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 |
|---|---|---|---|---|---|---|---|---|---|
65m752 | what's the point of stove range hoods that don't vent outside? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/65m752/eli5_whats_the_point_of_stove_range_hoods_that/ | {
"a_id": [
"dgbcxsy"
],
"score": [
6
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"text": [
"They contain a filter that removes the worst of the smoke so you don't end up getting a stained ceiling when you cook. Also, they use a fan that slightly spreads out the hot air they collect, reducing the chance of scorching your cabinets."
]
} | [] | [] | [
[]
] | ||
22sqf5 | if much of the matter in the universe exists outside the visible spectrum, how come i don't bump into objects all the time that i simply can't see? | In all of my experiences, the only objects that I have ever seen was matter that emitted or reflected light in the visible range. However, a significant amount of the matter in the universe is only detectable by their emitted or reflected UV, infrared, x-ray, etc. radiation. Therefore, would it be possible for me to bu... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/22sqf5/eli5_if_much_of_the_matter_in_the_universe_exists/ | {
"a_id": [
"cgpzwhr",
"cgq06ty"
],
"score": [
7,
3
],
"text": [
"There's not a whole lot out there that is *only* visible in UV/IR/non-visible/etc wavelengths. Most matter, especially solids, is visible in the visible spectrum. It's largely gases that are fully invisible in the visible sp... | [] | [] | [
[],
[]
] | |
64slfk | why do people think that killing someone with chemicals is sp much worse than other ways of killing | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/64slfk/eli5_why_do_people_think_that_killing_someone/ | {
"a_id": [
"dg4ogle",
"dg4ojmt"
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"score": [
2,
2
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"text": [
"The problem with chemical weapons is that they kill indescriminately. Chemical gases are random and uncontrollable by default, so its inherently more dangerous and irresponsible than most other weapons. The issue isn't so mu... | [] | [] | [
[],
[]
] | ||
2tprhu | why do dogs love sticks? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2tprhu/eli5_why_do_dogs_love_sticks/ | {
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"http://www.reddit.com/r/explainlikeimfive/comments/218b1v/eli5_why_does_my_dog_pick_up_sticks_in_her_mouth/cgalxv8"
],
[],
[],
[],
[],
[],
[],
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... | ||
8eb9n7 | Why does gold have a higher density than lead while it has a lower molecular mass? | Is it because of the metal structure or because of the electrons around the atom being in different positions? Or something I am not thinking of at all? | askscience | https://www.reddit.com/r/askscience/comments/8eb9n7/why_does_gold_have_a_higher_density_than_lead/ | {
"a_id": [
"dxvtgeb",
"dxw5rxg"
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"score": [
3,
2
],
"text": [
"Atomic mass only has a very loose relationship with density:\n\n_URL_0_\n\nWhat's far more important is the electronic interactions it has with other atoms of the same type. The nature of those interactions, their strength,... | [] | [] | [
[
"https://i.stack.imgur.com/6iOi9.gif"
],
[]
] | |
b1xzy1 | what is synthetic identity theft, how does it differ from "ghosting" and identity theft and why isn't it as widely publicized as identity theft? | **Disclaimer**: This is not a question about endorsement of illegal activity or how to carry out criminal activity. It is simply an ELI5, as I have searched and no results for this topic. | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/b1xzy1/eli5_what_is_synthetic_identity_theft_how_does_it/ | {
"a_id": [
"eiozpki"
],
"score": [
3
],
"text": [
"In traditional identity theft, I figure out your details and impersonate you. By doing this, I might entice some bank to give me money, based on your good credit score. My risk is that you might detect me and email the bank \"Hey, this isn't me... | [] | [] | [
[]
] | |
4thm0m | do sperms come with pre-installed intelligence and character or are all sperms the same and develop these traits later? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4thm0m/eli5_do_sperms_come_with_preinstalled/ | {
"a_id": [
"d5hfc6c"
],
"score": [
3
],
"text": [
"I like to compare intelligence to a glass of water. You can think of the size of the glass as your genetic contribution (the instructions encoded within sperm and egg cells) and the water itself as your environment. The size of your glass determi... | [] | [] | [
[
"http://www.nature.com/mp/journal/v19/n2/abs/mp2012184a.html"
]
] | ||
715ksa | why can bands use child nudity on their cover art, and not get slammed with a "child pornography" label? | It just struck me when I was listening to Pandora, that there are artists that use naked pictures of children on their albums. How can they get away with this when they're distributing this all over the world for a price, and it's technically child pornography is it not?
& nbsp;
Some that I can think of off th... | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/715ksa/eli5_why_can_bands_use_child_nudity_on_their/ | {
"a_id": [
"dn891z6",
"dn8954k",
"dn895cz"
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"score": [
6,
8,
10
],
"text": [
"In the same way that you can have a naked person in a statue or painting and have it be art and not pornography, you can have a naked picture of a child without it being pornography. Tons of parents ha... | [] | [] | [
[],
[],
[]
] | |
37nh5y | When I'm driving up a hill and look at the pavement, what is it that I'm seeing as the plane of the pavement is parallel to my vision? | So I recently moved to an area where there's tons of hills. As I'm driving everyday, I encounter the above phenomenon. The image on the pavement itself is like a distorted reflection of the environment beyond it (like 100 ft after). I realized this when I saw the color orange being reflected off of a Uhaul truck. The e... | askscience | http://www.reddit.com/r/askscience/comments/37nh5y/when_im_driving_up_a_hill_and_look_at_the/ | {
"a_id": [
"cro7rye",
"crogi9q"
],
"score": [
23,
13
],
"text": [
"This only happens with hot pavement, actually! It's a result of refraction: light being bent when traveling through different mediums of different densities. Similar to what happens when you look at a straw in a glass of w... | [] | [] | [
[
"http://m.mentalfloss.com/article.php?id=52514"
],
[]
] | |
8anixh | Would honey bees be considered an invasive species to North and South America? | askscience | https://www.reddit.com/r/askscience/comments/8anixh/would_honey_bees_be_considered_an_invasive/ | {
"a_id": [
"dx02hlq"
],
"score": [
8
],
"text": [
"*Apis mellifera*, the major honey bee, is not native to the Americas, but Native Americans kept native species prior to the introduction of *mellifera*. \n\nEdit: Checked back and noticed my source wasn't good. Replaced it with some better ones.\... | [] | [] | [
[
"https://news.ncsu.edu/2016/06/squash-agriculture-bees-2016/",
"https://deepblue.lib.umich.edu/bitstream/handle/2027.42/96996/UMURJ-Issue07_2010-DMImre.pdf?sequence=1"
]
] | ||
19yrkd | If everyone on a commercial airliner were to jump and land at the same time, would it changed the trajectory of the aircraft? | I'm trying to think of this in the context of Newtons 3rd law. Would the reaction of the air under the plane and above the passengers' heads equal the force of the jump and land? | askscience | http://www.reddit.com/r/askscience/comments/19yrkd/if_everyone_on_a_commercial_airliner_were_to_jump/ | {
"a_id": [
"c8sjj3f"
],
"score": [
8
],
"text": [
"Pilot here. Aircraft are designed to handle multiple times the force of gravity, both in positive and negative G's. Another post here has math that states that the weight of the aircraft would effectively double for a very small amount of time, d... | [] | [] | [
[]
] | |
2pxdf2 | Is it possible for stars to have the same kinds of rings Saturn has? If our Sun had those kind of rings would they cast a shadow on Earth and all the other planets? | askscience | http://www.reddit.com/r/askscience/comments/2pxdf2/is_it_possible_for_stars_to_have_the_same_kinds/ | {
"a_id": [
"cn1csc0",
"cn1l7g9"
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"score": [
3,
2
],
"text": [
"Probably not, at least not for any extended period of time. The Saturn rings are inside the Roche limit. Basically the point where tidal forces rip large objects apart.\n\n_URL_1_\n\nFor the Sun, this is around a million k... | [] | [] | [
[
"http://en.wikipedia.org/wiki/Yarkovsky%E2%80%93O%27Keefe%E2%80%93Radzievskii%E2%80%93Paddack_effect",
"http://en.wikipedia.org/wiki/Roche_limit",
"http://en.wikipedia.org/wiki/Yarkovsky_effect",
"http://en.wikipedia.org/wiki/Poynting%E2%80%93Robertson_effect"
],
[
