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 |
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1uluyh | in movie scenes where a kidnapper asks for ransom money, why do they ask for non sequential bills? (extra credit: what are "marked bills"?) | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1uluyh/eli5_in_movie_scenes_where_a_kidnapper_asks_for/ | {
"a_id": [
"cejenfa"
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"score": [
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"text": [
"Because marked money can be tracked, sequential bills can be tracked. \n\nIn the case of the Lindbergh baby they wrote down the serial numbers of the bills and used them to track down the kidnapper/killer. \n\nSo lets say you kidnap someone and t... | [] | [] | [
[]
] | ||
5lmc08 | Did the Soviet Union and former Socialist countries in Eastern Europe had minimum wage laws? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/5lmc08/did_the_soviet_union_and_former_socialist/ | {
"a_id": [
"dbwyj1e"
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"text": [
"Yes, countries of the Eastern Bloc ratified conventions of International Labour Organization which, apart form other issues, dealt with the minimum wage. However those laws were basically meaningless, as the wages were set by the government anywa... | [] | [] | [
[]
] | ||
1xhwgg | why does beer foam subside so quickly when i touch my finger to the side of my nose, and then to the foam? | I know it must have to do with skin oils. But why? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1xhwgg/eli5_why_does_beer_foam_subside_so_quickly_when_i/ | {
"a_id": [
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"text": [
"Oils from your skin break the surface tension of the bubbles, and they just dissolve. It works with soda also."
]
} | [] | [] | [
[]
] | |
3y03h0 | why do people spoil movies? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/3y03h0/eli5why_do_people_spoil_movies/ | {
"a_id": [
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"text": [
"There is an emotion called *schadenfreude* which means taking joy in other people's suffering. Some people are mildly sadistic and like to annoy others; it gives them a sense of power that might compensate for some bad feeli... | [] | [] | [
[],
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] | ||
d8m9t9 | why do muscles take so little time to recover and grow compared to tendons and ligaments? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/d8m9t9/eli5_why_do_muscles_take_so_little_time_to/ | {
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"The really simple answer is that muscles are effectively made to be torn and damaged to regrow stronger. They're constantly getting minor \"damage\" as you use them, so major damage doesn't take too long to regenerate.\n\n... | [] | [] | [
[],
[]
] | ||
2o7vcl | Does anybody know the value of a Ruble in 1860? | I'm currently reading Crime and Punishment. The importance of poverty and money is already clear 100 pages in.
The money of the time, as you know, was Rubles. They also use Kopecks, which I believe are the equivalent to a USD cent?
My question is: What is the current USD equivalent of one Ruble and Kopeck? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/2o7vcl/does_anybody_know_the_value_of_a_ruble_in_1860/ | {
"a_id": [
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"text": [
"Are you talking paper ruble or metallic ruble?\n\nCatherine the Great started issuing paper rubles in 1768, and the value of these fluctuated greatly in the 18th and 19th centuries until the currency reforms of the 19th cent... | [] | [] | [
[],
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] | |
762ops | How long was the New Horizons probe in view of pluto and taking pictures for? | askscience | https://www.reddit.com/r/askscience/comments/762ops/how_long_was_the_new_horizons_probe_in_view_of/ | {
"a_id": [
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"*New Horizons* practically always had a view of Pluto, it was just really far away. The probe was launched on January 19, 2006, and took its first images of Pluto on September 21-24, 2006. It woke up from hibernation on December 7, 2014, and took... | [] | [] | [
[]
] | ||
qi5kk | What causes genius burnout? | askscience | http://www.reddit.com/r/askscience/comments/qi5kk/what_causes_genius_burnout/ | {
"a_id": [
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"Do you think that statistically geniuses exhibit more mental illness than the general public? ",
"In a psychology class I took, the professor said one contributing factor is that because of their intelligence levels, the... | [] | [] | [
[],
[]
] | ||
2h4y0s | what causes that strange feeling you get when you accidentally miss a step? | Okay, so this may seem really weird, but whenever I exit my school, I always go down the ramp because nobody ever uses that door. However, I took the main door, and I forgot that there was a little step right outside it. Because of this, when my foot didn't hit the ground where it was supposed to, I felt like I was fal... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2h4y0s/eli5_what_causes_that_strange_feeling_you_get/ | {
"a_id": [
"ckpqkzv"
],
"score": [
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],
"text": [
"Your body thinks you're losing balance and your defensive instincts or 'flight or fight response' kicks in to keep you unhurt."
]
} | [] | [] | [
[]
] | |
3ituyh | now that we know that "spooky action at a distance" is a confirmed phenomena of the quantum world, what does it mean? | I know whatever the average internet surfing Joe would know about Quantum mechanics. Mostly nothing.
What does this mean for general physics? I saw in the comments that this means we are all connected. Does that mean I am somehow connected to my plate of oreos? Or does this 'connection' work only from like to like, hu... | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/3ituyh/eli5_now_that_we_know_that_spooky_action_at_a/ | {
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"Quantum entanglement, or 'spooky action at a distance', is a phenomenon that can occur when two particles are created. I'll use spin as an example of a property that can be entangled. If two particles are created that are e... | [] | [] | [
[],
[
"Www.Qutech.nl"
]
] | |
wiy7g | can broccoli really reduce estrogen in men? | askscience | http://www.reddit.com/r/askscience/comments/wiy7g/can_broccoli_really_reduce_estrogen_in_men/ | {
"a_id": [
"c5dq14r",
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"text": [
"Perhaps you heard something like [this](_URL_1_)? \n > Indole-3-carbinol (I3C), a natural autolysis product of a gluccosinolate present in Brassica vegetables such as broccoli and cabbage, has anti-proliferative and **anti-e... | [] | [] | [
[
"http://www.ncbi.nlm.nih.gov/pubmed/11698343",
"http://www.ncbi.nlm.nih.gov/pubmed/20570586",
"http://www.ncbi.nlm.nih.gov/pubmed/10952093",
"http://www.ncbi.nlm.nih.gov/pubmed/9168187"
],
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"http://www.mskcc.org/cancer-care/herb/indole-3-carbinol",
"http://www.ncbi.nlm.nih.gov/pubmed/... | ||
ad29n8 | why can cloth soaked in boiled linseed oil spontaneously combust? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/ad29n8/eli5_why_can_cloth_soaked_in_boiled_linseed_oil/ | {
"a_id": [
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"score": [
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"text": [
"I think what is happening is the oil gives off a tiny bit of heat when it evaporates from the rag. Now by itself, that is no big deal. \n\nBUT, if you have ten or twenty or fifty of these rags jammed into a can or box or... | [] | [] | [
[],
[]
] | ||
1z1iiz | how the hairs in geckos' feet help them stick to glass? shouldn't hairs actually make their feet slippier? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1z1iiz/eli5_how_the_hairs_in_geckos_feet_help_them_stick/ | {
"a_id": [
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"text": [
"The 'hairs' on their feet are incredibly tiny and there is a huge amount of them. The hairs are so small that they are able to interact with the surface on an atomic level. The gecko sticks to glass using something called Van der Waal forces, whi... | [] | [] | [
[]
] | ||
1l5727 | What methods have been used to determine that space-time is 'curved'? | As I understand it, based on our current models, the universe is either infinite or it curves in on itself in something like a 4-dimensional sphere. Experiments have shown a measured 'curve' to the universe. I am curious as to what is measured to determine this. | askscience | http://www.reddit.com/r/askscience/comments/1l5727/what_methods_have_been_used_to_determine_that/ | {
"a_id": [
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"text": [
"[Gravity Probe B](_URL_0_) was an experiment that aimed to prove (and did) that space-time around Earth is curved due to it's gravity. \n\n",
"They waited till a solar eclipse and noted the positions of the stars located... | [] | [] | [
[
"https://en.wikipedia.org/wiki/Gravity_Probe_B"
],
[]
] | |
3vo2gi | why can't egypt take back their archaeological artifacts which have been stolen and are being displayed in the british museum and elsewhere? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/3vo2gi/eli5_why_cant_egypt_take_back_their/ | {
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... | [] | [] | [
[],
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1jbdnt | how do completely different strands of species all share similar qualities? (ex: mammals and amphibians both developing eyes in a similar fashion) | I've always found this question interesting. How can so many creatures that are seemingly unrelated develop such similar organ systems? Is it simply that we all share a common ancestor and evolved a similar basis for these qualities and then differentiated from them over time?
