists of a *blend* of two existing colors.\n\nHow can we eat a strawberry rhubarb pie, if there is no strawberry rhubarb plant? :-)",
"Our eyes have colour receptors that corresp... | [] | [] | [
[],
[]
] | ||
1hsu3b | How did the Greek hoplites use spears? | i was watching this video and the guy thinks that they were used under arm and has a few good points. I've always been told they used over there head. where they used multiple ways?
_URL_0_ | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1hsu3b/how_did_the_greek_hoplites_use_spears/ | {
"a_id": [
"caxmtg1",
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"text": [
"Honestly, we don't know. Artwork shows both styles, and their art is more symbolic than representative. Each form has its own strengths and weaknesses. It doesn't help that we don't exactly know how phalanxes fought either. ... | [] | [
"http://www.youtube.com/watch?v=klOc9C-aPr4"
] | [
[
"http://upload.wikimedia.org/wikipedia/commons/7/71/Hoplite_fight_MAR_Palermo_NI1850.jpg",
"http://upload.wikimedia.org/wikipedia/commons/thumb/e/ed/Amphora_phalanx_Staatliche_Antikensammlungen_1429.jpg/800px-Amphora_phalanx_Staatliche_Antikensammlungen_1429.jpg",
"http://www.college.columbia.edu/core... | |
bywwah | The ancient history of kink. | Fetish and kink fascinate me endlessly, and while there is a vast ocean of books and knowledge out there about kink from this century, I'm now more interested in the ancient history of kink. I'm talking the 17th century and backwards. If you know of any books about this I'd be so grateful if you gave me the title.
The... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/bywwah/the_ancient_history_of_kink/ | {
"a_id": [
"eqpxfn7"
],
"score": [
16
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"text": [
"You might want to check out /u/AnnalsPornographie's answer and follow-ups to this question from a few months ago: [Is there any documentation of various sexual “kinks” in ancient civilizations?](_URL_0_)"
]
} | [] | [] | [
[
"https://www.reddit.com/r/AskHistorians/comments/a89oqd/is_there_any_documentation_of_various_sexual/"
]
] | |
9aoqsy | how does strict nat and upnp affect online connectivity while gaming? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/9aoqsy/eli5_how_does_strict_nat_and_upnp_affect_online/ | {
"a_id": [
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"NAT or Network Address Translation is basically a way for your router to handle translating private/local IP addresses (192.168.x.x/172.16.x.x/10.x.x.x) to public addresses. Without it, each device on a local network would either need a public IP... | [] | [] | [
[]
] | ||
33uely | why do eyes adapt to dark spaces but not dark glasses or tint? | When we go inside our eye adapts to less light than outside and we see objects equally bright, but when we wear sunglasses or ride in a car with tint our vision is darker than usually. Why is that the case?
P.S. Sorry if it's a dumb question. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/33uely/eli5why_do_eyes_adapt_to_dark_spaces_but_not_dark/ | {
"a_id": [
"cqoihj3"
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"score": [
2
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"text": [
"Not a dumb question at all. Our eyes are sensitive enough to see at night with just starlight up to a completely sunny day. However, it takes time for our eyes to adapt to the lighting conditions and even when adapted, we only can see a limited r... | [] | [] | [
[]
] | |
3qf2i3 | Why can protein structures not be predicted by computers? Why is crystallography necessary? | I thought it could be done as scientists probably know the amino acid sequence, and because the chemical properties of the different amino acids are known. | askscience | https://www.reddit.com/r/askscience/comments/3qf2i3/why_can_protein_structures_not_be_predicted_by/ | {
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"score": [
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3,
7
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"text": [
"The problem is a result of two factors: 1) we only know the chemical properties of functional groups on proteins to a reasonably high level, and 2) this is compounded by the fact that proteins are massi... | [] | [] | [
[],
[],
[]
] | |