"http://en.wikipedia.org... | ||
5d5y76 | Does water boil off speed change depending on the pot size? | If you have a gallon of water at a rolling boil for an hour, will you boil off more liquid in a 24-inch diameter pot than in an 8-inch diameter pot? Or will there be no volume difference? | askscience | https://www.reddit.com/r/askscience/comments/5d5y76/does_water_boil_off_speed_change_depending_on_the/ | {
"a_id": [
"da2i2li",
"da2lwe9"
],
"score": [
3,
3
],
"text": [
"Yes.\n\nIn a nutshell, \"boiling off\" is liquid turning into gas, in this case, water into steam. By having a larger surface area, you are allowing more water molecules to evaporate into joining the air simultaneously, so a... | [] | [] | [
[
"https://commons.wikimedia.org/wiki/File:Marakkanam_Salt_Pans.JPG"
],
[]
] | |
6byj5n | How does "polishing out" scratches work on a molecular level? | Hey today I read an article that said that you can try to polish out small scratches in gold. As gold is quite soft that makes at least some sense however I wondered how that works on a molecular level (u can be precise I am a physicist myself). It also stated that it is somewhat even possible with glas, does anyone kn... | askscience | https://www.reddit.com/r/askscience/comments/6byj5n/how_does_polishing_out_scratches_work_on_a/ | {
"a_id": [
"dhqn3l3"
],
"score": [
18
],
"text": [
"\"Polishing\" is a process of removing molecules from the surface until the scratches are less noticeable. Most methods involve abrasive compounds (like the \"sand\" on sandpaper, or in the paste in buffing compound). Sometimes it's a several-st... | [] | [] | [
[]
] | |
87fxsa | Are there any resources that Earth has already run out of? | We're always hearing that certain resources are going to be used up someday (oil, helium, lithium...) But is there anything that the Earth has *already* run out of? | askscience | https://www.reddit.com/r/askscience/comments/87fxsa/are_there_any_resources_that_earth_has_already/ | {
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"d... | [] | [] | [
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"https://en.wikipedia.org/wiki/Easter_Island"
],
[],
[
"https://en.m.wikipedia.org/wiki/Cryolite"
],
[],
[
"https://en.wikipedia.org/wiki/Lignum_vitae",
"https://en.wikipedia.org/wiki/Cryolite",
"https://en.wikipedia.org/wiki/Silphium",
"https://en.wikipedia.org/wiki/Ivittuut"
... | |
60bixq | how do they put sponsors under the ice rink? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/60bixq/eli5how_do_they_put_sponsors_under_the_ice_rink/ | {
"a_id": [
"df4zc8u",
"df52dqv"
],
"score": [
8,
5
],
"text": [
"It's just painted or adhered to the floor beneath, and then water is frozen on top to make the ice surface. ",
"A german show for curious kids (\"Die Sendung mit der Maus\") has a nice time lapse of how it happens: _URL_... | [] | [] | [
[],
[
"http://www.ardmediathek.de/tv/Die-Sendung-mit-der-Maus/Sachgeschichte-Eisstadion-Zeitraffer/WDR-Fernsehen/Video?bcastId=22380500&documentId=31634448",
"https://www.youtube.com/watch?v=aCHtdxRC7gc"
]
] | ||
g2czh9 | If tree leaves have chlorophyll in them, why are some leaves coloured red or yellow? | askscience | https://www.reddit.com/r/askscience/comments/g2czh9/if_tree_leaves_have_chlorophyll_in_them_why_are/ | {
"a_id": [
"fnqljyu"
],
"score": [
2
],
"text": [
"Because chlorophyl is not the only component. Almost all trees have other phytochemicals present, e.g. carotenoids. These are i.a. meant to protect the cells from radiation. The leaves need light to work, but too much light is also dangerous. Tha... | [] | [] | [
[]
] | ||
h4fk2 | Scenario: Assuming no loss of knowledge, how long would it take humanity to recover from being bombed back to the stone age? | To expand on the question: If we suddenly lost all of our manufacturing ability and technology (massive global EMP / nanotech grey goo / Cthulhu), how long would it take us to get back to 21^st Century levels of metallurgy, electronics, material sciences, etc.? If all we're left with is the knowledge in our heads, ho... | askscience | http://www.reddit.com/r/askscience/comments/h4fk2/scenario_assuming_no_loss_of_knowledge_how_long/ | {
"a_id": [
"c1shza4",
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],
"score": [
3,
3
],
"text": [
"It would be less than ten years. Japan and Germany were left in only slightly better shape than nothing after WWII and they snapped back remarkably well after ~10 years or so, 20 years later they were fully industrialized ... | [] | [] | [
[],
[]
] | |
1umx6r | what nvidias g-sync and amds freesync is | Allright, so i get that it stands for GPU synchronisation, and that it syncs your GPU with your monitor in some way. ANd that NVidias has some sort of chip inside of the monitor, whilst AMDs is free.
But, i have no clue what it actually does, i've seen a video where 2 laptops renders the same scene, one with freesync,... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1umx6r/eli5what_nvidias_gsync_and_amds_freesync_is/ | {
"a_id": [
"cejoohy"
],
"score": [
2
],
"text": [
"With old CRT's, the monitor had to scan a beam of electrons across the screen to light up each pixel. It could only target one pixel at a time, and did them all in order in a repeating pattern. And each pixel that was lit up had to be constantly ... | [] | [] | [
[]
] | |
5toffo | why are horizontal and vertical speeds independent of each other? | Working on physics homework and read that if you roll a ball off a table, it's speed doesn't effect the time it takes for the ball to hit the floor. So, horizontal and vertical speeds are independent of each other. This doesn't make sense to me. Hoping someone can explain it in a way that helps me understand. | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/5toffo/eli5_why_are_horizontal_and_vertical_speeds/ | {
"a_id": [
"ddnuwuw",
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"score": [
3,
4
],
"text": [
"An easier way to think of this is: what should the connection be?\n\nDo you agree that blue ball and a red ball should fall at the same speed?\n\nOkay, then do you agree that a happy jumping person and a sad jumping person s... | [] | [] | [
[],
[]
] | |
2xg8cu | Did Nazi Germany have anti-association laws? | As in it was illegal to associate with Jews, etc. If not, are there any other examples of anti-association laws post 1800? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/2xg8cu/did_nazi_germany_have_antiassociation_laws/ | {
"a_id": [
"cozvtdq"
],
"score": [
5
],
"text": [
"I'm not crazy about looking to Nazi law as a source of how the government worked. \n\nInsofar as there were such laws under the Third Reich, they were generally subordinated to the Führerprinzip, meaning that absolute subordination to the will of... | [] | [] | [
[]
] | |
1xznw9 | the unspoken rules and social conventions in england. | Thinking about moving to England in a few years. I wouldn't want to be perceived as rude or a tourist. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1xznw9/eli5_the_unspoken_rules_and_social_conventions_in/ | {
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"score": [
2,
5,
2,
3,
6
],
"text": [
"It is significantly more difficult to answer this question without knowing where you are from. ",
"For love of Queen and Country, do not dare jump the que... | [] | [] | [
[],
[],
[],
[],
[
"http://www.youtube.com/watch?v=W2KCO0OKfrI"
]
] | |
23t3pf | how do people get max high scores on mobile games? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/23t3pf/eli5how_do_people_get_max_high_scores_on_mobile/ | {
"a_id": [
"ch0bdja"
],
"score": [
3
],
"text": [
"They cheat. Very few, if any, top scores on any game are legitimate. "
]
} | [] | [] | [
[]
] | ||
370tuo | why is nobody making a a huge deal about the helium shortage in mainstream media? | Even more so, why is it still legal for helium to be wasted on stuff like party balloons? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/370tuo/eli5_why_is_nobody_making_a_a_huge_deal_about_the/ | {
"a_id": [
"cripgkk",
"criplpq"
],
"score": [
3,
8
],
"text": [
"The media made the sensationalist stuff up in the first place. We're not running out of helium, we're just [running out of cheap helium.](_URL_0_)",
"Because it's not a huge deal. There is no helium shortage. There is mo... | [] | [] | [
[
"http://zidbits.com/2011/08/are-we-really-running-out-of-helium/"
],
[]
] | |
82t7tv | is there a physiological or psychological reason why people look up when they're exasperated or frustrated? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/82t7tv/eli5_is_there_a_physiological_or_psychological/ | {
"a_id": [
"dvcr901"
],
"score": [
8
],
"text": [
"This is something called \"eye blocking\". When someone perceives something they don't like they avert or cover their eyes, even if the thing they don't like isn't something they've seen. This happens in blind children, so it's apparently hard ... | [] | [] | [
[]
] | ||