Thanks in advance! | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1jbdnt/eli5_how_do_completely_different_strands_of/ | {
"a_id": [
"cbcyzxl"
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"score": [
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"text": [
"There are two factors at work here:\n\nOne is **common ancestry**. All living things share a fairly small set of common ancestors. Living things that are more closely related to one another share a more recent common ancestor than things that a... | [] | [] | [
[]
] | |
38arht | how do animals recognize and remember humans? does this form of recognition vary between different species? | In a recent TIL, a man rescues a dying crocodile and nurses it back to health. He tries to release the crocodile to open waters but it kept coming back and they become "best friends" for 20 years. I've also read stories about people releasing animals they raised/took care of into the wild and after a few years, the ani... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/38arht/eli5_how_do_animals_recognize_and_remember_humans/ | {
"a_id": [
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"text": [
"The answer to the second question is yes. Some animals will not remember humans because it is not a part they have required in their brains.\n\nThat being said, those that do remember humans have a number of ways similar to our own senses, but on... | [] | [] | [
[]
] | |
362dlh | What was the migration experience like from England/France/Ireland around 1800 to farmland in the interior US? | I've been doing a lot of genealogical research and found that most branches of my family arrived in the US from Europe in the late 1700s and then spent one generation on the east coast (NJ, VA, NC typically) then traveled in-land to TN, KY, MO between 1800-1820. I want to learn more about that process. Most of them s... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/362dlh/what_was_the_migration_experience_like_from/ | {
"a_id": [
"cra1yhm"
],
"score": [
2
],
"text": [
"Pre Erie Canal meant that they most likely went through the Cumberland Gap and became subsistence farmers and shopkeepers in the Kentucky/Tennessee area before maybe moving farther south or west, but not for another generation. The threat of Indi... | [] | [] | [
[]
] | |
2glgcw | how does an imaginary number become an ordered pair? | I'm a 2nd year Computer Science major and I'm currently taking a pre-calc course. In class today we were going over complex numbers and the prof said, "We have expanded our mathematical system to include what are known as imaginary numbers... when you go on to higher mathematics an imaginary number can actually be used... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2glgcw/eli5_how_does_an_imaginary_number_become_an/ | {
"a_id": [
"ckk7wz7",
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"score": [
10,
4
],
"text": [
"First, your prof misspoke a little...he should have said *complex* numbers can be used as ordered pair.\n\nAll complex numbers are in the form *a + bi*, and it is sometimes useful to treat them as the ordered pair (*a*, *b*... | [] | [] | [
[],
[]
] | |
qh7dj | Is there any concrete scientific basis for hair going white after someone goes through a shocking experience? | I had a friend years ago who was 19 and had a permanent patch of white hair. She said it wasn't something that she had after birth but something that only appeared after she witnessed someone dying horrifically. The patch would not grow out- it remained in the same spot as her hair grew.
And I have seen sometimes in c... | askscience | http://www.reddit.com/r/askscience/comments/qh7dj/is_there_any_concrete_scientific_basis_for_hair/ | {
"a_id": [
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"text": [
"[Rogue](_URL_2_), but seriously there are several studies on this. [Here](_URL_0_) is a news article. [This](_URL_1_) is a scientific article that relates epinephrine to loss of pigment. Epinephrine is linked to flight-or-fight response system... | [] | [] | [
[
"http://www.telegraph.co.uk/news/worldnews/asia/japan/5505630/Grey-hair-is-a-sign-of-stress-say-scientists.html",
"http://www.nature.com/jid/journal/v53/n2/pdf/jid1969122a.pdf",
"http://www.lookpictures.net/photos/registered_photos/1846-x-men-rogue-wallpaper.jpg"
]
] | |
8xrt6d | what is the difference between hasidic judaism and standard judaism? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/8xrt6d/eli5_what_is_the_difference_between_hasidic/ | {
"a_id": [
"e255bu1"
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"text": [
"There isn't one \"standard\" Judaism. There are 3 main branches - reform, conservative, orthodox. They differ on how strictly they follow the religion and how they observe. Reform are the most lax and have somewhat adopted practices of some Chris... | [] | [] | [
[]
] | ||
6xd2zr | London is on a higher latitude than Montreal, why does it snow so rarely in comparison? | askscience | https://www.reddit.com/r/askscience/comments/6xd2zr/london_is_on_a_higher_latitude_than_montreal_why/ | {
"a_id": [
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"text": [
"The answer is [oceanic circulation](_URL_0_)\n\nThe eastern coast of North America is closer to the coldest ocean water, from the North pole. The gulf stream is responsible for Europe's milder climate.\n\nEurope however, enjoys the gulf stream. A... | [] | [] | [
[
"https://media1.britannica.com/eb-media/24/149024-004-B14614AA.jpg"
]
] | ||
1503pz | why don't we build pyramids anymore? | With the abundance of pyramids in ancient cultures, why don't we build them anymore? They seem to be structurally sound, and clearly stand the test of time. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1503pz/eli5_why_dont_we_build_pyramids_anymore/ | {
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"text": [
"Why would we want to? Rectangles are more space efficient.",
"Because they aren't very efficient.\n\nLets say we use modern construction techniques and f... | [] | [] | [
[],
[],
[
"http://en.wikipedia.org/wiki/Louvre_Pyramid",
"http://en.wikipedia.org/wiki/Luxor_Hotel",
"http://en.wikipedia.org/wiki/Pyramid_Arena",
"http://en.wikipedia.org/wiki/Pyramid#Modern_pyramids",
"http://en.wikipedia.org/wiki/Memphis,_Egypt"
],
[],
[]
] | |
2hshhc | Did the Romans charge citizens for the water that came through the massive aqueducts they built? | I posted this [link](_URL_0_) on /r/news and through discussion came to the posted question. So, using the power of reddit I ask you historians: Did the Romans charge citizens for the water that came through the massive aqueducts they built? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/2hshhc/did_the_romans_charge_citizens_for_the_water_that/ | {
"a_id": [
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"text": [
"Yes and no is the answer. The public fountains were most people got their water from were free and available for all. However water that was delivered to private homes via the city's water mains and metered with officially calibrated nozzles w... | [] | [
"http://www.reddit.com/r/news/comments/2hsbqu/judge_wont_stop_shutoffs_says_no_right_to_free/ckvk98d?context=3"
] | [
[
"http://www.uvm.edu/~rrodgers/Frontinus.html"
]
] | |
4kpacq | Are there any estimates of how many Japanese citizens evacuated Hiroshima and Nagasaki due to the US Air Force's air dropped leaflets warning the public of what was about to happen? | Growing up I always assumed there was very little warning for the Japanese leading up to the nuclear strikes on Hiroshima and Nagasaki, however I recently learned about the US warning campaign (which can be read about here _URL_0_ ) which is something I haven't really heard brought up before.
