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 |
|---|---|---|---|---|---|---|---|---|---|
925yal | why do some house flies bumble round seemingly randomly, whilst others fly in straight lines and make short, sharp turns? | [deleted] | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/925yal/eli5_why_do_some_house_flies_bumble_round/ | {
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"Lines means they're seeking food or shelter, zigzags mean they've found a comfortable temperature in the room to just be annoying in."
]
} | [] | [] | [
[]
] | |
3zbyp1 | Why is a Bayonet Charge Terrifying enough to break formations of disciplined soldiers? Even if your heavy machinegun is loaded to the max and you can just spray fire on them? | This one thing that I've been wondering for years.
I remember 4 years ago, the History Channel showed an Episode on their TV Series "Human Weapon" which showcases various martial arts around the world. This episode I speak of went over MCMAP, the Hand-to-Hand system of the Marine Corps.
During the episode, there was ... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/3zbyp1/why_is_a_bayonet_charge_terrifying_enough_to/ | {
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"Follow up question..... I'm new here and don't know if this is allowed..... But it's something I've often wondered. I remember seeing an episode of happy... | [] | [] | [
[],
[],
[],
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"http://allthingsliberty.com/2013/07/the-inaccuracy-of-muskets/"
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6toc9y | i know that oil is from plants and animal bones, but how do it actually become oil? what happens with the bones and plants? | As the title asks. | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/6toc9y/eli5i_know_that_oil_is_from_plants_and_animal/ | {
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"text": [
"Most plants contain oils and waxes. Olives, sunflower seeds, rapeseed plants, amongst others, have enough to press out and sell in supermarkets. When they die and get buried, bacteria digest the material and split large molecules into smaller f... | [] | [] | [
[]
] | |
bycw3h | Are astronauts aboard the international space station able to use cellphones and other personal devices that connect to the internet? | askscience | https://www.reddit.com/r/askscience/comments/bycw3h/are_astronauts_aboard_the_international_space/ | {
"a_id": [
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"text": [
"Yes they can, to some certain extent. They have special computers that receive data dumps, or what most people would call: a shitload of messages and videos from family on earth. This goes both ways so u could call it a cellphone"
]
} | [] | [] | [
[]
] | ||
6wzzqq | why does whole grain food cost more if it presumably requires less processing? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/6wzzqq/eli5_why_does_whole_grain_food_cost_more_if_it/ | {
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"text": [
"Often whole grains contain components which will go bad (rancid) within months if not refrigerated. So it isn't as easy to store.",
"The fact that they ... | [] | [] | [
[],
[],
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1ioi43 | Up to what point in the umbilical cord would be the gap between the baby's DNA and the mother's? | askscience | http://www.reddit.com/r/askscience/comments/1ioi43/up_to_what_point_in_the_umbilical_cord_would_be/ | {
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"The entirety of the umbilical cord is formed from the zygote - the fertilized egg - and therefore will consist entirely of cells with the same DNA as the baby, not the mother.\n\nThe \"division\" in terms of cell DNA is at the placenta - one sid... | [] | [] | [
[]
] | ||
d0cbvj | how does one suddenly develop a mid-life nut allergy and is it possible to reverse it? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/d0cbvj/eli5_how_does_one_suddenly_develop_a_midlife_nut/ | {
"a_id": [
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"text": [
"We don't really know why adults develop allergies later in life. We don't really understand why it happens in childhood, but we understand that more than with adults."
]
} | [] | [] | [
[]
] | ||
1absyq | How does doxycycline help to fight acne? | many people are prescribed [doxycycline](_URL_0_) for acne/cystic acne. It is also for an extended period of time.
During treatment times new pimples and or cysts form as well. So how does this help? And wouldn't long term use create super bacteria as well as causing side effects in the body? | askscience | http://www.reddit.com/r/askscience/comments/1absyq/how_does_doxycycline_help_to_fight_acne/ | {
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"text": [
"Some background:\n\nAcne pathophysiology involves a hormonal component, an infectious component, and an inflammatory component. The disease process starts with an abnormal proliferation of the keratinocytes (skin cells) that line the top of a ha... | [] | [
"http://en.wikipedia.org/wiki/Doxycycline"
] | [
[
"http://www.ncbi.nlm.nih.gov/pubmed/?term=17649854",
"http://www.ncbi.nlm.nih.gov/pubmed/?term=9762064"
]
] | |
2xq29q | the major points from steven pinker | He's got a bunch of books and:
1. I don't know where to start
2. I have very little time
but
3. I've heard very great things about this man.
Also, where in philosophy, morality and linguistics do his ideas fit in, and how much credibility does he have, ie do his ideas generally reflect our current knowledge? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2xq29q/eli5_the_major_points_from_steven_pinker/ | {
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"text": [
"1) Read the wikipedia pages if they exist, they will summarize the arguments for you. On top of that, skim through the chapter titles, then look for things that look like concluding paragraphs or important recap points. These are techniques I use... | [] | [] | [
[
"http://stevenpinker.com/files/pinker/files/sociology-2015-pinker-0038038514556797.pdf"
]
] | |
1j1rj6 | "short selling" stock or a house. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1j1rj6/eli5_short_selling_stock_or_a_house/ | {
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"These are different things. \n\nA short sale on a house usually means the house is being sold for less than is currently owed on it. So for example you owe $500,000 on a house but because prices have declined and you can't afford your payments yo... | [] | [] | [
[]
] | ||
1hbvsq | How is dark energy making the universe expand faster than it should be? | I know that's the general consensus, but how exactly is it happening? | askscience | http://www.reddit.com/r/askscience/comments/1hbvsq/how_is_dark_energy_making_the_universe_expand/ | {
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"text": [
"That's the million dollar question. The problem is we don't know what dark energy is, so we don't know how it's making the universe expand. We just know the universe is expanding faster than it should be - the expansion is a... | [] | [] | [
[],
[]
] | |
54r5ck | trickle down economics from the perspective of both a large corporation and small business. | Edit: Would be helpful to also understand how this would vary depending on if the tax is changed for an individual vs a business. | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/54r5ck/eli5_trickle_down_economics_from_the_perspective/ | {
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"text": [
"The concept is that when those 'at the top' gain, the gains 'flow down to those not at the top'. That theoretical framework doesn't change if you're talking about a Large Corporation, a Small Business, or the .01% of taxpaying individuals.\n\nIf ... | [] | [] | [
[]
] | |
7wmfdj | what is the difference between a $10 hdmi cord and a $150 gold plated hdmi cord? how are some high speed and some 'ultra high speed'? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/7wmfdj/eli5_what_is_the_difference_between_a_10_hdmi/ | {
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"text": [
"No difference what’s so ever. HDMI is digital. 1s and 0s no in betweens. One of the biggest cons going is expensive HDMI cables. ",
"So, the term \"high speed\" or \"ultra high speed\" is pretty me... | [] | [] | [
[],
[],
[]
] | ||
2rv9iw | If I were to manually arrange the particles of water into a rigid structure, could I create ice that doesn't melt? | askscience | http://www.reddit.com/r/askscience/comments/2rv9iw/if_i_were_to_manually_arrange_the_particles_of/ | {
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"text": [
"How are you manually doing this, and once you arrange them are you holding them in place with the same techinque?\n\nIf you managed to arrange water molecules at a temp above 0 C in a rigid lattice they would be thermodynam... | [] | [] | [
[],
[]
] | ||
ofopm | When a baby is in the womb, does it share it's blood with it's mother? And if so, when does the baby develop it's own blood? | I was thinking about how the umbilical cord provides many means to the baby. Blood flow I think is one of them. | askscience | http://www.reddit.com/r/askscience/comments/ofopm/when_a_baby_is_in_the_womb_does_it_share_its/ | {
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"text": [
"Babies do not share the blood with their mother, they may even have different blood types.",
"For the most part the blood of the fetus and the blood of the mother are separate. It would be disastro... | [] | [] | [
[],
[
"http://www.nytimes.com/2011/10/18/business/sequenom-test-for-down-syndrome-raises-hopes-and-questions.html?pagewanted=all"
],
[]
] | |
1j942m | What was the economic system of Nazi Germany like? I know it was the National Socialist party, but what was the real connection between the government and industry like? How would it compare today? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1j942m/what_was_the_economic_system_of_nazi_germany_like/ | {
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"Relevant Threads:\n\n[Some people like to claim that Nazi Germany was far right when it came to social policies, but far left when it came to economics. In reality, how did Nazi Germany's economy run o... | [] | [] | [
[
"http://www.reddit.com/r/AskHistorians/comments/1e5ofg/when_nazi_germany_imported_goods_from_other/",
"http://www.reddit.com/r/AskHistorians/comments/1e0hmf/to_what_extent_was_nazi_germanys_economic/",
"http://www.reddit.com/r/AskHistorians/comments/1ik4rn/how_did_germany_pay_for_military_equipment_fo... | ||
1txzed | how are electronics in cars grounded if the tires prevent electricity running through them? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1txzed/eli5_how_are_electronics_in_cars_grounded_if_the/ | {
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"The electrical system of the automobile creates its own \"ground\", which is more-often-than-not connected to the negative terminal of the battery.\n\n\"Ground\", in this instance, is used in the sense of a connection being ... | [] | [] | [
[],
[]
] | ||
1k4z9e | Does solar panel output really vary that much? | How much does the output of a solar PV panel output vary?