a3v240 | how does the zero-gravity life affect one's respiratory, digestive, and nervous system over time? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/a3v240/eli5_how_does_the_zerogravity_life_affect_ones/ | {
"a_id": [
"eb9ldtd"
],
"score": [
3
],
"text": [
"It doesn't seem to cause respiration system changes at all. It completely messes up the other two though, resulting in changes in structure and position of the various parts of your brain and digestive system. These arent necessarily dangerous fo... | [] | [] | [
[]
] | ||
1p03vt | earlier today i tripped and scraped my knee. the skin broke and bled but my tights remained intact. how does this happen? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1p03vt/eli5_earlier_today_i_tripped_and_scraped_my_knee/ | {
"a_id": [
"ccxd70x",
"ccxd79x"
],
"score": [
6,
4
],
"text": [
"The surface you impacted wasn't responsible for puncturing your leg. The force/friction was likely transferred through your tights, to your leg.",
"Tights aren't firmly attached to your body, so they can slip, but when s... | [] | [] | [
[],
[]
] | ||
4eh64c | how powerful are us states? | I'm doing some studying around, how much power US states have compared to the federal government and I'd love it explained simply. | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4eh64c/eli5how_powerful_are_us_states/ | {
"a_id": [
"d2023a7",
"d202cnb"
],
"score": [
6,
2
],
"text": [
"If the federal government is not given a power in the constitution, then the states get to rule on it. If the federal government is given a power, then their rules trump whatever the states say. This is explicitly stated in ... | [] | [] | [
[
"https://en.wikipedia.org/wiki/Article_One_of_the_United_States_Constitution#Section_8:_Powers_of_Congress",
"https://en.wikipedia.org/wiki/Commerce_Clause",
"https://en.wikipedia.org/wiki/Tenth_Amendment_to_the_United_States_Constitution"
],
[]
] | |
2sl480 | the point of "flat-billed" hats and leaving the stickers on them | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2sl480/eli5_the_point_of_flatbilled_hats_and_leaving_the/ | {
"a_id": [
"cnqhjqo"
],
"score": [
15
],
"text": [
"When you're poor and ashamed of being poor, trying to look like you aren't poor can seem really important to you. Some poor people decided to keep their hat brims unbent, and left the sticker on. This was to prove that they bought the hat new, r... | [] | [] | [
[]
] | ||
1i6eau | the ability to be vague in the "ingredients" list on certain foods | I can't think of exact specifics, but we've seen them. Sometimes they say things like *"assorted spices"*. Sometimes on tiny packages they'll even have things like *"and other ingredients*". Sometimes they won't expand on a subset and other times they will *"complex ingredient (complex ingredient's subingredients)"*
I... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1i6eau/eli5_the_ability_to_be_vague_in_the_ingredients/ | {
"a_id": [
"cb1fd0n"
],
"score": [
3
],
"text": [
"The FDA has very specific rules on labeling, as can be found [here](_URL_0_)\n\nThe rules specifically address 'spices' and indicate they can be listed very generically, as \"spices\" or variations thereof. \n\nAs for why they did it that way, on... | [] | [] | [
[
"http://www.fda.gov/Food/GuidanceRegulation/GuidanceDocumentsRegulatoryInformation/LabelingNutrition/ucm064880.htm"
]
] | |
230x2k | the "helicopter" sound when rear windows are rolled down. | You know when your driving down the highway or whatever, and you have the front windows down a bit, or even shut, and you roll down the backseat windows, we get that annoying noise, that kind of sounds like a helicopter. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/230x2k/eli5_the_helicopter_sound_when_rear_windows_are/ | {
"a_id": [
"cgsawqu",
"cgsb6xe",
"cgsbdec"
],
"score": [
8,
4,
3
],
"text": [
"Thank Christ you hear it too!!! Everyone I ever drive with says they don't hear it!",
"It's turbulent air coming in the windows and hitting other air (or the back of the car, this happens in some ca... | [] | [] | [
[],
[],
[]
] | |
5laoxs | Changes in photographic technology/techniques around the late '70s/early '80s? | In another thread, someone posted a link to [this website](_URL_0_) which shows terrible food photography from the '60s and '70s. The thread itself was about the food, but I was wondering about the photography, and a mod suggested I ask in a fresh post.
I'm not a photographer, so I can't explain it clearly, but it se... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/5laoxs/changes_in_photographic_technologytechniques/ | {
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"I'm coming around to this post really late but I've often wondered about this myself. I'm not a historian but in a 3-day old thread I don't think it matters. I am pretty knowledgeable about photography and painting as fields of fine art. \n\nWhat... | [] | [
"http://www.lileks.com/institute/gallery/"
] | [
[
"http://imgur.com/pSFFian"
]
] | |
qa8wn | what's the deal with the district of columbia? | I know it's not a state. It gets electors in the Electoral College but no vote in Congress. Why is this? What holds this city-state-thing together? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/qa8wn/eli5_whats_the_deal_with_the_district_of_columbia/ | {
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"text": [
"\"The land of the law makers shouldn't be subject to a state's laws\". A byproduct of this is that the citizens of such area have little representation, you could call the entire d... | [] | [] | [
[],
[],
[],
[]
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49djm0 | where does the first person each season catch the flu from? | I know the flu is seasonal (influenza flu) - but it HAS to start somewhere each season. Where does that unlucky person catch it? As I understand it, the virus doesn't live too long outside of a human.
| explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/49djm0/eli5_where_does_the_first_person_each_season/ | {
"a_id": [
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"score": [
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"text": [
"The flu is always going around. During the summer months, if someone with the flu sneezes outside, the flu virus sprays out from their nose and mouth, and then floats down to the grass where it doesn't get transferred to a... | [] | [] | [
[],
[]
] | |
1mybfx | in classical times were camp followers usually natives of the army's homeland who'd followed them into enemy territory, or were they usually natives of the invaded land who weren’t too scrupulous about who they dealt with? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1mybfx/in_classical_times_were_camp_followers_usually/ | {
"a_id": [
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"score": [
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"text": [
"This question is a bit vague. \n\nIt sounds like you may have some specific military campaigns in mind. Could you provide some examples?"
]
} | [] | [] | [
[]
] | ||
17m8m4 | how does the tsa continue to function despite the 4th amendment? | The fourth amendment protects from unreasonable search and seizure and yet the TSA can take your liquids if they're not clear and are larger than a certain size, can pat you down, you have to go through the body scanners, etc. How are these not considered a violation of the 4th amendment?
Note: I'm not necessarily aga... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/17m8m4/how_does_the_tsa_continue_to_function_despite_the/ | {
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"text": [
"Nothing the TSA does is an unreasonable search or seizure, for a huge variety of reasons.\n\nFirst and foremost, nobody's required to travel by air. Going to the airport and pass... | [] | [] | [
[],
[],
[],
[]
] | |
3zk09c | How important was casus beli in the medieval world? | I play a game called crusader kings 2. In the game, one cannot declare war on other rulers without a proper casus beli.
Was it so in the medieval world? Could I as a ruler declare war on someone just cause I can or would I always need to specify some reason howsoever flimsy? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/3zk09c/how_important_was_casus_beli_in_the_medieval_world/ | {
"a_id": [
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"text": [
"To add on to this. How many wars were actually \"declared\" back then? I was under the impression that most fighting was either raiding someone elses land or defending your own against raiders, and not necessarily the sort of wars we are used to... | [] | [] | [
[]
] | |
1b9nxd | Measuring an organism's sense of curiosity | I am curious about curiosity:
Is there a scale that scientists use to measure an organism's sense of curiosity? For example, is there some scale by which we can say that an octopus is more curious about its environment than, say, an ant?