My question is are there ... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/4kpacq/are_there_any_estimates_of_how_many_japanese/ | {
"a_id": [
"d3gtrub",
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"score": [
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"text": [
"[Here is an earlier answer that might be helpful](_URL_0_). The short answer is \"no-one\" and that _URL_1_ is a terrible source.",
"There were no specific warnings that Hiroshima, Nagasaki, or Kokura (the primary target... | [] | [
"http://www.damninteresting.com/ww2-america-warned-hiroshima-and-nagasaki-citizens/"
] | [
[
"https://www.reddit.com//r/AskHistorians/comments/35alc2/what_was_the_reaction_to_the_us_pamphlets_dropped/?sort=top",
"daminteresting.com"
],
[
"http://blog.nuclearsecrecy.com/2014/03/12/firebombs-usa/",
"http://blog.nuclearsecrecy.com/wp-content/uploads/2015/08/Nagasaki-damage-map-detail.jpg... | |
1ezmmi | What was Napoleon's life on St. Helena like? | I know he made complaints about his living conditions, and that some of the locals found him to a be charming person. Was he depressed at all about his failures? And did he have any contact with his family? Any intersting anecdotes, or recommended related reading, would be appreciated. | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1ezmmi/what_was_napoleons_life_on_st_helena_like/ | {
"a_id": [
"ca5exqb",
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"score": [
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153,
13
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"text": [
"Here’s the famous account by Emmanuel-Auguste-Dieudonné, Comte de Las Cases in his *Memoirs of the Life, Exile, and Conversations of the Emperor Napoleon* (trans 1894, p. 164). It’s vivid, but Las... | [] | [] | [
[],
[],
[]
] | |
4f1f5s | What makes electomagnetic waves able to propagate without a medium and other not other waves?? | askscience | https://www.reddit.com/r/askscience/comments/4f1f5s/what_makes_electomagnetic_waves_able_to_propagate/ | {
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"score": [
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"text": [
"You could say that electromagnetic (EM) waves *do* propagate in a medium, if you take that medium to be the ... | [] | [] | [
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"https://en.wikipedia.org/wiki/Casimir_effect",
"http://i.imgur.com/0GVQpYy.jpg"
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"https://www.reddit.com/r/askscience/comments/3pkw1m/how_is_it_that_electromagnetic_waves_can_travel/"
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"https://www.youtube.com/watch?v=PNwqZsCBQkQ"
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1vosex | why did the 1997 asian financial crisis take place? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1vosex/eli5_why_did_the_1997_asian_financial_crisis_take/ | {
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"text": [
"The depreciation of value of Thailand's currency combined with the lack of financial policy to handle the event is the starting point. Thailand and some other countries had fixed or semi-fixed currency exchange rates which contributed to deficits... | [] | [] | [
[]
] | ||
4kfbdb | When building, how did the Romans maintain and measure the aqueduct water gradients? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/4kfbdb/when_building_how_did_the_romans_maintain_and/ | {
"a_id": [
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"text": [
"Fairly certain there is something here in De architectura\n_URL_0_\n\nSearched for you, page 244\n\"let the bed of the channel have a gradient of not less than a quarter of an inch for every hundred feet\"\n\nThe next question is 'why,' and in th... | [] | [] | [
[
"http://www.gutenberg.org/files/20239/20239-h/29239-h.htm"
]
] | ||
51z6oz | how can reducing the size of an object increase its surface area? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/51z6oz/eli5_how_can_reducing_the_size_of_an_object/ | {
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"text": [
"I believe that what they mean is that more surface area in *total* is exposed, increasing the reaction rate. \n \nSay you have a perfect sphere, submerged in liquid. Right now, the area exposed to th... | [] | [] | [
[],
[],
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1zg6xk | why aren't more policemen (who are seemingly losing cases) allowing people to demonstrate their right to record them? why are they still trying to stop the recordings? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1zg6xk/why_arent_more_policemen_who_are_seemingly_losing/ | {
"a_id": [
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"text": [
"In general, cops don't want to be recorded while working as if they make a mistake or push the boundary too far, it can bite them in the ass later. \n\nI'm not sure what your job is, but how would you feel if every action yo... | [] | [] | [
[],
[]
] | ||
jiqm7 | how does a plane fly? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/jiqm7/eli5_how_does_a_plane_fly/ | {
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"text": [
"The plane is pushed forward by either propellers or jet engines. Propellers work just like a fan and push air backwards. Jet engines also push air backwards, but push much hard... | [] | [] | [
[],
[],
[],
[]
] | ||
17g08g | How were the dead, enemy and friendly, dealt with after a battle(s) in your area of study/research/expertise? | How were the dead, enemy and friendly, dealt with after a battle(s) in your area of study/research/expertise?
Were they immediately buried? Burnt? And if not, did this ever have any grave ramifications for any army in the sense of disease?
I am familiar with Islamic empires, that they would command their people/soldi... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/17g08g/how_were_the_dead_enemy_and_friendly_dealt_with/ | {
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"During the Siege of Tobruk (North Africa, 1941. Australia plus some Commonwealth and Poles vs Germans and Italians) it wasn't uncommon, in fact it was somewhat common, for a truce to be declared after a battle to clear the battlefield of the dea... | [] | [] | [
[]
] | |
1j4b5g | If animals have no awareness of death, where does the "playing dead" reaction come from? | askscience | http://www.reddit.com/r/askscience/comments/1j4b5g/if_animals_have_no_awareness_of_death_where_does/ | {
"a_id": [
"cbaydty",
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"A concept of death isn't required for the playing dead instinct to develop. All that is required is that playing dead function successfully as a defense.\n\nIt is important to note, most predators prefer fresh killed animals... | [] | [] | [
[
"https://en.wikipedia.org/wiki/Apparent_death"
],
[]
] | ||
3nc44q | how do companies discover that they've been hacked? | If you're a smart hacker, couldn't you figure out how to access information without anyone knowing that you did it? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/3nc44q/eli5_how_do_companies_discover_that_theyve_been/ | {
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"If a good hacker didn't leave a footprint then the company wouldn't know about the leak, and you would never hear about the company having a leak.\n\nThe Sony hack wasn't notice... | [] | [] | [
[],
[],
[],
[]
] | |
vpeba | How are pre-Gregorian dates handled? | I'm hoping this is a simple question with a simple answer.
What's the convention for dates before the invention of the Gregorian calendar? Can I assume that they're Julian dates?
For example, Joan of Arc died on 30 May 1431. This is what's listed everywhere. I would assume that this date is based on contemporary docu... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/vpeba/how_are_pregregorian_dates_handled/ | {
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" > The Gregorian calendar can, for certain purposes, be extended backwards to dates preceding its official introduction, producing [the proleptic Gregorian calendar, ](_URL_0_)but this proleptic calendar should be used with great caution.\n\n > ... | [] | [
"http://www.fourmilab.ch/documents/calendar/"
] | [
[
"http://en.wikipedia.org/wiki/Gregorian_calendar#Proleptic_Gregorian_calendar",
"http://www.wolframalpha.com/entities/person_death_date/when_did_joan_of_arc_die/cg/xi/n0/"
]
] | |
3wr1cz | How come The majority of cars run on internal piston combustion engines over turbofan engines? | how come 99% of fossil fuel driven cars use a piston engine? planes, helicopter, and even tanks have switch to more effective methods, i.e. gas turbine engines, and havn't used piston driven engines since WW2. I know there were projects to make gas turbine cars, Chrysler had a car _URL_1_ as well as jaguar has a super... | askscience | https://www.reddit.com/r/askscience/comments/3wr1cz/how_come_the_majority_of_cars_run_on_internal/ | {
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"Turbines become much less efficient as you scale them down. Turbine speed is limited by the blade tip velocity, which must stay below the speed of sound. Smale turbojets run at tens of thousands up to a hundred thousand rp... | [] | [
"https://en.wikipedia.org/wiki/Jaguar_C-X75",
"https://en.wikipedia.org/wiki/Chrysler_Turbine_Car"
] | [
[],
[]
] | |
4e5f3b | how does my stone age brain manage to drive a car safely, while my mind wanders into oblivion and thoughts about sex | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4e5f3b/eli5how_does_my_stone_age_brain_manage_to_drive_a/ | {
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"By scaring the shit out of all the drivers around you so that *they* have to pay close attention to their driving. And thank their luc... | [] | [] | [
[],
[],
[],
[],
[],
[]
] | ||
zdjf3 | with the proper suit would it be possible to space jump? | I understand entering the atmosphere would be one of the bigger issues, I'm just curious if it would be a viable idea as a last resort to get home from the space station. | askscience | http://www.reddit.com/r/askscience/comments/zdjf3/with_the_proper_suit_would_it_be_possible_to/ | {
"a_id": [
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"text": [
"Space and orbit are different things. From space, sure. You just fall down the same as anywhere. There's no terminal velocity while outside atmosphere so you just keep on gaining speed. The shielding you need then depends on what your speed is wh... | [] | [] | [
[]
] | |
34kzuv | What are the major difference and similarities between a peasant living in southern France in 800 and one living in 1300? | On balance which are greater, the similarities or the differences? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/34kzuv/what_are_the_major_difference_and_similarities/ | {
"a_id": [
"cqvxhcv"
],
"score": [
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"text": [
"There is a chance that your 'peasant' during the Carolingian period in southern France could have been a slave and not a free peasant, the odds depending on which historian's calculations you trust. By 1300 slavery had been extinguished in sout... | [] | [] | [
[]
] | |
1kbjl7 | I've just learned about the fabulous life and horrible death of Ludwig II of Bavaria. What's a good source for the layman of more information about him? More questions in comments. | I'm scouring the internet at present in a state of wonderment. Questions I have:
* Was he really insane? He seems unbalanced in a tragic and fantastic way, but what I'm reading seems to fall short of what we would call insane today.