I've seen papers mention the 'future of irradiation' as if in a few years time the sun's output will have dropped dramatically. Do things like sun spots/solar flares really cause a great difference in output?
Similarly, is there a huge difference in output bet... | askscience | http://www.reddit.com/r/askscience/comments/1k4z9e/does_solar_panel_output_really_vary_that_much/ | {
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"text": [
"Assuming the solar panels themselves are stable enough, there are two main causes for the variation in their output, 1) variations in the amount of radiation emitted by the sun and 2) variations in how much of the emitted sunlight reaches the pan... | [] | [] | [
[]
] | |
1nmeu7 | Why will a piece of ceramic break safety glass, but a similar sized rock just bounces off? | As can be seen in this video:
[Ceramic vs. Rock](_URL_0_)
Why does this work? | askscience | http://www.reddit.com/r/askscience/comments/1nmeu7/why_will_a_piece_of_ceramic_break_safety_glass/ | {
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"text": [
"The ceramic used in spark plugs is extremely hard compared to your typical \"rock\". In addition, the corners are very sharp. This concentrates the force of the hit to a small ... | [] | [
"http://www.youtube.com/watch?v=QhlmKHbPFhU"
] | [
[],
[],
[
"http://www.youtube.com/watch?v=xe-f4gokRBs"
],
[]
] | |
d2yzow | how we detect water in the atmosphere of a planet 110 light years away. | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/d2yzow/eli5_how_we_detect_water_in_the_atmosphere_of_a/ | {
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"text": [
"We use super-powerful telescopes that can look out into space in a wide range of spectrums of light. \n\n\nSo when we start looking for potentially habitable planets, what we often start with is finding planets that are o... | [] | [] | [
[],
[]
] | ||
cek479 | What were the main reasons for some of the alliances in WW1 | Sorry I’m advance if this isn’t the correct place to put this or if I have broken any rules, but what the hell was going on with all the alliances and enemies in ww1? I’ll show all the ones I have problems understanding. V will signify enemies and X will signify allies.
Austria x Germany
It’s my understanding that Pr... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/cek479/what_were_the_main_reasons_for_some_of_the/ | {
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"Some of these are outside my area of expertise, I'll highlight those while answering what I can:\n\n**Austria x Germany**\n\nThis Alliance stems from the Bismarckian efforts to portray Germany as peacemaker in Europe and to strengthen the German ... | [] | [] | [
[]
] | |
25yqfy | what is the difference between a $300 watch and a $10,000 watch? is it more than brand name? | All watches tell time and when you spend in the couple hundred dollar range you can be sure you are getting a precision instrument that will keep time consistently.
I know there is a difference in shitty $10 watch pieces from more expensive ones, but when you are getting to say a Citizen to a Breitling or Rado what i... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/25yqfy/eli5_what_is_the_difference_between_a_300_watch/ | {
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"it's brand, materials used used like diamonds, gold, silver, titanium. instead of steel or plastic. and precision. some watches loses... | [] | [] | [
[],
[],
[],
[],
[
"http://i.imgur.com/4eeMy0S.jpg",
"http://www.minus4plus6.com/PriceEvolution.htm",
"http://i.imgur.com/orBAdZn.jpg",
"http://i.imgur.com/34TgAoa.jpg"
],
[]
] | |
29iaqo | Why was there a need for the United Nations Partition Plan for Palestine in 1947? | Why segregate them? I thought the U.S. would be all for "equality for all", in light of the whole racial segregation thing in the U.S.
Interesting to see both sides here, if possible. | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/29iaqo/why_was_there_a_need_for_the_united_nations/ | {
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"This is a *huge* topic. I'm going to try to give both perspectives to you now, but be aware that there is *no way* anyone could analyze the entire history leading up to the partition plan without a lot of conflict.\n\nSo what I've decided to do ... | [] | [] | [
[]
] | |
36brxp | The definition of a second is "the duration of 9192631770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom." How/why was this (seemingly arbitrary) value chosen? | Sorry for the long title. | askscience | http://www.reddit.com/r/askscience/comments/36brxp/the_definition_of_a_second_is_the_duration_of/ | {
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37,
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3,
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3,
2,
2,
... | [] | [] | [
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"http://en.wikipedia.org/wiki/Ephemeris_time"
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[],
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"https://www.youtube.com/watch?v=ZMByI4s-D-Y"
],
[
"http://www.leapsecond.com/history/1958-PhysRev-v1-n3-Markowitz-Hall-Essen-Parry.pdf",
"https://en.wikipedia.org/wiki/Newcomb%27s_Tables_of_the_Sun",
"https://www.reddit.com/r/as... | |
57v93s | Why isn't the American Revolutionary War considered a civil war? | Since civil war is defined as two organized groups fighting within the same country (or state) with reasons including taking control of a region, achieving independence or changing governments, why isn't the American Revolutionary War considered a civil war since it was to achieve independence? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/57v93s/why_isnt_the_american_revolutionary_war/ | {
"a_id": [
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"text": [
"You might want to check out Alan Taylor's new book, American Revolutions. He frames the war as a civil war within the colonies.",
"The American colonies were expressly a subservient part of the ... | [] | [] | [
[],
[],
[]
] | |
5uo4fp | how does the "ping" command on the terminal actually work? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/5uo4fp/eli5_how_does_the_ping_command_on_the_terminal/ | {
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"Simpler explanation:\n\nI write you a letter that says \"This letter was sent from < my address > on < date > and < time > . Please send me a letter back as soon as you get this, with the exact time and date you received this.\n\nYou follow ... | [] | [] | [
[]
] | ||
iwlk4 | Is it actually feasible for a spacecraft to land on a planet sci-fi style? | Watching the [last shuttle landing](_URL_0_) got me thinking: All of the space craft we build have a crash and burn style of landing. Is it actually feasible to build a craft which can land in more of a fictional sci-fi fashion where flies directly into a planet's atmosphere and lands gently? | askscience | http://www.reddit.com/r/askscience/comments/iwlk4/is_it_actually_feasible_for_a_spacecraft_to_land/ | {
"a_id": [
"c278dla"
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"text": [
"It's feasible, but not practical. The shuttle re-entry really isn't all that unpleasant. Most atmospheric reentries are unpowered because power means fuel means mass. Gentle landings are a luxury which would mean losing a significant amount of ... | [] | [