If so, does curiosity strongly correlate to anything, such as number of neurons?... | askscience | http://www.reddit.com/r/askscience/comments/1b9nxd/measuring_an_organisms_sense_of_curiosity/ | {
"a_id": [
"c956ok3"
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"score": [
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"text": [
"This is sort-of addressed via measures of \"boldness\" or \"exploratory behavior\"\n\nBasically, you release the animal in a new environment (like an open room) or present it with some object it has never seen before. Then you measure the amount... | [] | [] | [
[]
] | |
4z4pls | Why did steppe peoples fall from prominence? | It seems as though from Antiquity up to the Early Modern Period steppe peoples would periodically invade China, Persia, India, and Europe. After the 15th century though, it seems like this came to a halt. While I was reading about this on wikipedia, it seemed like one factor might be the rise of "Gunpowder Empires" - t... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/4z4pls/why_did_steppe_peoples_fall_from_prominence/ | {
"a_id": [
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"score": [
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"text": [
"You're right that gunpowder played an important role in colonizing the steppe. Gunpowder allowed sedentary empires to field more men-at-arms because it required significantly less resources to arm and train an army equipped with gunpowder than an... | [] | [] | [
[
"https://en.wikipedia.org/wiki/Zasechnaya_cherta"
]
] | |
3aic6j | If after splitting Uranium, you get energy and two new smaller elements, then what does radioactive waste consist of? | Aren't those smaller elements not dangerous? | askscience | http://www.reddit.com/r/askscience/comments/3aic6j/if_after_splitting_uranium_you_get_energy_and_two/ | {
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"In many cases, the daughter elements of radioactive decays are also unstable, and the n... | [] | [] | [
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"http://whatisnuclear.com/articles/waste.html"
],
[],
[],
[
"https://en.wikipedia.org/wiki/Fission_product_yield"
],
[],
... | |
4433xb | if the earth can be used to ground charged objects, why is dirt not a good conductor? | And where do the electrons go, if dirt doesn't conduct electricity? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4433xb/eli5_if_the_earth_can_be_used_to_ground_charged/ | {
"a_id": [
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"score": [
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"text": [
"A one-inch cube of dirt will not conduct electricity very well. In technical terms, it has a high resistance. By comparison, a one-inch cube of iron, copper or gold will have a very low resistance.\n\nHowever, resistance do... | [] | [] | [
[],
[]
] | |
7jpogq | why is it not possible to have drugs like mdma in the body indefinitely so you can have good feelings and keep the serotonin levels high? | The effects lasts for hours but is it possible to feel euphoria permanently?
> Because the levels of this feel good chemical increase well beyond its normal threshold, when the drug leaves the body, the levels of serotonin plummet, often leaving the drug user in withdrawal.
_URL_0_ | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/7jpogq/eli5_why_is_it_not_possible_to_have_drugs_like/ | {
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"text": [
"Mdma triggers your brain to release all its serotonin at once, essentially. You only have a limited amount. When the effects of the drug wear off, your brain rubber bands and takes it all back in and then some, leaving you out of balance, in a p... | [] | [
"http://psychedelics.com/mdma/what-is-suicide-tuesday/"
] | [
[]
] | |
29klj5 | How do we know what ancient Carthage looked like? | I know that the Roman republic effectively wiped Carthage from history and that very little remains for us to study. So how is it that artists have drawn images like this?
_URL_0_
Is it all speculation or based on accounts? If so what accounts/sources should I read? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/29klj5/how_do_we_know_what_ancient_carthage_looked_like/ | {
"a_id": [
"ciluh3p"
],
"score": [
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"text": [
"We've got multiple ways, actually! While the city and most of the populace was wiped out, there's still a HUGE amount of [archaeological remnants](_URL_0_) that we can study - those remnants give us an idea as to what the homes looked like and t... | [] | [
"http://1.bp.blogspot.com/-y1p4fpX9F3Q/UPivyMrYIlI/AAAAAAAAN9Y/SiIiHdBtCN4/s1600/carthage.jpg"
] | [
[
"http://i.ytimg.com/vi/OABGDengovU/0.jpg",
"https://www.google.com/maps/place/Carthage+Dermech/@36.8450708,10.3220701,3431m/data=!3m1!1e3!4m2!3m1!1s0x12e2b4ca5ecad0c9:0xa188fee4709f1481",
"http://whc.unesco.org/uploads/thumbs/site_0037_0001-500-500-20100520160928.jpg",
"http://math.arizona.edu/~di... | |
um4ma | Is there any correlation between newborn weight loss and adult weight gain? | I guess my question is this: would an adult be more prone to weight gain if they experienced larger than normal (outside the suggested 7-10%) weight loss as a newborn? Would this excessive weight loss trigger some sort of nutritional hoarding instinct? | askscience | http://www.reddit.com/r/askscience/comments/um4ma/is_there_any_correlation_between_newborn_weight/ | {
"a_id": [
"c4wkv4m"
],
"score": [
4
],
"text": [
"The question that you're asking is related to the growth acceleration hypothesis. [This](_URL_0_) is a pretty good article on the subject.\n\nThe take-away message from the article is this:\n\"...For instance, faster weight gain (upward centile c... | [] | [] | [
[
"http://journals.lww.com/jpgn/Fulltext/2010/12003/Does_Weight_Gain_in_Infancy_Influence_the_Later.2.aspx"
]
] | |
598kb7 | Why isn't the Qing dynasty universally considered Chinese when they self identified as such (Dulimbai Gurun)? | For example the Tibetan Government in Exile as well as New Qing Historians downplays the Chinese-ness of the Qing. The current PRC government does not equate China with Han. Why is Chinese automatically equated with Han when both the Qing and PRC emphatically equated Chinese with ALL the peoples of Daicing Gurun/Zhongu... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/598kb7/why_isnt_the_qing_dynasty_universally_considered/ | {
"a_id": [
"d96jnzp"
],
"score": [
3
],
"text": [
"First of all I would say what the PRC government says and what actually is the case are completely different, particularly as they like to utilise race and *minzu* for political purposes. \n\nHistorically, Han chauvinism has been and continues to... | [] | [] | [
[]
] | |
326xuz | In physics books, why are amperes considered a fundamental unit while coulomb's are considered a derived trait? | I would think that coulomb's are more fundamental as they can be based on a certain number of electrons. Is this just a historical artifact? | askscience | http://www.reddit.com/r/askscience/comments/326xuz/in_physics_books_why_are_amperes_considered_a/ | {
"a_id": [
"cq8h3p6"
],
"score": [
9
],
"text": [
"This is discussed [here](_URL_0_)."
]
} | [] | [] | [
[
"http://physics.stackexchange.com/questions/70651/why-is-the-ampere-a-base-unit-and-not-the-coulomb"
]
] | |
9ymtbu | why does copyright last so long if companys dont make money from their old products anymore since they're most likely discontinued? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/9ymtbu/eli5_why_does_copyright_last_so_long_if_companys/ | {
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"text": [
"Because the companies that push to make copyrights last forever are the companies that continue to profit from their works from long ago. Why would Disney want Mickie Mouse to be public domain? ",
"... | [] | [] | [
[],
[],
[]
] | ||
1z1m1u | What is the purpose of a tiny resistor in an array of high powered LEDs? | The title is one of my few questions pertaining to setting up LED arrays, but here is my situation -
I am currently building some LED arrays so they can be plugged into a wall using an AC to DC power converter for convenience. Just for simplicity I am using 12v adapters with differing amperage depending on our array. ... | askscience | http://www.reddit.com/r/askscience/comments/1z1m1u/what_is_the_purpose_of_a_tiny_resistor_in_an/ | {
"a_id": [
"cfpq7fl",
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"score": [
6,
20,
2
],
"text": [
"Those resistors are there to limit the current. How well they'll do depends on a few things. My guess on the 1 ohm is that the calculator just defaults to 1 ohm when the V_f's and V_s add up to the ... | [] | [
"http://led.linear1.org/led.wiz"
] | [
[],
[],
[]
] | |
2xk27y | Before Britain adopted the Gregorian Calendar in 1752 how did people handle setting deadlines between the different calendars. | If, say, a merchant in France was expecting a shipment from England, how would they communicate what date they were expecting it on? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/2xk27y/before_britain_adopted_the_gregorian_calendar_in/ | {
"a_id": [
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23,
3
],
"text": [
"I unfortunately can't answer that question, but I am curious as to the source of the 1752 adoption of the Gregorian calendar",
"In that specific instance, you're assuming way too much precision in ... | [] | [] | [
[],
[],
[]
] | |
586tt8 | Why was it frowned upon to depict animals and people in Islamic art? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/586tt8/why_was_it_frowned_upon_to_depict_animals_and/ | {
"a_id": [
"d8y1myv"
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"score": [
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"text": [
"Aniconism (prohibition of images) came to Islam by way of Judaism and its own prohibition of graven images. Exactly why Israelite religion adopted aniconism is still a debated question, but it probably predates Judaism, as evidence has been foun... | [] | [] | [
[]
] | ||
1bj70n | Tuesday Trivia | Pranks and japes | Previously:
* [Dissenters and iconoclasts](_URL_6_)
* [Great stories of revenge](_URL_9_)
* [Great (and not so great) comebacks](_URL_10_)
* [For want of a nail...](_URL_7_)
* [Legal cases and court rulings](_URL_3_)
* [If I Were A Rich Man](_URL_0_)
* [The Good Old Days](_URL_2_)
* [Best Friends Forever!](_URL... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1bj70n/tuesday_trivia_pranks_and_japes/ | {
"a_id": [
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"text": [
"There was a question yesterday about pranks in history which I r... | [] | [
"http://www.reddit.com/r/AskHistorians/comments/17y14l/tuesday_trivia_if_i_were_a_rich_man/",
"http://www.reddit.com/r/AskHistorians/comments/171l9q/tuesday_trivia_best_friends_forever/",
"http://www.reddit.com/r/AskHistorians/comments/17hgls/tuesday_trivia_the_good_old_days/",
"http://www.reddit.com/r/AskHis... | [
[],
[],
[
"http://en.wikipedia.org/wiki/Dreadnought_hoax"
],
[
"http://en.wikipedia.org/wiki/Berners_Street_Hoax"
],
[
"http://en.wikipedia.org/wiki/Piltdown_Man"
],
[
"http://en.wikipedia.org/wiki/San_Serriffe"
],
[
"http://en.wikipedia.org/wiki/Spaghetti_tree_hoax"
],
[... | |
2yrsor | Best Books on History of Jerusalem | I was wondering if there are any good books that cover the complete history of Jerusalem in detail from around 4500 BCE to modern era.