* Was he straight-up gay? I'm finding references to his troubles in finding his sexual... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1kbjl7/ive_just_learned_about_the_fabulous_life_and/ | {
"a_id": [
"cbnxz4p"
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"score": [
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"text": [
"I'm kind of surprised and disappointed that no one has anything to offer on this topic. But that's infinitely better than a subreddit where people who know nothing speculate, so hats off to /r/AskHistorians anyway."
]
} | [] | [
"http://www.schwangau.de/his-mysterious-death-646.html"
] | [
[]
] | |
1pzg8y | Why are Half Tracks no longer a prominent military vehicle? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1pzg8y/why_are_half_tracks_no_longer_a_prominent/ | {
"a_id": [
"cd7o274"
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"score": [
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"text": [
"This is more of a technology than history question, and it risks veering into speculation.\n\nMy take is that wheeled vehicles have simply gotten better. Tracks are primarily useful for gaining traction on soft ground with a heavy vehicle. Half-... | [] | [] | [
[]
] | ||
5bsbsk | If two power plants feed AC voltage/current into the same electricity grid, how do we make sure they are in the same phase to not cancel out each other? | If two power generators feed a sinusoidal voltage into the grid, but one has a phase difference of 180° to the other, wouldn't the voltages cancel each other out?
So after the voltage of the power plant is transformed into the appropriate voltage, how do we make sure the voltages have appropriate phase differences? ... | askscience | https://www.reddit.com/r/askscience/comments/5bsbsk/if_two_power_plants_feed_ac_voltagecurrent_into/ | {
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... | [] | [] | [
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"https://en.wikipedia.org/wiki/Synchronization_\\(alternating_current\\)"
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[
"https://www.scientificamerican.com/article/how-is-electricity-from-d/"
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[],
[],
[
"https://en.wikipedia.org/wiki/Synchroscope"
],
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[],
[],
[],
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[],
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e0ffne | How widespread was anti-Irish sentiment in the United States in the late 1800s-mid 1900s, particularly the infamous "No Irish Need Apply" signs? | While looking into information on the debate of Irish slavery in America, I spied a "No Irish Need Apply" sign, and remembered seeing one in a video game set in a steampunk Victorian-esque city (Bioshock Infinite). While information is clear that anti-Irish sentiment was rampant in the United Kingdom, to what degree wa... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/e0ffne/how_widespread_was_antiirish_sentiment_in_the/ | {
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"text": [
"I have [an earlier answer](_URL_0_) on \"No Irish Need Apply\" signs and ads (and how historians have talked about this). In the U.S., they were particularly prominent in jobs advertised to women--wh... | [] | [] | [
[
"https://www.reddit.com/r/AskHistorians/comments/5zkvxc/where_are_we_on_no_irish_need_apply/dezgicp/"
],
[
"www.jstor.org/stable/1147625",
"www.jstor.org/stable/3554982"
],
[
"https://www.reddit.com/r/AskHistorians/comments/5zkvxc/where_are_we_on_no_irish_need_apply/dezgicp/"
]
] | |
ze8d8 | What are some good resources for learning how to name chemical compounds? | askscience | http://www.reddit.com/r/askscience/comments/ze8d8/what_are_some_good_resources_for_learning_how_to/ | {
"a_id": [
"c63sxu8"
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"score": [
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"text": [
"IUPAC naming conventions for organic molecules: \n_URL_1_\n\nMore here:\n_URL_2_\n\nIUPAC inorganic nomenclature is summarised here:\n_URL_0_"
]
} | [] | [] | [
[
"http://en.wikipedia.org/wiki/IUPAC_nomenclature_of_inorganic_chemistry",
"http://en.wikipedia.org/wiki/IUPAC_nomenclature_of_organic_chemistry",
"http://www.acdlabs.com/iupac/nomenclature/"
]
] | ||
4oi2o1 | why do so many websites have formatting issues with line breaks? | Like Reddit, for example. Why is it that some websites have no problem displaying line breaks in your text entry, while some websites need you to do something like and some brackets or symbols to indicate that there is a line break? Sorry I have a bad habit of rambling, so I'll leave it at that, I guess. Perhaps a bett... | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4oi2o1/eli5_why_do_so_many_websites_have_formatting/ | {
"a_id": [
"d4crjfz"
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"score": [
4
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"text": [
"Pure HTML is whitespace-insensitive. That means that all blank space, except for a single space between words, is ignored. This is convenient from a developer point of view, because it means you can space your markup for easy editing without brea... | [] | [] | [
[]
] | |
92x8a6 | what does chewing gum do to us? our teeth, mental all that | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/92x8a6/eli5_what_does_chewing_gum_do_to_us_our_teeth/ | {
"a_id": [
"e39b1ua"
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"text": [
"The effect chewing gum has on the teeth really depends on the type of gum you are chewing. If the gum contains sugar, it might create an opportunity for bacteria on the teeth to multiply and cause tooth decay. However, just as with other forms of... | [] | [] | [
[
"https://www.ncbi.nlm.nih.gov/m/pubmed/19356310/"
]
] | ||
1uy31m | What was the impact of the East/West split in Germany on modern nationalistic identity and culture? Do people identify as East/West/(region) German or just German? | I've always been interested on the impact that re-unification has had on Germany, rather, the impact of the split. Did people like the split at the time/when they were unified? What was its impact? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1uy31m/what_was_the_impact_of_the_eastwest_split_in/ | {
"a_id": [
"cemv7u2",
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"(As far as I know) most nationalists identify themselves as \"german\", and not as east/west/south/however-german. But of course there are always a few people identifying themselve more as a bavarian, or are exspecially prou... | [] | [] | [
[],
[]
] | |
3un1rw | How concrete was Christendom as a concept of European political union in the Middle Ages? | Came across [this](_URL_0_) post the other day and would like some further information about this bit in particular:
> Medieval politics, as I've already mentioned, was oriented around the idea of Christendom. The Christian monarchs formed a single community known as the Res Publica Christiana or, if you like, "Chris... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/3un1rw/how_concrete_was_christendom_as_a_concept_of/ | {
"a_id": [
"cxg8ltq"
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"score": [
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"text": [
"The now-deleted writer of that post mentions *Res Publica Christiana* which frankly is something of a post-facto historiographic idea. It has a problem on two fronts. The first is that the self-conception as a Christian ruler is utterly obvious: ... | [] | [
"https://www.reddit.com/r/AskHistorians/comments/18zrj5/what_was_the_international_system_for_lack_of_a/c8jrvbl"
] | [
[
"https://www.reddit.com/r/AskHistorians/comments/3qyw8y/how_exactly_did_the_papalmedieval_inquisition/cwjh6b6"
]
] | |
qt1vw | Strongest Theoretical Earthquake/Seismic Wave? | I know the Richter Scale goes up to 10.0 at the minimum and that an increase in 1 is roughly equal to a 32 times increase in energy released. I also know that the highest recorded in Human History is about 9.5 on the scale, but never anything in the 10s. So I'm highly curious what the strongest theoretical earthquake i... | askscience | http://www.reddit.com/r/askscience/comments/qt1vw/strongest_theoretical_earthquakeseismic_wave/ | {
"a_id": [
"c40c6wp"
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"score": [
2
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"text": [
"This was [covered a past thread](_URL_0_); there was some good discussion."