"http://www.nasa.gov/multimedia/imagegallery/image_feature_2014.html"
] | [
[]
] | |
w5iyh | Is there anything to the idea of our perception of time being completely subjective? | In science fiction and fantasy you often see things happen to characters where they experience hours or days or even years while little to no time passes in the real world. While I'm aware that time perception can change somewhat (e.g., [Flow](_URL_0_) vs. boredom), that degree of subjectivity--where there is basically... | askscience | http://www.reddit.com/r/askscience/comments/w5iyh/is_there_anything_to_the_idea_of_our_perception/ | {
"a_id": [
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3
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"text": [
"[Searched](_URL_4_)\n\nRelevant [discussion](_URL_3_)\n\nOriginal question by [SirWinstonPoopsmith](_URL_2_)\n\n > I was just curious to know if, from head injury, drugs, sense-deprivation, or something else, it's common for... | [] | [
"http://en.wikipedia.org/wiki/Flow_%28psychology%29"
] | [
[
"http://www.reddit.com/user/buttermouth",
"http://www.youtube.com/watch?v=w9AtFLs_YYw&feature=player_embedded&list=PL57C42BC5C1CE9D83#",
"http://www.reddit.com/user/SirWinstonPoopsmith",
"http://www.reddit.com/r/askscience/comments/km8fw/is_it_possible_for_someone_to_alter_their/",
"ht... | |
3zoddx | how do podcast apps work? | I'm using an app for android called Player FM that lets me subscribe to particular podcasts, but recently I've noticed there are duplicate subscriptions to the same podcast available on the catalog. Are these duplicates people submitting duplicate RSS feeds to the app catalog? In general, how do podcast apps fetch list... | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/3zoddx/eli5how_do_podcast_apps_work/ | {
"a_id": [
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"text": [
"The app once every time interval (you can usually change this) downloads RSS feeds and compares the feed to It's own database. If there are new entries it automatically downloads the file from the URL specified in the RSS feed and marks that epis... | [] | [] | [
[]
] | |
1m2jna | Can a genetic disease make you immune to another disease? | For example, having a sickle cell genes means far less severe symptoms of malaria if contracted. Are there other genetic "disorders" that actually have a large benefit, or an unforeseeable benefit? Benefit could include relatively healthy life, or the ability for researchers to one day learn mechanisms to provide a cur... | askscience | http://www.reddit.com/r/askscience/comments/1m2jna/can_a_genetic_disease_make_you_immune_to_another/ | {
"a_id": [
"cc58fpo",
"cc58p4d",
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"score": [
2,
2,
4
],
"text": [
"This book [Survival of the Sickest]( _URL_0_ ) covers a lot of these ideas. \n\n > Whether he is discussing hemochromatosis (a disorder that causes massive amounts of iron to accumulate in individuals)... | [] | [] | [
[
"http://www.amazon.com/gp/aw/d/0060889667"
],
[
"http://www.psychologytoday.com/blog/the-imprinted-brain/201302/why-early-blindness-prevents-schizophrenia",
"http://www.frontiersin.org/Psychopathology/10.3389/fpsyg.2012.00624/abstract",
"http://genetics.thetech.org/original_news/news13",
"... | |
1oz9u8 | Why did Santa Anna have such a difficult time taking the Alamo | My understanding is that Santa Anna received decent tutelage under Napoleon in France, and was fighting against a loosely banded bunch of Texans holding out in a ramshackle fort. Why wasn't he able to squash them without much issue? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1oz9u8/why_did_santa_anna_have_such_a_difficult_time/ | {
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"text": [
"Santa Anna moved as quickly as he could once he received news of the Texan rebellion. He massed his troops south of Texas, leaving a political flunky in charge of the presidency in Mexico City. He expected no problems returning to the seat of pow... | [] | [] | [
[]
] | |
5dn283 | Would it be in any way correct to say that there was a culture of honour suicide amongst the Late Roman Republic's political and military elite? Was there a particular etiquette surrounding taking one's own life? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/5dn283/would_it_be_in_any_way_correct_to_say_that_there/ | {
"a_id": [
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"text": [
"In battle, there was no expectation that a defeated general should deliberately seek out his own death in the Late Republic (Rosenstein 120). However, defeated generals often did seek out death if the alternative was to be captured, and a death ... | [] | [] | [
[]
] | ||
2bs5mh | Will Relativity Cause Near Light Speed Travel to Feel Even Faster? | Say a space traveler is making the 4ly voyage to ACen at near C. Because his time is so dilated, would his relative temporal experience be much shorter than 4 years, making it feel as though he beat his mathematical arrival time? | askscience | http://www.reddit.com/r/askscience/comments/2bs5mh/will_relativity_cause_near_light_speed_travel_to/ | {
"a_id": [
"cj8eccs",
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"text": [
"From Wikipedia:\n\n > > Common sense would dictate that if time passage has slowed for a moving object, the moving object would observe the external world to be correspondingly \"sped up\". Counterintuitively, special rela... | [] | [] | [
[
"http://en.m.wikipedia.org/wiki/Time_dilation"
],
[]
] | |
6pzzt0 | how do slang words (like selfie) and memes go from being completely unknown to viral sensations? | I've always wondered if it starts with just one person posting and then by some miracle it just takes off.., | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/6pzzt0/eli5_how_do_slang_words_like_selfie_and_memes_go/ | {
"a_id": [
"dkthvd2",
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"score": [
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"text": [
"[Slang Gang](_URL_0_) might be a good place to start?",
"Think of the term \"friendzone.\"\n\nThe act of a woman putting a man who wants to date them in a platonic state, is as old as humanity. I'm sure ancient cultures ... | [] | [] | [
[
"https://youtu.be/pEDit2uJCvY"
],
[]
] | |
f7elki | when pregnant mothers drink alcohol or use drugs, do the babies feel the effects? | [deleted] | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/f7elki/eli5_when_pregnant_mothers_drink_alcohol_or_use/ | {
"a_id": [
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"text": [
"Yes, not sure about the strength of the hit for the baby though. But you do get all the bad stuff dead brain cells if you drink. Or addiction , babys can be born addicted to crack and have to go throug... | [] | [] | [
[],
[],
[
"https://www.nhs.uk/conditions/foetal-alcohol-syndrome/"
]
] | |
6h2afk | Why did shrapnel shells fall out of use? | The Wikipedia article explains that in the strict sense the last use was in Burma in 1943. Why did shrapnel cease being effective? I understand its limits in a trench war, but surely there was enough movement in WW2 that would make shrapnel useful. Or was it superseded by something else?