4a68gl | can penicillin be made from cheese you buy? if so, how would you make it? | Never know if the end of civilization is coming, might have to make some! | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4a68gl/eli5_can_penicillin_be_made_from_cheese_you_buy/ | {
"a_id": [
"d0xr076"
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"score": [
2
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"text": [
"You don't \"make\" penicillin exactly (well nowadays it's probably synthesized but that wasn't the case of its discovery). It's a common mold, meaning there's all sorts of mold and fungi spores floating around in the air. Yeah if you leave some b... | [] | [] | [
[]
] | |
1lih49 | patent trolls | For some reason this isn't clicking with me, who's the good guy and who's the bad guy in a situation like this? is there even a good and bad guy? The picture that keeps coming to mind is that guy who has that really general patent on console controllers. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1lih49/eli5_patent_trolls/ | {
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"score": [
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"text": [
"From what I understand they're small companies (who usually make little to no products) who... | [] | [] | [
[],
[],
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19zfgx | why do people get flakes in their hair? | Ive tired all types of methods but still everyday I brush my hair and flakey flakey :( any input Is more than welcome | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/19zfgx/why_do_people_get_flakes_in_their_hair/ | {
"a_id": [
"c8sov5a"
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"score": [
2
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"text": [
"Its bits of dead skin from your scalp. I used to have dandruff too it went away after I STOPPED using head and shoulders. "
]
} | [] | [] | [
[]
] | |
3gan57 | Why didn't Ottoman pirates join in with the plundering of gold from the new world? | As far as I read, the Ottoman state was not interested in joining the colonization race, since they already controlled the trade routes to the far east.
But why were individual Ottoman pirates not intercepting gold hauling ships of colonizing nations?
They appear to be ruling the Mediterranean in the 16th century. Th... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/3gan57/why_didnt_ottoman_pirates_join_in_with_the/ | {
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"text": [
"Your assertion that the Ottomans \"controlled the trade routes to the far east\" is an oversimplification of the situation in the 16th century. They controlled part of a route that was a bottleneck for trade between Europe a... | [] | [] | [
[
"https://www.reddit.com/r/AskHistorians/comments/39ug4g/why_did_the_ottoman_empire_not_help_the_muslims/cs74xai",
"https://www.reddit.com/r/AskHistorians/comments/37mpi4/how_did_naval_warfare_look_like_in_the_high_and/croaz5e",
"https://www.reddit.com/r/AskHistorians/comments/3et5p9/why_didnt_ottoman_... | |
230bct | What is the oldest law that is still in force? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/230bct/what_is_the_oldest_law_that_is_still_in_force/ | {
"a_id": [
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"text": [
"My best guess is The Fairs Act of Ireland from 1204 CE. Page 12 of this pdf [warning] of the [Irish Statute Book](_URL_0_), under the Schedule titled \"Statutes Retained\" indicates that it's the oldest law still in effect in Ireland. I assumed m... | [] | [] | [
[
"http://www.irishstatutebook.ie/pdf/2007/en.act.2007.0028.pdf"
]
] | ||
3f7u6v | why do emergency vehicles have to turn off their sirens while passing cemeteries? | I work at a mortuary with a cemetery out back. Some nights I work as the gatekeeper. Ive noticed that, night or day, most emergency vehicles will turn off their sirens while passing by the cemetery.
It could be that they are doing this because of the mortuary, because they are on the same plot of land, however I find... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/3f7u6v/eli5_why_do_emergency_vehicles_have_to_turn_off/ | {
"a_id": [
"ctm9z1e"
],
"score": [
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],
"text": [
"It's because at night, and during the early morning, we try to only use the sirens and horns when we actually need them.\n\nWe are public servants, so it would be quite shitty to wake our citizens up if they don't want to be."