]
} | [] | [] | [
[
"http://www.reddit.com/r/askscience/comments/g1y4b/the_most_powerful_earthquake_in_recorded_history/"
]
] | |
3ajfz0 | Why does water get larger when the temperature gets lower? With other materials happens the contrary | askscience | http://www.reddit.com/r/askscience/comments/3ajfz0/why_does_water_get_larger_when_the_temperature/ | {
"a_id": [
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"text": [
"Water exhibits this property because of Hydrogen bonds between adjacent H2O molecules. Basically, water is a polar molecule (Oxygen is the negative pole and the Hydrogens are the weaker positive poles), so the Oxygens in mol... | [] | [] | [
[],
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"http://www1.lsbu.ac.uk/water/images/ice_3_1.gif",
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"http://www1.lsbu.ac.uk/water/images/ice_water_density_1.gif"
]
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cbgh5e | why do humans start feeling hot and sweaty when nervous? | [deleted] | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/cbgh5e/eli5_why_do_humans_start_feeling_hot_and_sweaty/ | {
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"text": [
"It’s the part of your nervous system that protects you when you’re in danger. Your body is designed to run away from tigers and such, not take tests or speak in public. Having yo... | [] | [] | [
[],
[],
[],
[]
] | |
9roe48 | how do tanks (and similar vehicles) turn left/right? | [deleted] | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/9roe48/eli5_how_do_tanks_and_similar_vehicles_turn/ | {
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"The left and right tracks turn at different speeds. The engines have enough strength (torque) that they'll scrape across the ground as they rotate ",
"One turns forwards, the other turns backward (o... | [] | [] | [
[],
[],
[]
] | |
771kc3 | Did the Wehrmacht commit a disproportionally large amount of war crimes compared to, say, the Red Army or any other Allied forces? | I'm aware of the Clean Wehrmacht myth, but I'm just curious if they committed more war crimes than the Allies. | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/771kc3/did_the_wehrmacht_commit_a_disproportionally/ | {
"a_id": [
"doj3xmq"
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"score": [
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"text": [
"**Part 1**\n\nYes.\n\nThe Wehrmacht not only quantitatively committed more war crimes but also, and this can not be emphasized enough, the way they waged war during WWII was criminal from the outset as a matter of institutional policy. And not ju... | [] | [] | [
[
"http://www.victimsheroessurvivors.info/VictimsHeroesSurvivors.pdf"
]
] | |
jbg6d | When studying electromagnetic forces, how do you picture them? | While studying physics, I was always worse at these fields, such as electricity and magnets, for I couldn't picture them in my head as I could with Kinetics and Thermodynamics.
How does your minds eye see these forces, if not as themselves?
(I often pictured simple circuits as rivers for example) | askscience | http://www.reddit.com/r/askscience/comments/jbg6d/when_studying_electromagnetic_forces_how_do_you/ | {
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4,
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"text": [
"Be careful with the language. An electromagnetic *field* is different from an electromagnetic *force*. A *field* occupies space like a... | [] | [] | [
[
"http://upload.wikimedia.org/wikipedia/commons/thumb/6/6d/Irrotationalfield.svg/300px-Irrotationalfield.svg.png"
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[],
[],
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"http://upload.wikimedia.org/wikipedia/commons/thumb/6/6d/Irrotationalfield.svg/300px-Irrotationalfield.svg.png"
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1o2vib | why household bathroom shower heads come from the wall and not the ceiling. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1o2vib/eli5_why_household_bathroom_shower_heads_come/ | {
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"text": [
"The pipes are in the wall, and the water comes from beneath the house, so it is not efficient to pump the water any higher than necessary.\n\nThe way buildings are made today, ther... | [] | [] | [
[],
[],
[],
[]
] | ||
3azhxi | why we haven't taken any images of black holes? | Even a black region surrounded by warped light and a backdrop of stars would suffice... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/3azhxi/eli5_why_we_havent_taken_any_images_of_black_holes/ | {
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"Because all the ones we know about are really far away and shrouded in tons of gas and dust making them camoflouged.\n\nWe have xray images of the blackhole at the center of our galaxy, but they are only xrays. You can't re... | [] | [] | [
[],
[]
] | |
4c6iwb | how directional speakers (and directional sound in general) work | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4c6iwb/eli5_how_directional_speakers_and_directional/ | {
"a_id": [
"d1fgu0g",
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"score": [
3,
2
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"text": [
"Sound is the vibration of air particles. Taking to in a room is like standing in a swimming pool and splashing around, everybody gets wet. \n\nDirectional speakers are more like you holding one end of a slinky, and your frie... | [] | [] | [
[],
[]
] | ||
6quj0f | why is it that some people need to adjust their sitting posture every 2 minutes but some people can sit in the same posture for one hour? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/6quj0f/eli5_why_is_it_that_some_people_need_to_adjust/ | {
"a_id": [
"dl03raa"
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"score": [
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"text": [
"I was actually thinking about this the other day because I'm the kind of person seems to never get comfortable. I found out if you stretch and loosen up your muscles you'll have an easier time sitting still or even falling asleep at night."
]
} | [] | [] | [
[]
] | ||
6wgzvy | AskHistorians Podcast 093 - The Holy Roman Empire in the Age of Martin Luther | [**Episode 93 is up!**](_URL_7_)
The [AskHistorians Podcast](_URL_11_) is a project that highlights the users and answers that have helped make /r/AskHistorians one of the largest history discussion forums on the internet. You can subscribe to us via [iTunes](_URL_5_), [Stitcher](_URL_3_), or [RSS](_URL_2_), and now o... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/6wgzvy/askhistorians_podcast_093_the_holy_roman_empire/ | {
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"score": [
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"text": [
"Listeners! Ignore not the reference to [Youtube](_URL_0_)! We are steadily working through the backlog of old ep... | [] | [
"https://soundcloud.com/user679855208",
"https://www.youtube.com/channel/UCJudPwztZyg2BQjhetw_bww",
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"http://www.stitcher.com/podcast/tas-stacey/the-askhistorians-podcast",
"https://www.reddit.com/r/AskHistorians/comments/6t2oq4/askhistorians_podcast_092_what_is_facism/... | [
[
"https://www.youtube.com/c/askhistorianspod"
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12hox0 | As far as we know, is matter continuous or discrete? | I know that matter is made up of atoms, and that they are made of particles which are made of quarks, but do physicists think that we can keep dividing matter like this forever? Or, is there theoretically a "smallest" particle? | askscience | http://www.reddit.com/r/askscience/comments/12hox0/as_far_as_we_know_is_matter_continuous_or_discrete/ | {
"a_id": [
"c6v47hu"
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"score": [
3
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"text": [
"There is a theorised smallest length, called the \"planck length\". In short, it's the absolute minimum length that it is theoretically possible to measure, regardless of how good our measuring technology becomes. I've heard it referred to as the... | [] | [] | [
[
"http://en.wikipedia.org/wiki/Planck_length"
]
] | |
aw60gd | Did the Greeks have an "End of the World" scenario like Christianity and Revelations or the Norse and Ragnarok? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/aw60gd/did_the_greeks_have_an_end_of_the_world_scenario/ | {
"a_id": [
"ehknnt3"
],
"score": [
118
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"text": [
"Not really - or at least nothing so dramatic. \n\nIn his *Works and Days*, Hesiod (borrowing generously, if probably unconsciously, from Near Eastern myth) describes a succession of the five ages or generations of men who have populated the ear... | [] | [] | [
[]
] | ||
759h03 | - why does pr not have statehood? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/759h03/eli5_why_does_pr_not_have_statehood/ | {
"a_id": [
"do4ed6o"
],
"score": [
2
],
"text": [
"See my earlier answer to your removed thread:\n\nPuerto Rico held four recent referendums to establish whether the population wanted a change in status. Until recently, the vote was either only narrowly in favour of statehood, or favoured remaini... | [] | [] | [
[]
] | ||
r7iof | When looking at ferromagnetic compounds which form of iron is more magnetic, Fe2+ or Fe3+ or is there any real noticeable difference in magnetism? Also what is the difference between ferro- and ferri- magnetism? | askscience | http://www.reddit.com/r/askscience/comments/r7iof/when_looking_at_ferromagnetic_compounds_which/ | {
"a_id": [
"c43oy13"
],
"score": [
3
],
"text": [
"Insofar as magnetism can be somewhat proportional to the total number of unpaired spins in an atom..... it depends. Depending on the environment of the iron atoms, the relevant electrons that they have will be arranged differently.\n\nEssentiall... | [] | [] | [
[]
] | ||
4kdkk2 | dark souls | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4kdkk2/eli5_dark_souls/ | {
"a_id": [
"d3e3m7y"
],
"score": [
2
],
"text": [
"There isn't really a storyline to Dark Souls. \n\n[Here](_URL_0_) is a video explaining a bit more."