| AskHistorians | https://www.reddit.com/r/AskHistorians/comments/6h2afk/why_did_shrapnel_shells_fall_out_of_use/ | {
"a_id": [
"div44qd"
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"text": [
"Shrapnel shells were replaced with high-explosive shells. This was because high explosive shells were more versatile. Let me explain why.\n\n* High explosive shells did not lose lethality with long range and high trajectory as shrapnel shells di... | [] | [] | [
[
"http://www.winterwar.com/Weapons/gundata/artydrawings/fragcones.gif"
]
] | |
axfluv | How consistent is the earths' path every year? | Like is it always returning to the same exact spot? (relative to the solar system) | askscience | https://www.reddit.com/r/askscience/comments/axfluv/how_consistent_is_the_earths_path_every_year/ | {
"a_id": [
"ehuj6lp",
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"text": [
"Relative to the sun it almost always returns to the same sport however the orbit does turn with time meaning that the the highest part of the orbit and the lowest spin around the sun. You can see this over very long periods ... | [] | [] | [
[],
[
"http://www.pnas.org/content/early/2018/05/01/1800891115",
"https://academic.oup.com/gji/article/11/3/323/663422"
]
] | |
6ewk2z | what security does the us caller id system have and how could it be improved? | Logistically speaking, is there a way the US caller ID system could be effectively secured or are there technological or other non-policy hurdles in the way of a secured system? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/6ewk2z/eli5_what_security_does_the_us_caller_id_system/ | {
"a_id": [
"didmhcp"
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"score": [
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"text": [
"There is no security whatsoever. The ability to set your outgoing ID to any arbitrary number is an intended *feature* of the service. There are also redirect services that will trace back a *blocked* ID to reveal the actual number. Some of these ... | [] | [] | [
[]
] | |
28pzwk | how does peasant food become popular? | For example, lobster used to be given to prisoners. Why now, is it so coveted? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/28pzwk/eli5_how_does_peasant_food_become_popular/ | {
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"score": [
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"text": [
"People tend to like the things they grow up with, and the vast majority of the world is poor. So it's not very surprising that cheap, easy to cook food is the most popular, in gene... | [] | [] | [
[],
[],
[],
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] | |
3weie1 | I want to build a castle in England in the 13th Century...how do I go about doing it? | Provided I had the money and political power to do such a thing, how would my castle be built? Are there famous castle builders that I can hire? How would I finance such a large project? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/3weie1/i_want_to_build_a_castle_in_england_in_the_13th/ | {
"a_id": [
"cxw3drz"
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"score": [
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"text": [
"As you have alluded to, you would need an extraordinary amount of money to finance a castle during this period. For example: the average income of King Henry II was anywhere between £10-20,000 annually(not adjusted for inflation). To put this ... | [] | [] | [
[]
] | |
1w1epz | why is coffee so much more expensive than tea? | I don't just mean in cafés - gram for gram, coffee is easily twice the price of tea in a supermarket (and you get a lot more per gram out of tea than coffee, so the per-cup price difference is even greater). | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1w1epz/eli5_why_is_coffee_so_much_more_expensive_than_tea/ | {
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"score": [
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3,
2,
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"text": [
"Imagine how many grams of tea leaves are on a tea tree, vs how many grams of coffee beans are on a coffee tree. As... | [] | [] | [
[],
[],
[],
[],
[
"http://www.urbantea.com/collections/tea/black+loose-leaves"
],
[],
[]
] | |
cx0gdp | Democracy in Prewar Japan | How was the situation for democracy in pre WW2 Japan? Specifically did the Japanese people "want" democracy? I.e Were there any attempts to establish democracy and overturn the emperor/shogunate etc before Western intervention started? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/cx0gdp/democracy_in_prewar_japan/ | {
"a_id": [
"eyvg8th"
],
"score": [
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],
"text": [
"There totally was an attempt to establish democracy in the 1920s, but it was brief.\n\nJapan was not considered a true democracy when it established its constitutional monarchy in the 1850s. This is due to heavy poll taxes, making less than 5% of... | [] | [] | [
[]
] | |
47n46t | why is being pro-israel a republican stance? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/47n46t/eli5why_is_being_proisrael_a_republican_stance/ | {
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"text": [
"Israel is considered one of our only ideological allies in the Middle East. Republican foreign policy revolves around this area as it provides large amounts of oil (or did, US production has increased ... | [] | [] | [
[],
[],
[]
] | ||
1cxk9p | How can japanese Samurai and european Knights be compared? | Hello guys,
Lately I was wondering if there are any aspects that Samurai and Knights share. I'm not only interested in weaponary but also in social aspects and so on :)
Hoping for some nice answers, Thanks! | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1cxk9p/how_can_japanese_samurai_and_european_knights_be/ | {
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"Perhaps things like the grade of armour and how it has changed and been adapted over time in response to new techniques and technologies being discovered and subsequently advanced. Adaptation can also ... | [] | [] | [
[],
[],
[]
] | |
1wwedl | why do i have to drink so much water every day? | I want to get into a healthier diet and even downloaded some apps to track how much water I drink every day. I used to drink less than half of what I apparently have to although I'm rather active. What is going to be different? Thank you so much for answering! | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1wwedl/eli5_why_do_i_have_to_drink_so_much_water_every/ | {
"a_id": [
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"score": [
5,
3,
2
],
"text": [
"man cannot live on beer alone",
"You don't. There are a lot of urban myths and bad science relating to how much water you should drink. Much of this is a product of advertising by water and drinks c... | [] | [] | [
[],
[],
[]
] | |
1miw49 | what is c. wright mills' "sociological imagination"? | I need to write an essay about this topic but can't really grasp the idea. Thanks in advance. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1miw49/what_is_c_wright_mills_sociological_imagination/ | {
"a_id": [
"cc9svzd"
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"score": [
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"text": [
"**The Sociological Imagination**, put simply, is \"the ability to see the connection between personal troubles and social structures.\" (New Society, 6th Edition, 9)\n\nThe sociological imagination was born with the onset of three modern revoluti... | [] | [] | [
[
"http://en.wikipedia.org/wiki/Dei_gratia"
]
] | |
6kegpn | why does keeping food in the refrigerator make it last longer? | Why does keeping food cold make it last longer? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/6kegpn/eli5_why_does_keeping_food_in_the_refrigerator/ | {
"a_id": [
"djlfctg"
],
"score": [
4
],
"text": [
"It's harder for bacteria to survive and reproduce in extreme environments cold or hot, this is also why you fully cook chicken before eating it. "
]
} | [] | [] | [
[]
] | |
4z54pj | why does being scared open up super congested noses? | And is there any way to harness whatever causes that for chronic allergy sufferers?
(I'm on mobile and I can't access a computer so I can't flair yet. I'll do it in the morning.)
EDIT: flaired! | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4z54pj/eli5_why_does_being_scared_open_up_super/ | {
"a_id": [
"d6t08vh"
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"score": [
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"text": [
"Being Scared activates our fight-flight response. With the sympathetic nervous system activated it triggers the release of adrenaline(to run faster or fight back). This induces vasoconstriction of the blood vessels in the nose, throat, and parana... | [] | [] | [
[]
] | |
81ep24 | why do incandescent light bulbs have such a large volume compared to the tiny filament? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/81ep24/eli5_why_do_incandescent_light_bulbs_have_such_a/ | {
"a_id": [
"dv2m2yg",
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"score": [
3,
2,
2
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"text": [
"more surface area for cooling itself, less likely to burn you if you touch it. \n\nAlso, sizing of fixtures was defined decades ago, probably with a healthy dose of manufacturing capabilities driving t... | [] | [] | [
[],
[],
[]
] | ||
a1oe72 | why has internet speed been increasing since its founding? hasn't cable been the same speed since its founding? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/a1oe72/eli5_why_has_internet_speed_been_increasing_since/ | {
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"text": [
"The recent boost is due to fiber optic cables. Instead of travelling along bulky copper lines, signals are now basically sent as a beam of light down a fiber made of glass.\n\nThis allows much faster co... | [] | [] | [
[],
[],
[]
] | ||
37xwxr | can we speed up the rotation of the earth by putting rocketengines all over the equator ? ( in theory) | Inspired by a post from ksp.