A book that covers this timeline: _URL_0_ | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/2yrsor/best_books_on_history_of_jerusalem/ | {
"a_id": [
"cpcm3eb"
],
"score": [
3
],
"text": [
"*Jerusalem: The Biography*, by Simon Sebag Montefiore. Exactly what you're looking for."
]
} | [] | [
"http://en.wikipedia.org/wiki/Timeline_of_Jerusalem"
] | [
[]
] | |
5ahjc6 | What were the roles of Jews in the Crusades? Did they generally side with the Muslims or the Christians? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/5ahjc6/what_were_the_roles_of_jews_in_the_crusades_did/ | {
"a_id": [
"d9gp00i",
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"score": [
34,
538
],
"text": [
"Additional question: Was there a significant population of Jews in Palestine/Jerusalem during the time of the Crusades?",
"One of the less-observed comparative phenomena of the heart of the Crusades era--the very end ... | [] | [] | [
[],
[]
] | ||
6f35hg | Does Darwin's Law of Evolution by Natural Selection still hold true in modern times with respect to humans? | Due to availability of top notch healthcare even the negative traits are being passed , we are living longer lives and even the most ill people are able to procreate due to excellent health facilities.Has darwin's law of survival of the fittest become redundant in this context? | askscience | https://www.reddit.com/r/askscience/comments/6f35hg/does_darwins_law_of_evolution_by_natural/ | {
"a_id": [
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"text": [
"No, redundancy implies that evolution has a goal, or an end game. Evolution is still o going because change is always occurring. A speciation event is unlikely to occur however, until a population of ... | [] | [] | [
[],
[
"https://www.reddit.com/r/AskScienceDiscussion/comments/6dcpu4/has_modern_medicine_decreased_the_rate_of_human/",
"https://www.reddit.com/r/evolution/comments/3uiz5l/do_people_really_think_humans_are_no_longer/",
"https://www.reddit.com/r/explainlikeimfive/comments/2735zn/eli5_did_we_stop_natura... | |
7d6omo | to what extent, if any, does the large amount of space debris around earth affect global warming? | I was watching a space debris video here...
> _URL_0_
...and was thinking about the micro copper filament experiment in the 20th century. If there is no significant affect by space debris on global warming, how much debris might be needed to see an affect? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/7d6omo/eli5_to_what_extent_if_any_does_the_large_amount/ | {
"a_id": [
"dpvfhau",
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"score": [
2,
4
],
"text": [
"Very little right now. You would need enough debris in orbit to make space flight impossible, and it would cause bigger problems for our weather patterns.",
"We would need to actively blot out portions of sunlight, and ... | [] | [
"http://www.esa.int/Our_Activities/Operations/gse/ESA_Space_Debris_Office"
] | [
[],
[]
] | |
4g9sxg | why do many people, when in a rested position, rapidly tap their feet? | I find many people (including myself) tapping away at their feet seemingly uncontrollably while they sit or lie back. Is it something to do with ADD? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4g9sxg/eli5_why_do_many_people_when_in_a_rested_position/ | {
"a_id": [
"d2fpc4o",
"d2g9ypj"
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"score": [
3,
3
],
"text": [
"Restless leg syndrome. It's just a compulsion, we kinda feel an urge coming, and then when we do it, it gives a sense of relief. ",
"It's not RLS. It's what is mostly referred to as \"nervous energy\" or hyperactivity. I... | [] | [] | [
[],
[]
] | |
6wui5z | with all of the flooding in texas how are people not being electrocuted staying in their houses, standing in water near electrical outlets? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/6wui5z/eli5_with_all_of_the_flooding_in_texas_how_are/ | {
"a_id": [
"dmauolu"
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"score": [
2
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"text": [
"When a short is caused on the electrical grid, the local breaker goes. Thus, there's generally not electricity where flooding has reached the electrical wiring.\n\nWater is actually an insulator, but dirty water is conductive. Humans are more c... | [] | [] | [
[]
] | ||
x4x2e | automobile turbochargers & intercoolers, and how they work together. | I know the basic principles, but to hear it again from someone else would be benficial.
Turbo's force fuel into the engine, and the intercooler recycles the air that's being expelled?
Thanks. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/x4x2e/eli5_automobile_turbochargers_intercoolers_and/ | {
"a_id": [
"c5j7vc5"
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"score": [
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"text": [
"Turbos force air into the engine. It is, by definition, an air compressor.\n\nWhen you compress something, it gets hot. Inflate a tire with a bicycle pump and feel the pump cylinder after the fact...\n\nInnercoolers are heat exchangers, radiators... | [] | [] | [
[]
] | |
8jo51q | Why did the conservatives lose the 1906 UK general election so badly? | I recently read that it can be seen as a negative vote against the conservatives rather than a positive vote for the liberals but i'm struggling to find a summary of what the conservatives did so badly wrong?
Thanks | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/8jo51q/why_did_the_conservatives_lose_the_1906_uk/ | {
"a_id": [
"dz1npjs"
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"text": [
"1906 was a disastrous result for the Conservatives and Unionists. Dutton included this Amery quote in his reassessment of Unionist politics post-1906: \n\n > Never in the whole period between the Great Reform Bill and the Socialist victory of 1... | [] | [] | [
[
"http://i.dailymail.co.uk/i/pix/2010/04/27/article-1269192-094029E3000005DC-353_306x207.jpg"
]
] | |
15n0l3 | Why was Cicero so highly regarded during the Enlightenment? | I have finished a biography of Cicero, and he seems the best of a bad lot during the late Roman Republic. His career seemed to fall apart in the same way that the Republic fell apart under the pressures of the era.