]
} | [] | [] | [
[]
] | |
5vtwu4 | why is freshly popped toast crunchy but toast that has been sitting out for awhile chewy? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/5vtwu4/eli5_why_is_freshly_popped_toast_crunchy_but/ | {
"a_id": [
"de4tt40"
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"score": [
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],
"text": [
"Toast that is freshly made has had most of the water cooked out of it. That makes it crunchy. Toast that has sat around for a while has absorbed water from the air and become more chewy. "
]
} | [] | [] | [
[]
] | ||
1qataz | why do people wear helmets in autocross? | When doing driving exercises, like autocross, why do tracks or clubs require people to wear helmets? Obviously, the helmet would be to protect your head, but with cars being loaded with airbags (steering wheel, side curtain, etc) and also being held in by a 3 point or 5 point seatbelt, what would the helmet provide th... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1qataz/eli5_why_do_people_wear_helmets_in_autocross/ | {
"a_id": [
"cdaxps6",
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"score": [
3,
3,
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],
"text": [
"Have you ever seen a rollover crash? How the top of the car, even with a roll cage, crumples in. If someone weren't wearing a helmet the top could cut your head open. ALSO you can bang your head on the ... | [] | [] | [
[],
[],
[]
] | |
34qm6t | how come the internet archive project (_url_0_) has so much space to store the entire web history? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/34qm6t/eli5_how_come_the_internet_archive_project/ | {
"a_id": [
"cqxa88s",
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3
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"text": [
"For a start, it does not store the entire history of the web. It stores a lot of snapshots of a lot of sites, but nowhere near all sites, nor even everything that is on a site they have stored.",
"Storage space is incre... | [
"archive.org"
] | [] | [
[],
[
"https://xkcd.com/394/"
]
] | ||
5s2tvf | what would change if all 50 us states became independent countries? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/5s2tvf/eli5_what_would_change_if_all_50_us_states_became/ | {
"a_id": [
"ddc0erb"
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"score": [
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"text": [
"I read a great thread years ago (I think 2011-2012) where someone asked what would happen if all 50 states declared war on another. It was very cool. Talked about coalitions that would form naturally. For example, New England states which produce... | [] | [] | [
[]
] | ||
nrimn | How is barometric pressure used to predict a coming storm or a change in weather? | askscience | http://www.reddit.com/r/askscience/comments/nrimn/how_is_barometric_pressure_used_to_predict_a/ | {
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"text": [
"Very, very roughly:\n\n* No change in pressure, similar weather.\n* Drop in pressure - worsening weather.\n* Increase in pressure - improving weather.\n\n[wikipedia](_URL_0_)",
... | [] | [] | [
[
"http://en.wikipedia.org/wiki/Barometer#Applications"
],
[],
[
"http://en.wikipedia.org/wiki/Barometer#Applications"
],
[]
] | ||
1n3i0q | Why did the seafarers from Borneo colonize Madagascar and not places closer to their origins? | I think it's a huge mindfuck that they were able to cross thousands of miles in their outrigger canoes and settled successfully in an island that's geographically VERY remote from where they originally were. Were the first settlers able to maintain ties with their origins for a long time? Why couldn't they settle in pl... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1n3i0q/why_did_the_seafarers_from_borneo_colonize/ | {
"a_id": [
"ccf2yp3"
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"score": [
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"text": [
"They did. The [Polynesian expansion](_URL_0_) moved both east and west. Madagascar and Easter Island represent the farthest extent of their settlement, and were also settled latest. The Polynesians would jump from island to island, and when thos... | [] | [] | [
[
"http://www.transpacificproject.com/wp-content/uploads/2011/06/austronesian-expansion.jpg",
"http://marinebio.org/i/currents/Ocean_currents_1943.jpg"
]
] | |
67a8lt | How is it that the concept of an Electromagnetic Field avoids the problems caused by the concept of a "Luminiferous aether" with regards to relativity? | When people talk about a "field that permeates all of space" I picture something either like a 3 dimensional grid, or like a liquid that fills up the universe. However, it seems that something like that would create a universal frame of reference with regards to the propagation of light, which the theory of relativity... | askscience | https://www.reddit.com/r/askscience/comments/67a8lt/how_is_it_that_the_concept_of_an_electromagnetic/ | {
"a_id": [
"dgoxkiz",
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"score": [
10,
6
],
"text": [
"The first postulate of special relativity can be formulated as such: \n\n > The laws of physics are invariant (i.e. identical) in all inertial systems (non-accelerating frames of reference)\n\nWhich implies that as far as ... | [] | [] | [
[
"https://en.wikipedia.org/wiki/Classical_electromagnetism_and_special_relativity",
"https://physics.stackexchange.com/questions/25928/is-the-cmb-rest-frame-special-where-does-it-come-from",
"http://www.feynmanlectures.caltech.edu/II_26.html"
],
[]
] | |