]
} | [] | [] | [
[
"https://youtu.be/LueVmefY_Kg"
]
] | ||
3m8r7s | can someone please explain zodiac signs and why people think they know you based on your "sign"? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/3m8r7s/eli5_can_someone_please_explain_zodiac_signs_and/ | {
"a_id": [
"cvcyuju",
"cvcz2k4",
"cvd1bot"
],
"score": [
6,
3,
2
],
"text": [
"In our evolutionary history, spotting patterns was very advantageous. In fact, it was much better to spot a pattern when none existed than to not spot one that did exist. Consequently, people who were g... | [] | [] | [
[
"horoscopes.com"
],
[],
[]
] | ||
exnjud | what’s the scientific meaning of medium? is it just the states of solid liquid and gas? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/exnjud/elif_whats_the_scientific_meaning_of_medium_is_it/ | {
"a_id": [
"fga1wq8",
"fgaxskp",
"fgbonoc"
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"score": [
8,
3,
2
],
"text": [
"I think it just means surroundings.\n\nIn Chemistry, if a reaction occurs in an 'acidic medium', the reaction will only occur when surrounded by acidic radicles.\n\nIn Physics, if sound travels faster i... | [] | [] | [
[],
[],
[]
] | ||
1fyl5i | How does anti-microbial plastic work? | I have at home a chopping board made from plastic which claims to be anti-microbial. I would like to know how the plastic or whatever is in/on it actually kills the microbes. Thanks! | askscience | http://www.reddit.com/r/askscience/comments/1fyl5i/how_does_antimicrobial_plastic_work/ | {
"a_id": [
"caf9t1k"
],
"score": [
2
],
"text": [
"The material the fomite is made of helps to reduce or prevent the growth of colonies due to the non-porous nature of the material. It can't hold water and nutrients well, so the bacteria typically do not have a healthy environment to vegetate. Wh... | [] | [] | [
[]
] | |
7gsg9n | Did Western Europe ever have mounted archers? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/7gsg9n/did_western_europe_ever_have_mounted_archers/ | {
"a_id": [
"dqlll7z"
],
"score": [
27
],
"text": [
"I think [this](_URL_0_) might help"
]
} | [] | [] | [
[
"https://www.reddit.com/r/askhistorians/comments/3mnv8j/_/"
]
] | ||
1dyxs3 | why is the cleveland kidnapper only charge with 3 counts of rape, one for each victim rather than 10 years of rape? | Surely raping a person regularly of 10 years is more of a crime than raping them once. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1dyxs3/eli5_why_is_the_cleveland_kidnapper_only_charge/ | {
"a_id": [
"c9v6fpl",
"c9v7esj",
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"c9ve1a0"
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"score": [
28,
16,
2,
2
],
"text": [
"Becuase they have plenty of time to charge him with more later. They just threw out a few charges so they can hold him for now.",
"Because the charges will read Rape of Vict... | [] | [] | [
[],
[],
[],
[]
] | |
66gmqt | why can't mobile phones have optical zoom? | I get that you need space for the lens to move, but wouldn't a few mm already be enough for 2x or 3x optical zoom? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/66gmqt/eli5_why_cant_mobile_phones_have_optical_zoom/ | {
"a_id": [
"dgibkdr",
"dgicmfz"
],
"score": [
2,
2
],
"text": [
"They can, I think iPhone 7 Plus reveal boasted it has 2x optical zoom. But it turned out while it is there the phone doesn't always use optical zoom first.",
"As others pointed out, some do. But the advantages can be que... | [] | [] | [
[],
[]
] | |
q3tbn | Is it still possible to get aroused after having your testicles/penis removed? | I know it is possible to have your penis/testes removed to to cancer or other unfortunate events. So I was wondering, can you still get sexually aroused without testicles and/or penis? | askscience | http://www.reddit.com/r/askscience/comments/q3tbn/is_it_still_possible_to_get_aroused_after_having/ | {
"a_id": [
"c3uj8d5"
],
"score": [
3
],
"text": [
"There is an episode of TLC's \"Strange Sex\" where a paraplegic man is able to achieve orgasm via thumb massage. I cannot find a clip of this segment on the web, only discussion.\n\nHere is a link with some more information - borderline NSFW - [... | [] | [] | [
[
"http://www.streetsie.com/spinal-injury-wheelchair-sex/"
]
] | |
55o6l9 | Why is sodium chloride the dominant salt in seawater? | Why sodium instead of lithium, potassium, etc? Why chloride instead of sulphate, phosphate, etc? | askscience | https://www.reddit.com/r/askscience/comments/55o6l9/why_is_sodium_chloride_the_dominant_salt_in/ | {
"a_id": [
"d8c9un1",
"d8cc73n",
"d8cp0wr",
"d8cxruc"
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"score": [
1382,
33,
75,
20
],
"text": [
"So when considering this question, we have to consider two things. First, what are the concentrations of each element on earth? Second, what chemical form(s) is each element ... | [] | [] | [
[
"https://en.wikipedia.org/wiki/Abundance_of_elements_in_Earth%27s_crust"
],
[],
[
"http://www.sciencedirect.com/science/article/pii/003358947190041X"
],
[
"https://en.wikipedia.org/wiki/Pitzer_equations"
]
] | |
3icgpv | candidates love saying it, how exactly would we "abolish the irs"? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/3icgpv/eli5candidates_love_saying_it_how_exactly_would/ | {
"a_id": [
"cuf71k0"
],
"score": [
5
],
"text": [
"We would eliminate all income tax. The IRS (and all the things that go along with it; e.g. filing taxes every year) is a fairly new creation; for most of the USA's history the government acquired taxes on things like trade and property.\n\nThere... | [] | [] | [
[]
] | ||
106i3o | Do humans have a sleep bank? | For a teenager, the recommended amount of sleep is 9.5 hours.
Now, for the average teenager, this number is close to impossible. But, if they take a 2 hour nap and then sleep for 7.5 hours do they achieve the same benefit if they to have slept for 9.5 hours?
Basically, does a nap add to the hours you slept that night... | askscience | http://www.reddit.com/r/askscience/comments/106i3o/do_humans_have_a_sleep_bank/ | {
"a_id": [
"c6at8wg"
],
"score": [
12
],
"text": [
"Not getting enough sleep can accumulates in what is called [sleep debt](_URL_0_). As for recommended amount of sleep, it varies from person to person, as each person's sleep cycle has a different duration. On average, you should get 3 sleep cycl... | [] | [] | [
[
"http://en.wikipedia.org/wiki/Sleep_debt"
]
] | |
dbeoi2 | what is a parsec | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/dbeoi2/eli5_what_is_a_parsec/ | {
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"score": [
36,
2,
18,
3,
3,
5,
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"text": [
"It is short for Parallax of 1 arcsecond.\n\nBasically, it is the distance from Earth got a... | [] | [] | [
[],
[],
[],
[
"https://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&ved=2ahUKEwigzZjWjPnkAhWVpp4KHYdCB6AQjRx6BAgBEAQ&url=https%3A%2F%2Fearthsky.org%2Fspace%2Fwhat-is-a-parsec&psig=AOvVaw0d1oH5n58MpPGoyMD3KXrJ&ust=1569951878554265"
],
[],
[
"https:... | ||
4sxzm2 | Just 5 short years after the USA crushed their enemies, the Japanese, and helped defend their mainland, the USA and China would be at war in Korea. How did Chinese public opinion of the USA fluctuate in that time period? | Sorry if the title downplays Chinese involvement in WW2 or overstates American contributions, I'm not highly educated in the Pacific theater in relation to China and their part in the war, other than the atrocities committed to them by Japan. | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/4sxzm2/just_5_short_years_after_the_usa_crushed_their/ | {
"a_id": [
"d5d4vdo"
],
"score": [
27
],
"text": [
"Not my area of study and others are almost certainly better able to answer this question than I am, but the basic answer is that China fell to the communists. I'm more familiar with the changes in US public perception, for instance over the deba... | [] | [] | [
[
"https://en.wikipedia.org/wiki/Battle_of_Chosin_Reservoir",
"https://en.wikipedia.org/wiki/Loss_of_China"
]
] | |
1u1vhm | How important was the Book of John the Evangelist to Cathar theology? | I've been doing research into the Cathar heresy, and I've been particularly interested in the theological tensions between orthodox doctrine and many pre-existing, local dualist beliefs in regions where Catharism gained traction. Given the relative lack of a non-hostile primary source base to outline a picture of Catha... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1u1vhm/how_important_was_the_book_of_john_the_evangelist/ | {
"a_id": [
"cedwnw1"
],
"score": [
7
],
"text": [
"The Cathars did not exist.\n\nThat is to say, the heretics who have come to be described as Cathars of 12-13th century never called themselves that, there is scant evidence of actual organization of these heretics of this period into anything tha... | [] | [
"http://www.fordham.edu/halsall/source/cathar-gospel.asp"
] | [
[
"http://rimoore.net/GoodMen.html"
]
] | |
13xydc | Is String Theory falsifiable? | String theory has been around for decades now, but I don't know how it suggests any observations that deviate from those suggested by the Standard Model.