So it surprises me that he received such effusive praise in the 18th century from figures like John A... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/15n0l3/why_was_cicero_so_highly_regarded_during_the/ | {
"a_id": [
"c7nxs72"
],
"score": [
32
],
"text": [
"One reason is that he is an exceptionally good prose stylist. Arguably the only prose stylist to match him was Augustine, although even Augustine doesn't have the same sort of polished perfection as Cicero. It is really impossible to render in E... | [] | [] | [
[]
] | |
qom1q | the differences between vga, dvi, and hdmi | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/qom1q/eli5_the_differences_between_vga_dvi_and_hdmi/ | {
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"**VGA** is an analog video signal, as opposed to a digital signal. A digital signal is when you send the image as a stream of zeroes and ones. An analog ... | [] | [] | [
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"http://ecx.images-amazon.com/images/I/411VFP0HAZL._SL500_AA300_.jpg",
"http://www.2direkt.de/i-sell2u/images/bilder/AH0001.jpg"
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162wie | polysexuality | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/162wie/eli5_polysexuality/ | {
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"Do you mean Pansexuality?",
"The simple version is that polysexuality is just sexual attraction to multiple genders and usually, thought not *necessarily*, both sexes. The [wi... | [] | [] | [
[],
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"http://en.wikipedia.org/wiki/Polysexuality"
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"http://www.youtube.com/watch?v=Bv5k9w6Hpi4"
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6e92nm | Genocide under the Nazi Regime. | As of the Nazi's policies of ethnic cleansing, a great number of civilians were killed in Nazi occupied territories, of primarily Jews, Slavs and POWs. However, from all sources I can find on this, these crimes are split into two seperate actions; That of the holocaust and that of generalplan ost. The prior lists prima... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/6e92nm/genocide_under_the_nazi_regime/ | {
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"text": [
"Hi! As this question pertains to basic, underlying facts of the Holocaust, I hope you can appreciate that it can be a fraught subject to deal with. While we want people to get the answers they are looking for, we also remain very conscious that t... | [] | [] | [
[
"https://books.google.com/books?id=Z7FiPwAACAAJ",
"https://books.google.com/books?id=HFB-dkuZzSwC",
"http://holocaustcontroversies.blogspot.de/2012/10/index-of-published-evidence-on.html",
"https://books.google.com/books?id=bx-dZEV228QC",
"https://books.google.com/books?id=Q-0B9-D5Vz4C",
"... | |
7rv90f | How do most wild animals die? | Setting aside insects and microscopic organisms, how does the average, say, gazelle die? Killed by a predator? Disease (what kind of diseases, cancer?)? Accident? Or something else? | askscience | https://www.reddit.com/r/askscience/comments/7rv90f/how_do_most_wild_animals_die/ | {
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"Finding all-cause mortality on populations of animals is difficult to find at best, so take this [study i found](_URL_0_) on white tailed deer with a grain of salt. \n \n \nIn order of mortalit... | [] | [] | [
[
"http://www.pgc.pa.gov/Wildlife/WildlifeSpecies/White-tailedDeer/Documents/Fawn_Survival.pdf"
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[],
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4j8rje | how is an ollie even possible with a skateboard? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4j8rje/eli5_how_is_an_ollie_even_possible_with_a/ | {
"a_id": [
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"text": [
"Start with a skateboard on the ground:\n\n _\n\nWith your right foot, press on the back of the skateboard so that the left tip rises:\n\n \\\n\nOptional: The rising edge of the left side of the board is now firmly pressing against your left... | [] | [] | [
[]
] | ||
4hwqyd | Do all conductors equally conduct electricity and temperature? | Every substance I can think of that's a good conductor of electricity (metals, etc.) are also a good conductor of heat. And things that are good insulators (plastic, wood) also are good insulators of heat/cold. Is there anything that is a good/bad conductor of electricity and oppositely good/bad with heat/cold? | askscience | https://www.reddit.com/r/askscience/comments/4hwqyd/do_all_conductors_equally_conduct_electricity_and/ | {
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"d2teqsv"
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"It's something that will be roughly true if the same particles which conduct most of the heat also conduct most of the electricity. The [Wiedemann-Franz law](_URL_2_) holds for the case where electrons are the main contribution to both (it holds ... | [] | [] | [
[
"https://www.reddit.com/r/askscience/comments/31g9ss/is_it_possible_for_a_substance_to_be_both_an/",
"https://www.reddit.com/r/askscience/search?q=thermal+electric+conductivity&restrict_sr=on&sort=relevance&t=all",
"https://en.wikipedia.org/wiki/Wiedemann–Franz_law"
]
] | |
a8r2fj | how did we human know what bacteria and virus cell made up of? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/a8r2fj/eli5_how_did_we_human_know_what_bacteria_and/ | {
"a_id": [
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"text": [
"We can easily observe bacteria with microscopes. Viruses are much smaller, and usually require electron microscopes to see. Before this, we could determine what they were made of by cultivating them (breeding them) and putting them in a centrifug... | [] | [] | [
[]
] | ||
bsw6gt | how does electrocution in water work? | It’s well known that it’s deadly if you drop a toaster in a bathtub, but what happens if someone drops it in a large swimming pool? What happens when lightning strikes the ocean? Will it kill fish or people in the nearby vicinity? Also why does this electrocute you in the first place? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/bsw6gt/eli5_how_does_electrocution_in_water_work/ | {
"a_id": [
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"text": [
"Let's understand principles first. \n1. The maximum current flow will occur along the path of least resistance.\nThat is it. \n\nNow consider your first scenario.\nIn bathtub, when live wire(the one that is at high alternating voltage) touches th... | [] | [] | [
[
"https://youtu.be/-9dNmFEn3iY",
"https://youtu.be/6Dd6_TghcE0"
]
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98ppdm | - why does a half moon look like a straight line down the center of the moon while a quarter moon shows the curve of the earth? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/98ppdm/eli5_why_does_a_half_moon_look_like_a_straight/ | {
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"A quarter moon doesn't show the curve of the earth, it shows the curve of the moon!\n\nThe dark part of the moon is shaded by the moon itself in the same way that if you stood facing a bright light you... | [] | [] | [
[],
[],
[]
] | ||
o1bzr | Scientifically, how far are we from having the understanding to be able to terraform a planet? | I'm not asking whether or not we have the technological capability to do so at this current point in time, but do we have the understanding needed to accomplish such a thing? | askscience | http://www.reddit.com/r/askscience/comments/o1bzr/scientifically_how_far_are_we_from_having_the/ | {
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"text": [
"Although I can't provide details as to why, Neil Tyson dismissed terraforming as [among the most far-fetched concepts preoccupying the futurist](_URL_0_) in the recent AMA he did ... | [] | [] | [
[
"http://www.reddit.com/r/IAmA/comments/ngd5e/i_am_neil_degrasse_tyson_ama/c38v8pt"
],
[
"http://library.thinkquest.org/C006669/media/Chem/img/Graphs/Phasewater.gif",
"http://www.astro.unipd.it/planets/barbieri/schneider/astronomia/CosmicPerspective_Ch10.pdf",
"http://en.wikipedia.org/wiki/Infr... | |
drwezh | Why were the WW2 era tank engines hugely overpowered by the plane engines? | For example, Japanese Type 97 Chi Ha had 180hp, but Type 0 fighter had nearly 1000hp. I'd imagine they would be exactly the opposite? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/drwezh/why_were_the_ww2_era_tank_engines_hugely/ | {
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"The Zero's radial engine is 1.5 meters long, and 1.1meters wide, according to Wiki.\n\nThat's most of the size of the engine compartment in a Chi-Ha, behind the turret. In that compartment you also need to leave room for cooling system and the f... | [] | [] | [
[
"https://worldoftanks.com/dcont/fb/image/t1e1interior.png",
"https://upload.wikimedia.org/wikipedia/commons/7/77/Heavy-tank-OWI-2.jpg"
]
] | |
6ertms | Askscience Megathread: Climate Change | With the current news of the US stepping away from the Paris Climate Agreement, AskScience is doing a mega thread so that all questions are in one spot. Rather than having 100 threads on the same topic, this allows our experts one place to go to answer questions.