EDIT: [This post](_URL_0_) | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/37xwxr/eli5_can_we_speed_up_the_rotation_of_the_earth_by/ | {
"a_id": [
"crqp0rv",
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"score": [
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2
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"text": [
"If there was no atmosphere, this would certainly be possible. \nAs it is, however, I believe that the thrust would simply be absorbed by the molecules in the air and no net change in momentum would be achieved. ",
"i th... | [] | [
"http://nl.reddit.com/r/KerbalSpaceProgram/comments/37v5ms/kerbins_rotational_speed_has_really_picked_up/"
] | [
[],
[]
] | |
zuavb | how does a neon light work? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/zuavb/eli5_how_does_a_neon_light_work/ | {
"a_id": [
"c67sdvs",
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2,
3,
3
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"text": [
"There's a tube with a mixture of gases in it. Two electrodes run a very high voltage (provided by a step-up transformer) through the tube, which excites the gas molecules and makes them emit light. The ... | [] | [] | [
[],
[
"http://www.youtube.com/watch?v=MjEK7RuunM8"
],
[]
] | ||
3ex7e4 | why everyone wants to kill the kurds? | hello reddit, my question is raised in light of Turkey joining the fight against ISIS. Turkey also started shelling the Kurds in Northern Iraq too. Which is to me like wanting to kick someone's ass then punching a guy who is already fighting your enemy? So basically the fight scene in Anchorman. Sadam, Turkey, Asad... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/3ex7e4/eli5why_everyone_wants_to_kill_the_kurds/ | {
"a_id": [
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"score": [
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2
],
"text": [
"Your analysis is wrong; Turkey want to kill the PKK who are a Marxist terrorist organisation that they have been fighting for decades - the essentially want their own state in eastern Turkey. On the other hand, Turkey are fa... | [] | [] | [
[],
[
"http://waitbutwhy.com/2014/09/muhammad-isis-iraqs-full-story.html"
]
] | |
32qm49 | how does glasses for crossed eye people work? | How do they work? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/32qm49/eli5_how_does_glasses_for_crossed_eye_people_work/ | {
"a_id": [
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"score": [
3
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"text": [
"Strabismus (cross-eyedness) comes in different forms, misaligned inward (esotropia), misaligned outward (exotropia), upward (hypertropia) or downward (hypotropia).\n\nExtreme cases cannot really be treated with optics and require surgery or visio... | [] | [] | [
[
"http://toddlerglasses.files.wordpress.com/2010/03/march10-481.jpg?w=600&h=400"
]
] | |
1jo5e3 | how come that electric trains work with a single overhead wire? | As far as my understanding goes, an electric curcuit needs to have a positive-pole and a negative pole in order to work. Seeing electric trains, I wonder where the first one is located, as conventional trains only have a single overhead wire for intake of electric current.
So my basic question is, as wikipedia & co ... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1jo5e3/eli5how_come_that_electric_trains_work_with_a/ | {
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"text": [
"The rails are the other pole.",
"Usually on such systems, the output runs through the rails. \n\nSo, AC comes in through the wire, activates the windings on the traction motors... | [] | [] | [
[],
[],
[],
[]
] | |
vu2et | - why a mac is called a mac and not a pc? other than os, what's the defining difference? | I've always thought PC stood for "Personal Computer". Isn't that what a Mac is? Other than OS they're exactly the same thing, with different hardware. I understand it's easier to tell the difference when discussing the two types of computers, but, what about any type of Linux system? they're called PC's also. different... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/vu2et/eli5_why_a_mac_is_called_a_mac_and_not_a_pc_other/ | {
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8,
3,
22,
283,
... | [] | [] | [
[],
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[],
[],
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"http://en.wikipedia.org/wiki/IBM_Personal_Computer",
"http://en.wikipedia.org/wiki/IBM_PC_compatible"
],
[],
[
"http://jeremyreimer.com/postman/node/329",
"http://en.wikipedia.org/wiki/Apple's_transition_to_Intel_processors"
],
[],
[],
[],
[],
[],
[],
... | |
16bvwb | How fast are we moving away from the recently observed galaxies 13+ billion light years away? | Recently, in a paper [in Nature](_URL_0_), the observation of galaxies 13+ billion light years away were observed. The light from these galaxies was thought to have been released when the universe was only 600 million years old. My question is simple, how is that possible, and how fast must we be traveling apart for ... | askscience | http://www.reddit.com/r/askscience/comments/16bvwb/how_fast_are_we_moving_away_from_the_recently/ | {
"a_id": [
"c7uls68",
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"score": [
8,
6
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"text": [
"This topic is not as easy as it seems.\n\nThe expansion of space does not \"count\" as objects moving away from each other, there is no upper bound on the rate at which space may expand, which sounds somewhat weird, but it h... | [] | [
"http://www.nature.com/news/galaxy-found-at-record-breaking-distance-1.12028"
] | [
[
"http://en.wikipedia.org/wiki/Metric_expansion_of_space"
],
[]
] | |
2v8cju | How close to the surface of the Earth does an airplane have to be to make a shadow? | My reasoning is that at cruising altitude the plane is both too small and too high for a definite shadow to appear somewhere below (assuming no clouds). | askscience | http://www.reddit.com/r/askscience/comments/2v8cju/how_close_to_the_surface_of_the_earth_does_an/ | {
"a_id": [
"cog2ytm"
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"score": [
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"text": [
"A \"definite shadow\" is kind of a vague term. I'd say a \"definite shadow\" happens when a certain point on the ground receives *zero* direct sunlight. \n\nThis is an easy calculation, but it depends entirely on the size of the airplane. You jus... | [] | [] | [
[
"http://www.wolframalpha.com/input/?i=distance+to+the+Sun+%2F+Sun+width"
]
] | |
46nsv2 | why isn't our sun and solar system slowly being sucked in to the black hole at the center of the milky way? | There's been some news about black hole discoveries recently, but we don't here much about the black hole in our own galaxy. What effect does it have on our solar system? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/46nsv2/eli5_why_isnt_our_sun_and_solar_system_slowly/ | {
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"text": [
"Black holes aren't the cosmic vacuums that some media has made them out to be.\n\nOnce you... | [] | [] | [
[],
[],
[],
[],
[],
[],
[],
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] | |
21o0lx | How close together are the stars near the center of our galaxy? | Would we be able to see other stars in the sky during the day if our solar system was closer to the center of the galaxy? | askscience | http://www.reddit.com/r/askscience/comments/21o0lx/how_close_together_are_the_stars_near_the_center/ | {
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69,
175,
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"text": [
"Short answer, yes! (with some assumptions)\n\nAccording to [these lecture slides](_URL_0_), the stellar dens... | [] | [] | [
[
"http://abyss.uoregon.edu/~js/ast122/lectures/lec26.html",
"http://en.wikipedia.org/wiki/Apparent_magnitude"
],
[
"http://www.astronomy.ohio-state.edu/~ryden/ast162_7/notes31.html"
],
[
"http://www.astro.ucla.edu/~ghezgroup/gc/pictures/orbitsMovie.shtml",
"http://i.imgur.com/RibFV9P.gi... | |
albl7p | why do people raise their heads when they say goodbye to each other? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/albl7p/eli5_why_do_people_raise_their_heads_when_they/ | {
"a_id": [
"efcjdg7"
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"score": [
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"text": [
"Raising your head is form of \"greeting\" it can also be used as a form of saying goodbye (similar to the itialian word ciao).\n\nNodding upwards exposes your throat, in the animal kingdom generally seen as a sign of trust.\n\nFun fact: ever noti... | [] | [] | [
[]
] | ||