6v4b6s | what is the significance of maggots in the decay of corpses? | Hello ELI5 community. I haven't seen any posts similar enough to my question, but if you know of any that have already been answered, I'd be grateful for the redirect. So here's my question: can the body naturally decompose without the help of organisms such as maggots? It's well known how bodies can be preserved when ... | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/6v4b6s/eli5_what_is_the_significance_of_maggots_in_the/ | {
"a_id": [
"dlxmgki",
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"score": [
3,
2
],
"text": [
"Decay is caused by microorganism, freezing the body freezes them. So yes, freezing the microorganism is the only reason the decomposition stops.",
"Maggots help speed the process along but bacteria alone can decompose a ... | [] | [] | [
[],
[]
] | |
89yx4p | why/how could one get a heart attack after being angry? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/89yx4p/eli5_whyhow_could_one_get_a_heart_attack_after/ | {
"a_id": [
"dwunnua"
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"text": [
"I've heard that it works like this (but someone please correct me if I've been misinformed): The heart is a muscle and when you get angry one of the body's reactions is to increase heart rate, blood flow, etc. If the heart is asked to do more th... | [] | [] | [
[]
] | ||
pwwpq | Why is the fertile life of human sperm so short? | Since there's a huge amount of selective pressure to impregnate successfully, why do human sperm [die so soon](_URL_0_) after coitus? Other species have sperm that can last [years](_URL_1_), so there must be some evolutionary benefit for human sperm to have such a short shelf life. What is this benefit? | askscience | http://www.reddit.com/r/askscience/comments/pwwpq/why_is_the_fertile_life_of_human_sperm_so_short/ | {
"a_id": [
"c3swxpz",
"c3sx1xd",
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"score": [
2,
3,
2
],
"text": [
"It is more energetically costly to have stronger, more long-lived sperm. That is why women only produce a few eggs that last for the majority of a lifetime, while men produce countless sperm that last f... | [] | [
"http://www2.oakland.edu/biology/lindemann/spermfacts.htm",
"http://en.wikipedia.org/wiki/Ant#Development_and_reproduction"
] | [
[],
[],
[]
] | |
397cht | Why does water evaporate so much quicker than oil? | I keep noticing that water stains on clothes evaporate in a matter of minutes, but oil never seems to evaporate at all. The stain of sauce I made during lunch last week would still be sitting happily on my shorts hadn't they been washed. What is happening here? Why doesn't the oil evaporate like water does? | askscience | http://www.reddit.com/r/askscience/comments/397cht/why_does_water_evaporate_so_much_quicker_than_oil/ | {
"a_id": [
"cs1csca",
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"score": [
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"text": [
"For one thing, although oil is non-polar and only exhibits relatively weak inter-molecular forces (forces that act to bind neighboring molecules together (cohesion/adhesion)), when compared to the hydrogen bonding that water... | [] | [] | [
[],
[]
] | |
6t2mxj | How did Trireme fleets navigate the Aegean? | The way I understand it, the large galley ships of Antiquity usually couldn't carry enough supplies on board to sustain the crew for more than a day or so, and so they tended to stay within sight of the coast.
How would this work logistically for voyages across the Aegean? Say if I'm in Miletus, and someone in Cori... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/6t2mxj/how_did_trireme_fleets_navigate_the_aegean/ | {
"a_id": [
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"score": [
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"text": [
"It's not actually that difficult to keep within sight of land sailing more or less straight across the Aegean. Modern-day Greece has over a thousand islands, as many as five or six thousand by some estimates (depends what an island is). The moder... | [] | [] | [
[]
] | |
fmsaq | What atoms last the longest in the body? | Inspired by this post:
_URL_0_
I have heard on a number of other occasions that all atoms in your body are eventually expelled and replaced. Is there any study on which parts of your body "retain" particular atoms in the longest? I would guess it would be bones and teeth, right? If so, how long are those atoms re... | askscience | http://www.reddit.com/r/askscience/comments/fmsaq/what_atoms_last_the_longest_in_the_body/ | {
"a_id": [
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"score": [
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3
],
"text": [
"Accumulated heavy metal atoms like mercury stay with you forever (I think).",
"Almost everything that occurs naturally in your body except the DNA is renewed. Once a cell is made as long as it dies its DNA is (generally,... | [] | [
"http://www.reddit.com/r/biology/comments/fmr5o/is_every_cell_in_your_body_replaced_every_7_years/"
] | [
[],
[
"http://www.dana.org/news/publications/detail.aspx?id=4234"
]
] | |
3gbnoj | why the black lives matter protesters shut down bernie sanders twice? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/3gbnoj/eli5_why_the_black_lives_matter_protesters_shut/ | {
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"text": [
"I'll probably be downvoted for this, but so be it.\n\nThe BLM movement is not about social justice or any other glorious left-wing ideal. It's a black nati... | [] | [] | [
[],
[],
[],
[],
[
"http://rhrealitycheck.org/ablc/2015/07/22/youre-white-marched-dr-king/"
]
] | ||
9vyl17 | Question about medieval weaponry used post battle | The Medieval period is full of interesting and strange weapons. Im currently doing some research for a project and I'm having trouble finding the name of a very specific weapon.