So my question is: is String Theory falsifiable? If not, isn't just mathematical philosophy and not science? | askscience | http://www.reddit.com/r/askscience/comments/13xydc/is_string_theory_falsifiable/ | {
"a_id": [
"c785zct",
"c78imgb"
],
"score": [
23,
3
],
"text": [
"Not yet. It's not ready. It can take a long time to figure out what a theory implies.\n\nHowever, if you generalize your question and ask \"Can string theory as a technique make predictions about a non-stringy universe\" th... | [] | [] | [
[],
[]
] | |
eppwky | What does data look like physically? | For instance, when I save an MS word document, or save data in a video game, those specific bits of info, what do they look like physically, and how is it stored? How does that work? | askscience | https://www.reddit.com/r/askscience/comments/eppwky/what_does_data_look_like_physically/ | {
"a_id": [
"felof9k",
"felx19x",
"fembeax",
"feoasp2"
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"score": [
5,
35,
6,
3
],
"text": [
"depends on “where it is” is the computer.\nbut “physically” (go with me here):\n\nData is normally stored on a disk drive. Everything brakes down to binary which is 1s and 0s. \nI... | [] | [] | [
[],
[],
[],
[]
] | |
ekd0ab | Why high concentration of smoke makes sky red? | askscience | https://www.reddit.com/r/askscience/comments/ekd0ab/why_high_concentration_of_smoke_makes_sky_red/ | {
"a_id": [
"fdbse45"
],
"score": [
18
],
"text": [
"Waves cannot generally be blocked by objects that are much smaller that their wavelength. For example, if you put a speaker behind a garbage can, the garbage can will effectively block the treble (short wavelength), but the deep bass (long wavel... | [] | [] | [
[]
] | ||
c77zhn | what is generally the cause of death of bugs that only live a few days? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/c77zhn/eli5_what_is_generally_the_cause_of_death_of_bugs/ | {
"a_id": [
"esdobj6",
"esdpbal"
],
"score": [
5,
40
],
"text": [
"Usually its just the adult phase that only lasts for a few days. Theyve evolved a tradeoff of digestive system (or even a mouth) for reproductive organs/anatomy.\n\nThe nymphal stages allow for a long and fulfilling life",
... | [] | [] | [
[],
[]
] | ||
1khtjz | Why did the U.S. Military switch from geographic units (20th Maine Regiment) to more standard formation (10th Mountain Division) | If I remember correctly there was a shift from an all-volunteer army to a standing army of regulars. Was it just a matter or organizing units into greater specialization? One could think of reasons where putting men from a similar geography into a unit could be advantageous for morale. | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1khtjz/why_did_the_us_military_switch_from_geographic/ | {
"a_id": [
"cbp3w4z",
"cbp4id8"
],
"score": [
4,
4
],
"text": [
" > One could think of reasons where putting men from a similar geography into a unit could be advantageous for morale.\n\n The British have always gone in for regiments that recruited in one particular area. In WW1 they wen... | [] | [] | [
[
"http://en.wikipedia.org/wiki/Pals_battalions"
],
[]
] | |
7bxmw1 | why supersonic planes are designed with deltawings, and subsonic planes are designed with swept wings? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/7bxmw1/eli5_why_supersonic_planes_are_designed_with/ | {
"a_id": [
"dplnj35",
"dpm4f5i"
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"score": [
7,
2
],
"text": [
"Long skinny wings have [less drag](_URL_1_) for the amount of lift they generate, so they're more fuel efficient. But you can't have a long skinny wing on a supersonic airplane: if the wings stick outside the [cone-shaped s... | [] | [] | [
[
"https://physics.info/shock/",
"https://en.wikipedia.org/wiki/Lift-to-drag_ratio"
],
[]
] | ||
925rnr | Did the Allies during WWI ever consider naval landings in Germany? | It seems logical that the Allies would try large scale naval landings in northwestern Germany to avoid the defensive lines of the Western Front, but no such landings ever occurred. Was this due to a fear of naval landings going poorly like Gallipoli? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/925rnr/did_the_allies_during_wwi_ever_consider_naval/ | {
"a_id": [
"e339pfo"
],
"score": [
8
],
"text": [
"I have answered similar questions before [here](_URL_2_), [here](_URL_1_) and [here](_URL_0_). "
]
} | [] | [] | [
[
"https://www.reddit.com/r/WarCollege/comments/4hz4l4/bacons_folly_the_cancelled_1917_great_landing_in/",
"https://www.reddit.com/r/AskHistorians/comments/7se8ot/i_was_listening_to_the_podcast_on_the_battle_of/",
"https://www.reddit.com/r/AskHistorians/comments/45l3ap/was_landing_soldiers_behind_enemy_... | |
4y7cs7 | how do humans get electrocuted/pull power through their bodies when they aren't completing a circuit? | I've been learning about circuits and playing with power and I really don't understand how without holding power and ground of a dc circuit how can you get electrocuted, as it's difficult to complete the loop? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4y7cs7/eli5_how_do_humans_get_electrocutedpull_power/ | {
"a_id": [
"d6ljwss"
],
"score": [
2
],
"text": [
" > how without holding power and ground of a dc circuit\n\nThe term \"ground\" is not just a quaint name for a terminal connection; the physical ground of the planet is \"ground\" for a circuit to complete. If someone grabs a conductor with elec... | [] | [] | [
[]
] | |
d2dj5f | Was there a real rivalry between the Templars, Hospitallers and Teutonic knights like is frequently shown? | Especially the Hospitallers and Templar's seem to have a real rivalry in pop culture and books I read, but how much of it is accurate? They're all dedicated to the same mission for the most part, but I guess there would be competition for sponsors and donors. | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/d2dj5f/was_there_a_real_rivalry_between_the_templars/ | {
"a_id": [
"ezu7l6f"
],
"score": [
6
],
"text": [
"Whilst there's always more to be said this [answer](_URL_0_) by /u/Rhodis might be interesting"
]
} | [] | [] | [
[
"https://www.reddit.com/r/AskHistorians/comments/59hond/how_did_the_different_knight_orders_ie/d99rgld/"
]
] | |
3xk9ea | Is it true the UN let the Srebrenica Massacre occur? | I saw a video about Bosnian Muslims attacking the Serbian prime minister at the 20th anniversary of the Srebrenica massacre and in the video it said the UN let the Serb forces advance without putting up a fight, Allowing it to happen, how true is this? Did the US/UK/Dutch forces plan this? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/3xk9ea/is_it_true_the_un_let_the_srebrenica_massacre/ | {
"a_id": [
"cy5e43x",
"cy5fs21"
],
"score": [
32,
14
],
"text": [
"Hiya!\n\nThe UN absolutely did not 'let' the Srebrenica genocide occur in terms of 'intending to or allowing' the fall of the town and subsequent genocidal killings undertaken by Republika Srpska. The UN has, however, been... | [] | [] | [
[
"http://www.internationalpeaceandconflict.org/profiles/blogs/niod-report-on-srebrenica#.VnaILPl9671",
"http://www.un.org/en/ga/search/view_doc.asp?symbol=A/54/549"
],
[]
] | |
1wyfqd | how to play and win at eve online | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1wyfqd/eli5_how_to_play_and_win_at_eve_online/ | {
"a_id": [
"cf6iaeu"
],
"score": [
2
],
"text": [
"It's somewhere between having a full-time job and an alternate life. You have political alliances, hierarchies of power, very long-term planning, a complex economy, and more. It's a tremendous time sink."