2rggpf | is it better to pop a zit or let it go away itself? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2rggpf/eli5_is_it_better_to_pop_a_zit_or_let_it_go_away/ | {
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3,
5,
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"text": [
"Definitely better to leave it alone. If you pop it it'll most likely just get infected and could potential scar.",
"I always pop them and nothing happens, don't know what every... | [] | [] | [
[],
[],
[],
[]
] | ||
10mzwf | how do some animals know when we're sad? | I've noticed that if I'm upset or crying over something my cat or dog will come over an lick me or cuddle with me. Are they trying to make me feel better? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/10mzwf/eli5_how_do_some_animals_know_when_were_sad/ | {
"a_id": [
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"text": [
"I have a couple of theories.\n\nMy first thought, perhaps a bit harsh, is no. It is not aware that you are sad. Human beings have a tendency to believe things we want to believe. If we turn around and see someone behind our ... | [] | [] | [
[],
[
"http://www.psychologytoday.com/blog/my-puppy-my-self/201207/do-dogs-have-empathy-or-is-it-sixth-sense",
"http://www.psychologytoday.com/blog/canine-corner/201206/canine-empathy-your-dog-really-does-care-if-you-are-unhappy"
]
] | |
3rwg2v | Why is exponential decay/growth so common? What is so significant about the number e? | I keep seeing the number e and the exponence function pop up in my studies and was wondering why that is. | askscience | https://www.reddit.com/r/askscience/comments/3rwg2v/why_is_exponential_decaygrowth_so_common_what_is/ | {
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34,
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134,
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38,... | [] | [] | [
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[],
[],
[],
[],
[
"http://torus.math.uiuc.edu/eggmath/Expon/numbere.html"
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[],
[],
[],
[],
[
"http://chemwiki.ucdavis.edu/Physical_Chemistry/Kinetics/Reaction_Rates/First-Order_Reactions",... | |
3e46wx | How credible is Giorgio Vasari, many of his anecdotal stories regarding Michelangelo and Leonardo are fascinating, but I have no idea if they are accurate. | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/3e46wx/how_credible_is_giorgio_vasari_many_of_his/ | {
"a_id": [
"ctckbc8"
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"text": [
"Vasari was 8 when Leonardo died, so everything he wrote about him was second hand, sometimes derived from brief earlier bios and some interviews with Leonardo’s associates. He is a fairly good guide to L’s artwork. For example, he describes the e... | [] | [] | [
[]
] | ||
3gqbot | Would an astronaut fly into space or into earths atmosphere after pushing himself away from the ISS in direction to earth? | How would his orbit be modified from the push?
Of course assuming that he is not tied to the space station. | askscience | http://www.reddit.com/r/askscience/comments/3gqbot/would_an_astronaut_fly_into_space_or_into_earths/ | {
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"text": [
"By shoving off the ISS, she'd promote the station to a slightly higher orbit and herself to a slightly lower orbit. The orbital energies involved are much too higher for just a push to really change things.",
"No matter ... | [] | [] | [
[],
[]
] | |
sc3k1 | If an iceberg fell in the ocean, how big would it have to be to raise water level noticeable amount? | I'm talking about globally, maybe a few feet or something. Enough your average person could tell something was up. I'm pretty tired, and just thought about it. Sorry if it's worded weird. | askscience | http://www.reddit.com/r/askscience/comments/sc3k1/if_an_iceberg_fell_in_the_ocean_how_big_would_it/ | {
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"text": [
"[It would have to be so big, that it needs to be 5600x the size of the largest ship in the world to raise the water level by 1 mm.](_URL_0_)",
"If \"noticeable amount\" is three feet, then it would have to have a volume ... | [] | [] | [
[
"http://www.reddit.com/r/askscience/comments/s8e5u/given_that_ships_displace_water_wouldnt_the/c4bxu5m"
],
[]
] | |
vru4j | How did early man carry fire from one camp to the next? | I remember learning as a kid that early man would carry firebrands (embers) around in an animal horn or similar container with moss or some other type of slow burning fuel. And when they got to their next camp or needed a fire they would just put the still smoldering ember in some new tinder and blow on it till it cau... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/vru4j/how_did_early_man_carry_fire_from_one_camp_to_the/ | {
"a_id": [
"c57bc6v"
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"score": [
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"text": [
"That's funny. I've heard about this technique too, and I was going to come and mention it here - but I couldn't find a good article. But here's some wikipedia.\n\n_URL_0_"
]
} | [] | [] | [
[
"http://en.wikipedia.org/wiki/Firelighting"
]
] | |
5kqncf | Where did soldiers get their horses from in ancient Greece and Rome? How were so many horses made available? Were they captured as wild animals or were they bred for wartime purposes? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/5kqncf/where_did_soldiers_get_their_horses_from_in/ | {
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"text": [
"Not all horses are suitable for military use, and the Classical Greeks were well aware of this. They tended to select for particular characteristics depending on the role they intended for a horse. Race horses were very large, long, and sleek; wo... | [] | [] | [
[
"http://www.perseus.tufts.edu/hopper/text?doc=Perseus%3atext%3a1999.01.0210%3atext%3dHorse"
]
] | ||
38qq7y | why do people censor their eyes when they post pictures of themselves when you can still pretty much tell it's them if you knew the person originally? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/38qq7y/eli5_why_do_people_censor_their_eyes_when_they/ | {
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"There is a lot of facial detail in and around your eyes. If you know the person, then your brain will fill in the blanks and help you recognize them, but if you don't know the ... | [] | [] | [
[],
[],
[],
[]
] | ||
1n1xvw | Does Winston Churchill deserve his reputation as one of Britain's greatest leaders? | Churchill, seems to me, to have made several disastrous errors, that may have been forgiven (or forgotten) thanks to his charismatic nature. For example, Gallipoli and Norway were both flops, costing the many lives and wasting resources. Equally, he seems to have been highly imperialist, being vehemently opposed to rel... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1n1xvw/does_winston_churchill_deserve_his_reputation_as/ | {
"a_id": [
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"text": [
"Taking those pair of \"flops\" you mention, neither failed because of Churchill. At Gallipoli, his plan called for a fast, powerful naval assault on the narrows leading to Constantinople. The attack proceeded as per his o... | [] | [] | [
[],
[]
] | |
18hk01 | if images are just data that says what color each pixel should be on screen, then why are some bigger in size than others? | For example, if I generate a completely black image in photoshop with a resolution of 2048x2048, it will be a few kilobytes, whereas if I make a starfield in that image with the same resolution, it will be several megabytes. Why is one image larger in size than the other, even if they are the same resolution? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/18hk01/eli5_if_images_are_just_data_that_says_what_color/ | {
"a_id": [
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"text": [
"The program you use to make the program is able to compress the file slightly to make it take up less space. So instead of recording info for every single pixel, it stores information for a chunk of them that are all the sa... | [] | [] | [
[],
[]
] | |
32jl68 | how did t-rex sleep? | Like, I'm having trouble thinking of how in the world they would've slept. I mean, I can't really imagine spooning would've been too easy, so did they... Stand? Lean against a wall? Face plant and call it good til morning? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/32jl68/eli5_how_did_trex_sleep/ | {
"a_id": [
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"text": [
"Pretty much the same way [ostriches do](_URL_0_), like [this](_URL_1_).",
"T-Rex was basically a big bird, so it would have probably looked like a [chicken](_URL_0_) when sleeping."