Basically as I undersand it (during the medieval period) after a battle the winning side, or the side left at the battlefield, would go arou... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/9vyl17/question_about_medieval_weaponry_used_post_battle/ | {
"a_id": [
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"score": [
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"text": [
"You're probably thinking of the *misericorde*, a long, narrow-bladed dagger with similarities to both the earlier rondel dagger and the later stiletto, appearing around the 13th century and carried as a sidearm. Its shape certainly lent itself to... | [] | [] | [
[]
] | |
2jf3ur | Why do I see water vapor when I open the hot water in my shower? | The boiling point for water is at around 100ºC.
I'm not sure what is the maximum temperature I can get in my shower but I don't think it is near 100ºC.
It has something to do with the difference of pressure between the pipe and the atmosphere? | askscience | http://www.reddit.com/r/askscience/comments/2jf3ur/why_do_i_see_water_vapor_when_i_open_the_hot/ | {
"a_id": [
"clb3fm8"
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"score": [
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"text": [
"Water that is truly in the gas phase is not visible to our eyes. What we see when we describe steam or vapor is an accumulation of water molecules condensing back into the liquid phase in the form of very small droplets.\n\nWe usually think of ... | [] | [] | [
[]
] | |
rlzqr | Does skin grow back (or does it just stretch)? | Sorry if this is a stupid/basic question.
My friend heard a lecture from a doctor who said that skin does not grow back, but rather just stretches in wound healing. In the case presented in that lecture, a dog suffered from severe wounds that caused its skin to stretch during the healing process to the point where at ... | askscience | http://www.reddit.com/r/askscience/comments/rlzqr/does_skin_grow_back_or_does_it_just_stretch/ | {
"a_id": [
"c46wagd",
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"score": [
5,
3
],
"text": [
"[Skin grows back](_URL_0_), more or less.\n\n > The proliferative phase lasts from 2 days up to 3 weeks. During this time the wound begins to heal by building tissue, including skin and blood vessels. The proliferative phas... | [] | [] | [
[
"http://www.ehow.com/how-does_5408825_cut-skin-heal_.html",
"http://en.wikipedia.org/wiki/Keloid"
],
[]
] | |
1bjxfx | Who policed pre-Revolutionary Boston? | Who investigated crimes? How was criminal justice handled?
I'm most interested in the years just prior to the start of the war, from about 1770 to 1775.