So feel free to ask your climate change questions here!... | askscience | https://www.reddit.com/r/askscience/comments/6ertms/askscience_megathread_climate_change/ | {
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"http://www.lomborg.com/press-release-research-reveals-negligible-impact-of-paris-climate-promises"
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[... | |
9yxjou | Why is there no standardized way of measuring speaker-system audio quality? What makes it difficult to objectively assess? | Sure, there's a big subjectivity factor. But I would have thought there would be a way to holistically (or otherwise) quantify clarity, fidelity, warmth, space, and all the other things audiophiles seem able to discern, but technology apparently can't. | askscience | https://www.reddit.com/r/askscience/comments/9yxjou/why_is_there_no_standardized_way_of_measuring/ | {
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"text": [
"The biggest hurdle is that the impact of the signal's [phase](_URL_0_) on a human's perception is not [fully understood](_URL_2_). This makes it harder to objectively conclude signal A is better than si... | [] | [] | [
[
"https://en.wikipedia.org/wiki/Phase_(waves\\)",
"https://en.wikipedia.org/wiki/Total_harmonic_distortion",
"http://radio.feld.cvut.cz/conf/poster/proceedings/Poster_2017/Section_NS/NS_011_Stepankova.pdf"
],
[],
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"https://arstechnica.com/staff/2015/02/to-the-audiophile-this-10000-ethernet-c... | |
52nebu | Why were floppy disks 1.44 MB? | Is there a reason why this was the standard storage capacity for floppy disks?
| askscience | https://www.reddit.com/r/askscience/comments/52nebu/why_were_floppy_disks_144_mb/ | {
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"text": [
"And as a followup to that what industries if any absolutely rely on floppies?",
"To answer this question, we need to consider the ... | [] | [] | [
[],
[],
[],
[],
[
"https://en.wikipedia.org/wiki/History_of_the_floppy_disk"
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[]
] | |
k6o1j | - how do lightbulbs know the correct wattage to draw from the electrical current. | How does a 60 watt bulb and 20 watt bulb fit into the same socket yet know to draw more or less amps? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/k6o1j/eli5_how_do_lightbulbs_know_the_correct_wattage/ | {
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"text": [
"Wattage is the measure of energy used per time, expressed as joules per second. Amperage is a measure of how much charge is flowing thr... | [] | [] | [
[],
[],
[],
[],
[],
[]
] | |
6ddvek | why are cold showers considered healthy, yet going outside under-dressed puts you at risk of illness? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/6ddvek/eli5_why_are_cold_showers_considered_healthy_yet/ | {
"a_id": [
"di1w8wy",
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"score": [
3,
2
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"text": [
"1. Science has successfully challenged the notion that colds come from being cold. \n\n2. Cold showers are temporary, but if one is trying to do it for health, they should be warm, cold, warm, cold, etc. Cold fo... | [] | [] | [
[],
[]
] | ||
6cvbnk | how is wood kept dry when building a building and it rains? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/6cvbnk/eli5_how_is_wood_kept_dry_when_building_a/ | {
"a_id": [
"dhxn45u"
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"score": [
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"text": [
"Build it as quick as you can when the weather is good then by the time it rains you hope it's got a roof, if it's going to be a drenching rain cover the roof with plastic. \n\nMost of the time water doesn't matter as much when the building is tog... | [] | [] | [
[]
] | ||
3gei8n | how do people get "used to" the cold? | I was just recently in a snow town and when I ask locals how they can be wearing a shirt, their response is usually, I'm used to it. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/3gei8n/eli5_how_do_people_get_used_to_the_cold/ | {
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"text": [
"Body temperature regulation is controlled by a part of the brain called the hypothalamus (which also does a lot of other things). The \"normal\" temperature... | [] | [] | [
[],
[],
[],
[],
[]
] | |
1843cc | When people say that certain cooking or preservation methods 'destroy nutrients' in food what are the actual chemical processes involved? | I know I've heard this a bunch, but I've only ever had an introductory college chemistry course, and don't know much about food science. What is happening in food as it loses nutritional value? Does it lose almost all of it, or just a little bit? | askscience | http://www.reddit.com/r/askscience/comments/1843cc/when_people_say_that_certain_cooking_or/ | {
"a_id": [
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"This depends on the nutrient, food, and cooking method in question. The main mechanism that comes to mind is boiling. Submerging food in a pot of water will leach out lots of water soluble compounds from the food which you c... | [] | [] | [
[],
[]
] | |
6egcpa | how do treasury auctions work? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/6egcpa/eli5_how_do_treasury_auctions_work/ | {
"a_id": [
"dia2k17"
],
"score": [
2
],
"text": [
"Pirate calls Auctioneer. \n\nPirate and Auctioneer negotiate price. \n\nAuctioneer auctions off booty for more than agreed upon price. \n\nPirate decides he doesn't want to sell booty. \n\nAuctioneer and Pirate argue. \n\nPirate steals booty. \n\... | [] | [] | [
[]
] | ||
584kj0 | Do we know why the German forces in WWII didn't try to capture the oilfields and deprive Russia of their fuel source? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/584kj0/do_we_know_why_the_german_forces_in_wwii_didnt/ | {
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"text": [
"They did try to capture the Caucasus oil fields in 1942, it was one of the main objectives of Operation Edelweiss, which was a subsidiary of *Fall Blau*, the great summer offensive of 1942. The main goal of Edelweiss was to capture the Caucasus o... | [] | [] | [
[]
] | ||
2vzthy | What was Alexandria like at its height? I know it had a library, port and admin center. Was there anything special about it? | In many stories about Cleopatra, it makes it look like a cosmopolitan city, much more sophisticated than Rome. Is this true? Were there any other ancient cities that were not exactly tourist destinations, but great places to live. | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/2vzthy/what_was_alexandria_like_at_its_height_i_know_it/ | {
"a_id": [
"comh6zf"
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"score": [
7
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"text": [
"I'm not sure about more sophisticated and cosmopolitan than Rome, but Alexandria was the center of the highly important trade carried in the Indian Ocean, and there is literary documentation of a highly multiethnic community of merchants. Beyond ... | [] | [] | [
[]
] | |
9c4msa | Rubbing the tips of your index finger and middle finger against the tip of your thumb seems to be a universal and cross cultural symbol for money. Where and how did this originate? | For clarification, I mean "the finger thing means the taxes" hand gesture. | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/9c4msa/rubbing_the_tips_of_your_index_finger_and_middle/ | {
"a_id": [
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"text": [
"Do that in Chinese society and people don't understand, unless they've seen it in movies. Put your forefinger and thumb together, like you're gesturing okay, but with your palm up: a coin, the Chinese gesture for money.\nSo your gesture is not un... | [] | [] | [
[]
] | |
z8kpp | How many atoms of a substance, let's say graphite, must be clustered together to be visible to the naked eye? | In other words, take the smallest speck of solid Carbon visible to the naked eye. Approximately many atoms are bonded together in that speck? | askscience | http://www.reddit.com/r/askscience/comments/z8kpp/how_many_atoms_of_a_substance_lets_say_graphite/ | {
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"text": [
"[graphen](_URL_0_) is a one atom layer of graphit; which is visible.",
"Some googling yields a typical size of 0.1 mm at 25 cm distance for objects that are just discernible f... | [] | [] | [
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"http://de.wikipedia.org/wiki/Graphen"
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"http://www.mhhe.com/biosci/ap/saladin/humbody/reading6.mhtml",
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"http://footpathmath.files.wordpress.com/2011/06/hexagons3.png"
],
[]
] | |
h05zk | Where are all the dead animals? | I mean, besides the occasional roadkill, I never see dead animal bodies. With the trillions upon trillions of organism out there, where do all the dead bodies pile up? Decomposition is natural obviously, but should take a good while. Don't living animals avoid consuming already dead ones for fear of disease?
This is m... | askscience | http://www.reddit.com/r/askscience/comments/h05zk/where_are_all_the_dead_animals/ | {
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"text": [
"It doesn't take very long at all. I think you're underestimating the numbers and voracity of carrion feeders like insect larvae and soil organisms. [This study](_URL_0_) gives an... | [] | [] | [
[
"http://www.jstor.org/pss/3543384"
],
[],
[],
[]
] | |
2anw88 | What are protons, neutrons, and electrons made up of? | So I know that atoms make up everything and the things that make up atoms (protons, neutrons and electrons) are the parts of an atom But, what makes up the protons, neutrons, and electrons? Also, if something has to make them up, why isn't that considered the smallest piece of matter? | askscience | http://www.reddit.com/r/askscience/comments/2anw88/what_are_protons_neutrons_and_electrons_made_up_of/ | {
"a_id": [
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12,
3
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"text": [
"[The standard model of particles knows 17 fundamental particles.](_URL_0_) Those particles are considered to be point like particles and not made up of anything smaller.\n\nAs you can see, electrons are fundamental particle... | [] | [] | [
[
"http://en.wikipedia.org/wiki/File:Standard_Model_of_Elementary_Particles.svg"
],
[
"http://en.m.wikipedia.org/wiki/Standard_Model"
]
] | |
8slkxm | the difference between eating 1500 calories without exercise vs eating 1800 calories and burning 300 calories with exercise for a man with a bmr of 1800? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/8slkxm/eli5_the_difference_between_eating_1500_calories/ | {
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2
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"text": [
"You build muscle and stimulate fat loss with exercise and burning calories. You can still lose weight by eating less, but if you also exercise you lower your risk for a lot of diseases related to your heart. Just my best gue... | [] | [] | [
[],
[]
] | ||
8z5jp2 | what reactions does the body have to a haircut ? | I've always found that, even during a quick trim, after about a dozen 'snips', there's a "warm buzz" sensation in me head.