]
} | [] | [] | [
[
"http://blogs.discovermagazine.com/notrocketscience/2011/08/25/ostriches-sleep-like-platypuses-and-look-wide-awake-when-they-do/#.VSzp1_nF8YE",
"http://i.imgur.com/worPkCd.jpg"
],
[
"http://thumbs.dreamstime.com/z/sleep-chicken-farm-as-close-up-34931349.jpg"
]
] | |
2mz4gn | why do dogs go crazy over red dots? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2mz4gn/eli5why_do_dogs_go_crazy_over_red_dots/ | {
"a_id": [
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12
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"text": [
"They don't. They go crazy over intense points of light.",
"Because instead of having to align a front and rear sight into a proper sight picture while maintaining cheek weld, they can simply shoulder the rifle and place... | [] | [] | [
[],
[]
] | ||
5u4ahy | why isn't 17th-19th century style classical music not composed anymore? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/5u4ahy/eli5_why_isnt_17th19th_century_style_classical/ | {
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"Composers of 20th/21st century classical music are always pushing the genre forward and looking to do something new. If they wrote something which was too close to the music of centuries ago, it would ... | [] | [] | [
[],
[
"https://en.wikipedia.org/wiki/Classical_music"
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3dmo2o | When will the first 'common' constellation visible from Earth have one of its stars die? | **EDIT: I should clarify that I mean when will *we* see it die?**
I was first thinking of Zodiacal constellations, but I know there are a lot more than these that people may consider 'common'. e.g. Orion, the Pleiades, navigational constellations, etc.
I was at a planetarium show a couple weeks ago, and during one se... | askscience | http://www.reddit.com/r/askscience/comments/3dmo2o/when_will_the_first_common_constellation_visible/ | {
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"text": [
"Assuming you mean a star within our own galaxy, it's impossible to predict, but it's very likely to be one of the constellations near the Milky Way (the cloudy band across the sky that we see looking into the plane of the galaxy). The massive sta... | [] | [] | [
[
"https://en.wikipedia.org/wiki/List_of_supernovae"
]
] | |
1his9a | When did the concept of "rent" arise? | Of course peasants would have to pay rent in cash or crops to their feudal lords, but what developments marked the beginning of "paying rent" in the modern sense? As a secondary question, what marked the beginning of the modern "apartment complex"? Did it arise directly from 19th century urban tenements or was there s... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1his9a/when_did_the_concept_of_rent_arise/ | {
"a_id": [
"cauyiwp"
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"score": [
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"text": [
"Some of the earliest written documents are lists of how much grain each person stored at the temple in Uruk. This might be construed as rent, but the religious componant behind these deposits is probably stronge... | [] | [] | [
[]
] | |
2qvpka | Explain the historical concept of the battlefield. | How did battlefields work, historically? Was the ancient battlefield a mutually agreed upon location, kind of like the modern playing field where contests were decided? I ask in regards to a statement I heard recently that stated how the modern battlefield has moved into urbanity. | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/2qvpka/explain_the_historical_concept_of_the_battlefield/ | {
"a_id": [
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"score": [
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"text": [
"This is a rather broad question that will get you pretty different answers based on the time period, geography, type of engagement and combatants.\n\nCould you narrow your question(s) to something more specific\n"
]
} | [] | [] | [
[]
] | |
bani72 | How does bacteria cause bleeding with a UTI (blood in urine)? Are they biting you? | How directly is the bleeding in a UTI caused by bacteria? Are they drawing blood directly from your ureter/bladder or are they causing irritation great enough to draw blood through some mechanism like a pH imbalance?
The reason I am asking is because I am picturing little bugs inside poking with something sharp to dr... | askscience | https://www.reddit.com/r/askscience/comments/bani72/how_does_bacteria_cause_bleeding_with_a_uti_blood/ | {
"a_id": [
"ekdrt24"
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"score": [
11
],
"text": [
"While the picture you painted is quite uncomfortable to think about, you were closer to the target with your earlier assumption. An infection in your bladder (or anywhere) increases blood flow across the lining of the bladder, just like a trauma... | [] | [] | [
[]
] | |
39xobi | Did Wellington and Nelson ever meet? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/39xobi/did_wellington_and_nelson_ever_meet/ | {
"a_id": [
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"text": [
"They met only once, briefly and by accident. They both happened to be in the waiting room of the Secretary for War, Lord Castlereagh, on 12th September, 1805.\n\nWellington described the meeting 30 years later. He said that at first they hadn't ... | [] | [] | [
[]
] | ||
1w1dmn | why do female voices in choirs stand out more? | In most cases when I listen to choral music that has men and women, it always seems the collective female voices *are* the choir more-or-less, and I often need to listen closely to even make out the men. Is it simply because the music was arranged this way? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1w1dmn/eli5why_do_female_voices_in_choirs_stand_out_more/ | {
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"text": [
"The way our hearing works, we notice higher tones more readily than lower tones. You'll notice with most music, the higher notes carry the melody and the lower notes provide rhythm and harmony. Since w... | [] | [] | [
[],
[],
[]
] | |
98kvna | Why do sleepers and rails from the railway track need to be removed and replaced with new ones? | askscience | https://www.reddit.com/r/askscience/comments/98kvna/why_do_sleepers_and_rails_from_the_railway_track/ | {
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"text": [
"On the other side of the pond, we call “sleepers” “railroad ties.” And even though railroad ties are soaked in a preservative such as creosote, they will degrade. As do the rails. Wear and tear, basica... | [] | [] | [
[],
[],
[
"https://www.railfreight.com/wp-content/uploads/2017/08/20170813-DSC08090-1-1024x683.jpg",
"https://i.pinimg.com/originals/58/5e/5f/585e5f3c6ddd9e8763fabc039a52d757.gif",
"https://www.railfreight.com/corridors/2017/08/23/railway-karlsruhe-basel-remains-closed-till-9th-of-october/"
]
] | ||
o524r | Does chewing gum have any health benefits? | askscience | http://www.reddit.com/r/askscience/comments/o524r/does_chewing_gum_have_any_health_benefits/ | {
"a_id": [
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"text": [
"Sugarless chewing gum increases saliva production, which is beneficial in preventing dental caries (aka cavities) because saliva helps inhibit the growth of the bacteria that causes them. Chewing gums that specifically contain xylitol carry addi... | [] | [] | [
[
"http://www.ncbi.nlm.nih.gov/pubmed/9479811",
"http://www.ncbi.nlm.nih.gov/pubmed/9586532"
]
] | ||
3078hn | why couldn't we have develop computers to understand human language rather than binary? | I know very little about programming and computers in general, so forgive me if this is a bit common sense which I never received. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/3078hn/eli5_why_couldnt_we_have_develop_computers_to/ | {
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"text": [
"Because the entire basis of binary is a physical property. The entire basis of electronic computing was the transistor. A transistor is like a see-saw; it's either on or off, on be... | [] | [] | [
[],
[],
[],
[]
] | |
2olndo | If scientists can detect gamma ray bursts happening all the time, how have we not been hit by one? | I'm watching a documentary on gamma ray bursts, and the narrator is talking about how often they occur. Then he says they can be detected from across the entire universe. That doesn't sound possible to me, could somebody more knowledgable than me shed some light on this subject? | askscience | http://www.reddit.com/r/askscience/comments/2olndo/if_scientists_can_detect_gamma_ray_bursts/ | {
"a_id": [
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"text": [
"In theory, we're hit by them all the time. That's how they're observed, as quick flashes of gamma rays coming from a single point in the sky. Of course, I should mention that they are observed by space telescopes designed to pick up these wavele... | [] | [] | [
[
"http://arxiv.org/abs/astro-ph/0309415",
"http://arxiv.org/abs/1409.2506"
]
] | |
5tkbwl | how did mankind learn to make (what we now consider easy) stuffy like bread and beer? | Did someone just stumble across somehow mixing the correct quantity of ingredients and then applying a correct amount of heat for an exact amount of time or was there the equivalent of scientists back in the day just trying to make stuff? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/5tkbwl/eli5how_did_mankind_learn_to_make_what_we_now/ | {
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"text": [
"Recorded history doesn't go back that far, so we just have to guess.\n\nFire goes back to homo habilis 100s of thousands of years ago. That's a lot of time. You have to expect ... | [] | [] | [
[],
[],
[],
[
"https://www.wired.com/2014/10/beer-yeast-attracts-fruit-flies/"
]
] | |
6ogzcz | How Affective Were Japanese Kamikaze Pilots? | During World War 2, how affective were the kamikazes as opposed to normal bombs? Were they more damaging for the most part? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/6ogzcz/how_affective_were_japanese_kamikaze_pilots/ | {
"a_id": [
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"text": [
"From [an earlier answer of mine](_URL_2_)\n\nWell, the hard reality was that by 1944, conventional air attacks had become *de facto* suicide attacks for most Japanese pilots attacking American naval task forces. For example, the Battle of the Phi... | [] | [] | [
[
"https://www.youtube.com/watch?v=2Zk3AZFJ4pU",
"https://www.youtube.com/watch?v=hziFBOx4yqc",
"https://www.reddit.com/r/AskHistorians/comments/4mw8sz/why_did_japan_use_so_many_kamikazes/"
]
] | |
1oid7h | Is there any good documentaries that you would recommend about the Iraq War? (Modern History) | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1oid7h/is_there_any_good_documentaries_that_you_would/ | {
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"text": [
"Unfortunately, we do not discuss events after 1993 in this sub. However, I can tell you that documentaries in general are not what historians would recommend, but rather books. \n\nEither way, I'd recommend going to /r/AskSocialScience to find th... | [] | [] | [
[]
] | ||
22s6lq | Why did Germany lose air supremacy during WWII? | RAF defended successfully Britain, why couldn't Luftwaffe do the same?