Thanks. | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1bjxfx/who_policed_prerevolutionary_boston/ | {
"a_id": [
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"text": [
"**The Sheriff**\n\nThe primary policing authority was Sheriff Stephen Greenleaf. He had the power to call on the militia to deal with criminals or mobs, serve writs to search buildings and ships, and to arrest suspects and place them in the gaol ... | [] | [] | [
[
"http://www.gijoecanada.com/images/britains_georgian%20sentry%20box_wb44023.jpg",
"http://lowres-picturecabinet.com.s3-eu-west-1.amazonaws.com/29/main/7/143226.jpg",
"http://lowres-picturecabinet.com.s3-eu-west-1.amazonaws.com/29/main/3/64933.jpg",
"http://boston1775.blogspot.com/2007/03/benjamin-... | |
ezfhj6 | How do the Teutonic Knights differ from the Knights Templar? I know that the Teutonic were Germanic but where did they differ in terms of ideology’s. Both were Christian but what made them different in there crusades, fighting styles, rules? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/ezfhj6/how_do_the_teutonic_knights_differ_from_the/ | {
"a_id": [
"fgn39km"
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"The first Crusade started in 1096 and lasted until 1099, the causes of this are widely debated but I was taught that the Crusades were launched in response to the Seljuk victory at Manzikert which saw a large portion of Anatolia(Modern day Turkey... | [] | [] | [
[]
] | ||
38igpo | Why did the German states, and then Germany manage to industrialize so effectively in the 19th century? | Did they industrialize more per capita than other European countries? If they did what gave them the edge? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/38igpo/why_did_the_german_states_and_then_germany_manage/ | {
"a_id": [
"crvivwb",
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"score": [
18,
2
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"text": [
"This industrial growth is both a byproduct and a necessity of Chancellor Bismarck's plans for Germany's socio-political control of the region. The general feeling in Europe since the Franco-Prussian War was that a general E... | [] | [] | [
[],
[
"http://en.wikipedia.org/wiki/Peter_Henlein"
]
] | |
6uz2wx | what is the process of paying taxes for someone who is self-employed? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/6uz2wx/eli5_what_is_the_process_of_paying_taxes_for/ | {
"a_id": [
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"score": [
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3
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"text": [
"They make quarterly tax payments. You would typically fill out the 1040es, then paywhatever that says is due.\n\n_URL_0_\n\nYou are not actually turning in the form, so if you wanted to, you could just guess how much you ne... | [] | [] | [
[
"https://www.irs.gov/pub/irs-pdf/f1040es.pdf"
],
[]
] | ||
7v4ic1 | Why did the USSR fail to capitalize on social unrest in the 60s and 70s? Alternatively, why couldn’t the Beatles play in Moscow? | The antiwar movement, civil rights, and rock and roll all were destabilizing to the United States. Why didn’t the USSR support these movements more, considering if these were painted as communistic that would have galvanized a significant yourh population towards the east? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/7v4ic1/why_did_the_ussr_fail_to_capitalize_on_social/ | {
"a_id": [
"dtph4z9"
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"score": [
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],
"text": [
"While a number of Western , largely conservative, critics of the New Left and the wider 1960s counterculture as communist, this did not mean the New Left was Marxist-Leninist in nature or that the USSR identified with them.The Soviet leadership ... | [] | [] | [
[
"http://static.messynessychic.com/wp-content/uploads/2015/05/antistilyaga.jpg",
"https://lh4.googleusercontent.com/-ZLbRtrPfPKk/ThnbVSs5tDI/AAAAAAAAHhk/dbV9G3Hw0qg/s800/crocodile_1971_12.jpg",
"https://glorialana.files.wordpress.com/2013/08/helper.jpg",
"https://pbs.twimg.com/media/CTiep-NXIAAFbtj... | |
am277k | how the part of the human brain that controls concentration and problem solving works on concert with the part that looks for instance gratification and procrastination. | I had read an article a long time ago about how there is a part of our brain that seeks instance gratification is a type of self-defence mechanism. Now, I may not be remembering it correctly and the article may have been a theory, but I wanted to learn more about where these opposite ideas come from in the brain and w... | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/am277k/eli5_how_the_part_of_the_human_brain_that/ | {
"a_id": [
"efj5n14",
"eflvctr"
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"score": [
4,
2
],
"text": [
"I think you might want to find the article, since the language you're using isn't very precise. There's no part of your brain that controls \"concentration and problem solving,\" and there's no part of your brain that \"look... | [] | [] | [
[],
[]
] | |
3awfd5 | Is the rate at which a feather and a brick fall in a vacuum truly the same? | I hear so often that the rate of acceleration near ground level on Earth is *always* exactly the same no matter how heavy they are. However, using the gravitational equation F=(GmM)/d^2 would lead me to believe that the gravitational force on a brick is ever so slightly greater than a feather, and with F=ma with mass ... | askscience | http://www.reddit.com/r/askscience/comments/3awfd5/is_the_rate_at_which_a_feather_and_a_brick_fall/ | {
"a_id": [
"csgvwg4"
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"score": [
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"text": [
"If you ignore the movement of the larger body, say the Earth or moon, then the relationship is exact as \"m\" cancels out, \n\n > F = ma = GMm/r^2 \n > a = GM/r^2 \n\nSo you're right, it's a half-truth, but the difference is so unimaginably... | [] | [] | [
[
"https://youtu.be/5C5_dOEyAfk"
]
] | |
98pdez | what stops minors from buying lottery tickets from machines | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/98pdez/eli5_what_stops_minors_from_buying_lottery/ | {
"a_id": [
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"text": [
"Nothing stops you from buying them. You just won't be able to redeem them yourself, if you win. ",
"The ticket would honestly be invalidated; most of the lotto machines are on camera feeds, and the ticket sales are times... | [] | [] | [
[],
[]
] | ||
117lof | What were some of the most impactful yet unpredicted developments in history? | I was listening to Dan Carlin's common sense podcast and he was going on about how history can show you that the range of possibilities for the future is much wider than people generally think.