I assume there's some sort of enzyme or hormonal reaction going on to this unexpected snippage ?
I tried asking this a couple years ago ( perhaps poorly ? ) and didn't get much more in the reacti... | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/8z5jp2/eli5what_reactions_does_the_body_have_to_a_haircut/ | {
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"score": [
11,
3,
2,
2,
3,
2
],
"text": [
"I'm afraid this really is just you. The body doesn't have any particular reactions to a haircut.",
"There are no nerves, etc. It's ... | [] | [] | [
[],
[],
[],
[],
[],
[]
] | |
3qetny | how come sometimes when you roll your ankle you can just walk it off, but other times it hurts like crazy and needs days to heal? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/3qetny/eli5_how_come_sometimes_when_you_roll_your_ankle/ | {
"a_id": [
"cwei099",
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2
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"text": [
"It's the same reason you can bash your elbow (funny bone) resulting in mild pain, but slamming your hand full force in to concrete will fracture bones. \n\nNot all injuries are equal, and not all injuries are as easy to shak... | [] | [] | [
[],
[]
] | ||
88g70o | how does wifi work with multiple devices? | Is the speed split evenly? is it downloading and sending a certain amount per device like 10kb for you, 10kb for you. Does my streaming a movie slow down others while it focuses on large files, or does it slow it for me as well evenly? Is there a limit to amount of devices? How does it know which device to send the nex... | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/88g70o/eli5how_does_wifi_work_with_multiple_devices/ | {
"a_id": [
"dwkdbf6"
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"score": [
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"text": [
"Imagine wifi like a post office. \n\nEach device connected is like a different customer. It has a different name to the others and has its own little box items get sent to and from. \n\nThere is a team of workers called “Bandwidth” - these guys m... | [] | [] | [
[]
] | |
4h8tok | "History will be kind to me for I intend to write it." -How kind has history been to Churchill? How do his historical works stand up today? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/4h8tok/history_will_be_kind_to_me_for_i_intend_to_write/ | {
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"text": [
"Dear readers, if you can't say anything about the historical works Churchill wrote - and he did write them - please don't post. Fu... | [] | [] | [
[],
[],
[],
[],
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"http://www.telegraph.co.uk/history/world-war-one/11561066/Gallipoli-was-Churchills-folly-but-not-only-his.html"
],
[]
] | ||
b0uwfa | how does soil liquefaction work? | Just saw a .gif showing the earth acting like jello, but Wikipedia is using big person language that's making my brain hurt. | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/b0uwfa/eli5_how_does_soil_liquefaction_work/ | {
"a_id": [
"eihdbas"
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"text": [
"Soil is little grains. It's firm because when you press it the grains push against each other to resist you. Water can mix in with the grains, increasing the space between the grains. A little water lets the grains shift a little, until they can... | [] | [] | [
[]
] | |
fympjo | why do you stop getting 'stitches' when running as you get older and/or have been a runner for longer? | My 19 year old daughter had started running again ('couch to 5k') after having not really done much exercise for six years (she used to be a good junior runner). She gets terrible stitches and I really feel for her.
My wife and I have run since we were young and we both remember getting a lot of stitches when we were ... | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/fympjo/eli5_why_do_you_stop_getting_stitches_when/ | {
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"text": [
"Stitches are more or less muscle cramps in the muscles that help you breathe, the more you exercise, the stronger and more endurance they get just like any other muscle"
]
} | [] | [] | [
[]
] | |
2g7kwq | when dinosaurs went extinct, how can scientist say that they evolved into birds? | I'm no expert but doesn't an E.L.E. (extinction level event, thanks Deep Impact) pretty much wipes out everything that can't survive? Wouldn't it take a really really long time for a Dinosaur to evolve into a birds as we know it today? Wouldn't they have died out long before they had a chance to?
Edit: Thank you for d... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2g7kwq/eli5_when_dinosaurs_went_extinct_how_can/ | {
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"text": [
"By the time of that meteor, many types of dinosaurs had already evolved into birds. Birds and dinosaurs lived side by side for quite a while.\n\n_URL_0_",
"Put it this way, *h... | [] | [] | [
[
"http://youtu.be/vNZF6ynlyxM"
],
[],
[],
[]
] | |
10fzrd | How accurate is the chemistry of Breaking Bad? | Specifically, can methylamine be used as a substitute for Pseudoephedrine in order to make methamphetamine? And, if so, does doing that make said meth a blue color?
Are there any other parts of the chemistry of the show that are way off? | askscience | http://www.reddit.com/r/askscience/comments/10fzrd/how_accurate_is_the_chemistry_of_breaking_bad/ | {
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"http://www.reddit.com/r/askscience/search?q=breaking+bad&restrict_sr=on"
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"http://www.reddit.com/r/IAmA/comments/v17kn/iama_former_meth_lab_operator_amaa/c50e57f",
"... | |
22v2gy | Why did Dutch become so distinct? | Why did Dutch become distinct enough to be it's own language when other medieval dialects of German didn't shift as far apart? Does it have to do with French influence? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/22v2gy/why_did_dutch_become_so_distinct/ | {
"a_id": [
"cgqnsdk",
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"score": [
23,
51
],
"text": [
"This might be better posed to /r/linguistics ",
"Dutch isn't descended from German. It's descended from Old Low Franconian, which is simply another Germanic language, that came from Proto-Germanic."
]
} | [] | [] | [
[],
[]
] | |
68u17l | How do forward swept wings on an aircraft differ from a Delta wing and a straight wing? | I know the basics of lift, however I was curious about how these wing types differ. Thanks! | askscience | https://www.reddit.com/r/askscience/comments/68u17l/how_do_forward_swept_wings_on_an_aircraft_differ/ | {
"a_id": [
"dh1ajns",
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"score": [
2,
7
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"text": [
"The wing designs change the aerodynamics of the aircraft. Most importantly, the wing configurations changes the stability of the aircraft under different flight profiles. Essentially, there's a trade off between speed, maneu... | [] | [] | [
[],
[]
] | |
1lu6sb | why does cigarette smoke rise in a straight column then become wiggly? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1lu6sb/eli5_why_does_cigarette_smoke_rise_in_a_straight/ | {
"a_id": [
"cc2sobn"
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"text": [
"Hot air, as everyone knows, rises. So immediately above the burning tip of a cigarette, the air is very hot. And because it's hot it rises quickly and carries the smoke with it in a straight line.\n\nAs it rises the hot air begins to cool and the... | [] | [] | [
[]
] | ||
k4jdq | How long does it take for muscles to grow or to lose fat after you work out? | Say you worked out today and you did cardio and weights... how long would it take for you to lose the fat from your body? How long does it take for your muscles to repair itself and become larger?
Edit 1: Okay... so I was monitoring the comments and nothing really happened... I mean, one guy linked to some website, ... | askscience | http://www.reddit.com/r/askscience/comments/k4jdq/how_long_does_it_take_for_muscles_to_grow_or_to/ | {
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... | [] | [
"http://i.imgur.com/FWtcW.png"
] | [
[],
[],
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"http://www.reddit.com/r/Fitness/comments/k4ool/raskscience_xpost_how_long_does_it_take_for/"
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"http://jap.physiology.org/content/65/1/1.short"
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"http://www.ncbi.nlm.nih.gov/pubmed/9252485",
"http://www.leangains.com/2010/05/early-morning-fasted-training.html",
... | |
dm94cf | - why do humans generally tend to prefer “complimentary” color schemes? is there a particular reason our brains almost systematically reject pairings of colors that don’t seem to “go together”, especially in living environments? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/dm94cf/eli5_why_do_humans_generally_tend_to_prefer/ | {
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4,
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"text": [
"In terms of complimentary colors I believe it has to do with contrast. Since they are polar opposites on the color wheel it means they are the furthest away from each other, Think blue/orange red/gre... | [] | [] | [
[],
[],
[]
] |
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