]
} | [] | [] | [
[]
] | ||
8hbzqi | how do thoae scammy top-down games make any money | I'm talking about those games that trick stupid straight guys with lots of anime breasts and claims that you can "raise your own dragon" but is actually just a really bad remake of Age of Empires \- how do they make any profit?
Like surely whatever they earn pushing paywall purchases must be negated by how much they ... | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/8hbzqi/eli5_how_do_thoae_scammy_topdown_games_make_any/ | {
"a_id": [
"dyisw0z"
],
"score": [
5
],
"text": [
"Cracked had an interesting article about this topic awhile back. It’s a comedy site, but the article is pretty well-sourced with hyperlinks.\n\n_URL_0_"
]
} | [] | [] | [
[
"http://www.cracked.com/article_18461_5-creepy-ways-video-games-are-trying-to-get-you-addicted.html"
]
] | |
5q98k1 | Can a black hole lose enough mass to be visible? | Considering the effects of Hawking radiation, it is known that black holes slowly lose mass as they take in negative energy from nearby virtual particles and it is possible that they will eventually evaporate completely given enough time.
Would it be possible, at least in principle, for a black hole to lose enough mas... | askscience | https://www.reddit.com/r/askscience/comments/5q98k1/can_a_black_hole_lose_enough_mass_to_be_visible/ | {
"a_id": [
"dcxf2ut",
"dcxfiuo",
"dcxs5ob"
],
"score": [
3,
6,
2
],
"text": [
"Black holes in classical and semiclassical gravity always have horizons shrouding the interior. The interior is **never** exposed. When the black hole evaporates, the horizon just gets smaller. But noth... | [] | [] | [
[],
[],
[]
] | |
t7mvh | What would happen to someone if they were stabbed by a 1-atom thick sword made out of an indestructible material? | askscience | http://www.reddit.com/r/askscience/comments/t7mvh/what_would_happen_to_someone_if_they_were_stabbed/ | {
"a_id": [
"c4k8xpm",
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"c4kbbim",
"c4kbgvb"
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"score": [
23,
12,
3,
3,
2
],
"text": [
"With a very quick google search I have found that this same question has been asked and answered. \n_URL_0_",
"On an atomic level, your body is mostly e... | [] | [] | [
[
"http://www.reddit.com/r/askscience/comments/neqy4/hypothetically_if_you_had_a_sword_1_atom_thick/"
],
[],
[],
[],
[]
] | ||
bci5wa | Hi all history buffs. So I'm a HUGE fan of the 1920. Especially Jazz, Cinema and the prohibition. But recently I've been fascinated with daily life in that decade. Any resources or anything to learn more? I've watched Ken Burns Prohibition documentary many times | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/bci5wa/hi_all_history_buffs_so_im_a_huge_fan_of_the_1920/ | {
"a_id": [
"ekqykqi"
],
"score": [
4
],
"text": [
"I highly recommend Frederick Lewis Allen's 1931 classic [Only Yesterday](_URL_1_). It reminds me of the decade retrospectives (1960s, 70s, etc,) that CNN has - but Lewis wrote his classic long before CNN. Even by 1931 - in the wake of the Crash a... | [] | [] | [
[
"https://www.amazon.com/gp/product/1849022496/ref=dbs_a_def_rwt_hsch_vapi_taft_p1_i3",
"https://www.amazon.com/Only-Yesterday-Informal-Perennial-Classics/dp/0060956658"
]
] | ||
7gwmzl | Are there different types of electrons? | According to the standard model, each particle is an oscillation in a quantum field. There are different energies of photons. Similarly, can an excitation of the electron field have different levels?
I know that electrons have different energy levels in an atom, is this a separate concept from the one I described abov... | askscience | https://www.reddit.com/r/askscience/comments/7gwmzl/are_there_different_types_of_electrons/ | {
"a_id": [
"dqmgarl",
"dqnm8vp"
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"score": [
25,
3
],
"text": [
"That is a separate concept. Every electron is fundamentally identical to every other electron, and same for photons.\n\nEach of these particles can have whatever energies you want (although an electron can never have an ene... | [] | [] | [
[],
[]
] | |
2ceet2 | what is "engine breaking" and why isn't it permitted? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2ceet2/eli5_what_is_engine_breaking_and_why_isnt_it/ | {
"a_id": [
"cjencyt",
"cjepo8k"
],
"score": [
7,
2
],
"text": [
"Engine braking is used to slow the vehicle by creating back pressure at the exhaust manifold. (The hot gas can't get out quickly - slowing the engine) Thus, braking via the pedal is reduced, prolonging brake life and keeping... | [] | [] | [
[],
[
"http://en.wikipedia.org/wiki/Compression_release_engine_brake"
]
] | ||
6mmeob | what is a 'gig economy', how does it work, and why is it becoming increasingly popular? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/6mmeob/eli5_what_is_a_gig_economy_how_does_it_work_and/ | {
"a_id": [
"dk2ma7x"
],
"score": [
19
],
"text": [
"The \"gig economy\" is where, instead of having a steady job you go to for 40 hours and week and a stable income from that job, you make money by doing various things on irregular, self-set hours. Some examples might be driving for Uber, doing T... | [] | [] | [
[]
] | ||
4cnhvk | Do neurons have their own genome? | My AP Biology always said that all the cells in a your body have the same DNA but a few articles on the internet like this one ( _URL_0_ ) say that neurons often have different ones and even unique to a specific neuron. So who is right? | askscience | https://www.reddit.com/r/askscience/comments/4cnhvk/do_neurons_have_their_own_genome/ | {
"a_id": [
"d1k1hya",
"d1k1p8c"
],
"score": [
4,
9
],
"text": [
"To be clear, most cells do not in fact contain the exact same DNA pattern. One simple reason: mutations. All DNA will undergo natural mutations. This article is saying that neurons have a high rate of mutations. So yes, thei... | [] | [
"https://www.sciencenews.org/article/brain-cells%E2%80%99-dna-differs"
] | [
[
"http://www.nature.com/scitable/topicpage/genetic-mutation-441",
"http://www.pbs.org/wgbh/nova/body/epigenetics.html"
],
[
"http://sandwalk.blogspot.com/2013/03/estimating-human-human-mutatin-rate.html"
]
] | |
1yubqn | When and where did pie throwing as a form on entertainment originate? | A pie being thrown into someone's face is a classic gag, but I am wondering where it got its origins? I assume it came about during the vaudeville era, but I still wonder how it came about. Thanks! | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1yubqn/when_and_where_did_pie_throwing_as_a_form_on/ | {
"a_id": [
"cfob95q"
],
"score": [
2
],
"text": [
"This reminds me of a [question](_URL_5_) that was asked some time ago, and was one of my favorite I've seen on this sub. We never answered it perfectly, but there was [a Google answer](_URL_2_) that did a decent job. \n\nLuckily, it seems your q... | [] | [] | [
[
"http://en.wikipedia.org/wiki/Ben_Turpin",
"http://www.youtube.com/watch?v=WcJaN9n3W6Q",
"http://answers.google.com/answers/threadview?id=217280",
"http://www.youtube.com/watch?v=XrtKhhYxEKQ",
"http://books.google.com/books?id=oyLQn5zMtWMC&pg=PA124&lpg=PA124&dq=doc+kelley+pie+in+th... | |
1qalil | how does south park use strikingly similar product logos in episodes? | Wouldn't the companies claim they are too close to the real design and sue? Does South Park have some special circumstances? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1qalil/eli5_how_does_south_park_use_strikingly_similar/ | {
"a_id": [
"cdavd51",
"cdavwab"
],
"score": [
4,
2
],
"text": [
"Protected by parody laws. You're allowed to make fun of things. They would also be protected if they used the real logos because then they're be protected because those logos actually exist and they're not pretending that ... | [] | [] | [
[],
[]
] | |
6oh7py | what's the noise that trucks make when they stop, like air is being expelled? | I've always wondered. Sometimes it's just before they start moving again. | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/6oh7py/eli5_whats_the_noise_that_trucks_make_when_they/ | {
"a_id": [
"dkhael4",
"dkhaemt"
],
"score": [
3,
9
],
"text": [
"It is actually air being expelled.\n\nLarger vehicles use air brakes. They compress air and use that to work the brakes rather than (entirely) counting on hydraulics like smaller vehicles. The advantage to air brakes is th... | [] | [] | [
[],
[]
] |
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