He mentions how before the soviet union fell, no one would have thought it possible that it would fall. Similarly, no one ... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/117lof/what_were_some_of_the_most_impactful_yet/ | {
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10,
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"text": [
"Industrialisation and t... | [] | [] | [
[],
[
"https://upload.wikimedia.org/wikipedia/commons/thumb/e/ea/Mongol_Empire_map.gif/250px-Mongol_Empire_map.gif"
],
[],
[],
[],
[
"http://en.wikipedia.org/wiki/Bojinka_Plot#Phase_II.2C_CIA_plane_crash_plot",
"http://news.findlaw.com/hdocs/docs/911rpt/"
],
[],
[],
[],
[],
[]
] | |
50kmqc | How did the HRE become the mess that it did? | [deleted] | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/50kmqc/how_did_the_hre_become_the_mess_that_it_did/ | {
"a_id": [
"d74u3c4"
],
"score": [
5
],
"text": [
"Can you clarify what you mean by 'the mess that it did'?"
]
} | [] | [] | [
[]
] | |
406fxg | Quantum fluctuations after big bang? | I was just wondering what the actual mechanism of these "quantum fluctuations" that ive read about are. As i am understood they are some how responsible for fluctuations in particle density in the very early universe which caused stars, galaxies etc. to form, and i was just curious what they actually are. Thank you. | askscience | https://www.reddit.com/r/askscience/comments/406fxg/quantum_fluctuations_after_big_bang/ | {
"a_id": [
"cys0p3i",
"cys0s8j"
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"score": [
2,
14
],
"text": [
"This is rooted in the context of inflation. In inflationary models you typically have a period of extremely rapid exponential expansion of the Universe due to a particular scalar field, the inflaton, being in an excited sta... | [] | [] | [
[],
[]
] | |
1c1a38 | What factors led the decline of Londinium and how did this change and allow London to develop? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1c1a38/what_factors_led_the_decline_of_londinium_and_how/ | {
"a_id": [
"c9catms"
],
"score": [
3
],
"text": [
"London is essentially a port city. Even if it isn't literally a port, it is a good \"hub point\" for much of the British island to connect to the Thames, and thus essentially controls much of the trade into and out of Britain (Bristol is probably... | [] | [] | [
[]
] | ||
v5axo | Is it possible to mentally stimulate the release of adrenaline? | Physically unstimulated; imagine the person is sitting in an armchair at home, eyes closed. | askscience | http://www.reddit.com/r/askscience/comments/v5axo/is_it_possible_to_mentally_stimulate_the_release/ | {
"a_id": [
"c51gut0",
"c51h3ly"
],
"score": [
2,
11
],
"text": [
"Depending on what you mean by physically unstimulated, i.e if you have been in a scary/dangerous situation before then by thinking about it or thinking of possible consequences could easily cause a reaction. On the other ha... | [] | [] | [
[],
[]
] | |
f08cco | What is actually happening when an image is out of focus and how do lenses focus them? | I have a strip of film which I was trying to project onto a wall using a torch. I noticed the image was out of focus, but I don't understand why. | askscience | https://www.reddit.com/r/askscience/comments/f08cco/what_is_actually_happening_when_an_image_is_out/ | {
"a_id": [
"fgs545j",
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"score": [
780,
27,
62,
15,
7,
6,
2,
2
],
"text": [
"The basis of a lens is the refraction index (n) (I studied it in Spanish so idk if the ... | [] | [] | [
[],
[],
[
"https://i.pinimg.com/originals/32/bd/c6/32bdc6da66b327b5e000e6db9cb46f93.gif",
"https://www.physicsclassroom.com/Class/refrn/u14l5c1.gif",
"http://electron6.phys.utk.edu/optics421/modules/m2/images/mfocus.gif"
],
[],
[
"http://4.bp.blogspot.com/-DolN7T5j_w0/UZEXCIji2eI/AAAAAAAAA... | |
8u02pz | why is the roman empire considered so important that we teach it to this day? | [deleted] | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/8u02pz/eli5_why_is_the_roman_empire_considered_so/ | {
"a_id": [
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],
"score": [
3,
7,
20,
8,
5,
2,
2
],
"text": [
"It was one of the first actually the first of its kind. It was run politically sound with a few exceptions. It tu... | [] | [] | [
[],
[],
[],
[],
[],
[],
[]
] | |
sx2a5 | why are countires threatening each other with nuclear weapons? if anyone used one wouldn't they just be hurting themselves? | I keep reading about all the counties that have nuclear weapons and it's such a big deal but why would anyone use one in the first place? Isn't it just a stalemate for everyone since using one would just screw everyone over?
I know there's a lot of history here and a lot of politics but I don't really know or fully un... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/sx2a5/eli5_why_are_countires_threatening_each_other/ | {
"a_id": [
"c4hpncr",
"c4hv3wr"
],
"score": [
8,
5
],
"text": [
"Who's threatening to use them? Having nuclear weapons is essentially just a deterrent for other countries using nuclear weapons. Trying to get nuclear weapons is basically just ensuring no ther country uses it on you.",
... | [] | [] | [
[],
[
"http://www.youtube.com/watch?v=efHCdKb5UWc",
"http://en.wikipedia.org/wiki/Mutual_assured_destruction"
]
] | |
34d5tu | Where can I read contemporary accounts of sailors (or pirate)'s lives (from before the 20th century) | I've been reading lots about sailors, whalers and pirates lately and would love to read about their lives in their own words. [This](_URL_0_) article about a sailor's journal peaked my interest but I haven't been able to find anything else online, other then some letters of marque which aren't particularly thrilling re... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/34d5tu/where_can_i_read_contemporary_accounts_of_sailors/ | {
"a_id": [
"cqtk5w8",
"cqtp8i9",
"cqtq4zm"
],
"score": [
2,
2,
2
],
"text": [
"Dampier, William (Ed. John Masefield). Dampier's Voyages (London, 1906).\n\nExquemelin, A.O. Bucaniers of America (London, 1684). [Note: I've read this one. I think there's a 1920's edition available on... | [] | [
"http://www.dailymail.co.uk/news/article-1044940/Diary-18th-century-sailor-provides-fascinating-insight-life-decks-Nelsons-navy.html"
] | [
[
"http://www.loc.gov/exhibits/kislak/kislak-interactive.html"
],
[
"http://www.gutenberg.org/ebooks/4277"
],
[]
] | |
6m9f9s | Why did British Prime Minister Anthony Eden reject French Prime Minister Guy Mollet's idea of an economic and political union between France and Great Britain? | I've been doing some reading surrounding the proposed Franco-British Union, and saw that British Prime Minister Anthony Eden rejected this idea. To quote Wikipedia, where I was doing the reading:
> In September 1956, due to a common foe during the Suez Crisis, an Anglo-French Task Force was created. French Prime Mini... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/6m9f9s/why_did_british_prime_minister_anthony_eden/ | {
"a_id": [
"dk0gvrs"
],
"score": [
5
],
"text": [
"There was significant entanglements related to the French that caused Eden to reject these proposals, most of them stemmed from sentiments from the time he was Foreign Secretary and considerations at the time also in play. \n\nThere was a few pre... | [] | [] | [
[]
] |
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