If I remember correctly what I read Germany was producing some 2,000 fighters/month at the peak of their military industrial production.
Was is that their planes were technically inferior? Was it the pilots training? Was it their strategy? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/22s6lq/why_did_germany_lose_air_supremacy_during_wwii/ | {
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"text": [
"The Germans simply did not have enough aviation fuel to train their pilots, and effectively defend their skies. Romanian crude oil was unsuitable for high-... | [] | [] | [
[],
[
"http://en.wikipedia.org/wiki/World_War_II_aircraft_production"
],
[],
[],
[
"http://www.amazon.com/Most-Dangerous-Enemy-Illustrated-History/dp/0760339368/ref=la_B001K86ER4_1_2?s=books&ie=UTF8&qid=1397237873&sr=1-2",
"http://www.historylearningsite.co.uk/battleofbritain.htm",... | |
93bsk1 | hydro power generation, why is there only one big turbine at the bottom of the hill and not multiple? the water should regain its kinetic energy? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/93bsk1/eli5_hydro_power_generation_why_is_there_only_one/ | {
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"score": [
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2,
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"text": [
"Most of the energy comes from the drop in height, from the top of the lake to the level of the turbine. That generates immense pressure. Once the water comes out of the turbine, that pressure is spent. ... | [] | [] | [
[],
[],
[
"https://en.wikipedia.org/wiki/Three_Gorges_Dam",
"https://en.wikipedia.org/wiki/Potential_energy"
]
] | ||
32x1e7 | If there is an infinite amount of numbers between 1 and 2, is there an infinite amount of time between 1 second and 2 seconds? | If you can divide up the distance between two numbers into an infinite amount of fractions, does that mean you can divide up a moment of time into infinite fractions of time, thus containing an eternity within a moment of time? | askscience | http://www.reddit.com/r/askscience/comments/32x1e7/if_there_is_an_infinite_amount_of_numbers_between/ | {
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"text": [
"If time is continuous you can say that there is an infinite amount of moments in a duration of one second. That doesn't mean there is an infinite amount of t... | [] | [] | [
[],
[],
[],
[],
[]
] | |
2gp81q | why does pressing in a x with your fingernail make a mosquito bite stop itching? | Also, I don't remember anyone teaching me this method, but everyone seems to know about it. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2gp81q/eli5_why_does_pressing_in_a_x_with_your/ | {
"a_id": [
"ckl9rip"
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"score": [
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"text": [
"I thought I was the only one that did this"
]
} | [] | [] | [
[]
] | |
1hezm6 | When and how did the tradition of awarding medals to soldiers begin? | Follow up question: Prior to this had there been other means of acknowledging special merit in an individual soldier? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1hezm6/when_and_how_did_the_tradition_of_awarding_medals/ | {
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],
"text": [
"Good question. As far back as the Romans there were ceremonial awards to soldiers for bravery, and I think Julius Caesar was awarded the Civic crown (made of Oak leaves) for bravery during a siege as a young man. This was on... | [] | [] | [
[],
[]
] | |
fcba8r | when we explore the ocean depths and find new species, we shine a light on them - if these animals live so far down in the dark and are used to pitch black, couldn’t the light harm them? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/fcba8r/eli5_when_we_explore_the_ocean_depths_and_find/ | {
"a_id": [
"fj9kqjb",
"fj9nq4y"
],
"score": [
2,
4
],
"text": [
"Creatures that live in absolute darkness tend not to have eyes, so they won't be dazzled by a bright light because they haven't evolved to see that light. \n\nSome do have light receptors, which are less complex than our ow... | [] | [] | [
[],
[]
] | ||
1hbwov | why are cd's still used for audio instead of dvd or blu-ray? | CDs work well at 16 bits per sample and a sample rate of 44.1 khz, but they can only hold up to (a little more than) 700 MB. Basic DVDs have 4.7 GB and basic blu-ray discs hole 25 GB. Why have neither of those been used for higher fidelity audio? Possibly 24 bits per sample at 192 khz? You could probably even fit more... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1hbwov/eli5_why_are_cds_still_used_for_audio_instead_of/ | {
"a_id": [
"castqdt",
"casv7x2",
"casx16z"
],
"score": [
18,
4,
5
],
"text": [
"There's a *massive* installed base of CD players. Look at all the home stereos and cars that would need to be upgraded.\n\nPeople were happy with 128kbps MP3s (worse than CD) when the iPod blew up. P... | [] | [] | [
[
"http://en.wikipedia.org/wiki/Super_Audio_CD"
],
[],
[]
] | |
53u8l6 | Were the Buddhist warrior-monks of Japan considered samurai? | In another thread on this subreddit, somebody said that the samurai in Japan were simply people who were legally permitted to carry weapons. But I've heard that there were sects of Buddhist warrior-monks called the sohei who carried weapons (they're awesome in Total War: Shogun 2). Were they categorized as samurai? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/53u8l6/were_the_buddhist_warriormonks_of_japan/ | {
"a_id": [
"d7x5jxq"
],
"score": [
2
],
"text": [
"The answer is...no...but yes?\n\nBefore the Edo period a samurai, was anyone who had arm(s) and armour(s), controlled a piece of land from which he could draw some income and maybe other people, and fought under the banner of one lord or another ... | [] | [] | [
[]
] | |
1e16az | Why can children have so much fun with make-believe compared to adults? | I've been thinking about this watching my own children play, and the absolute pure delight that they have doing things like chasing dinosaurs, eating/cooking pretend food, or just having stuffed animals fight each other. Why is this fun for them, and not adults? Is it just boredom, where we've already done that, so don... | askscience | http://www.reddit.com/r/askscience/comments/1e16az/why_can_children_have_so_much_fun_with/ | {
"a_id": [
"c9vz6f6",
"c9w4enl",
"c9w6j1z"
],
"score": [
12,
2,
2
],
"text": [
"So, first of all, you should definitely watch [Professor Alison Gopnik's Ted talk](_URL_0_). Basically, (in her words), kids are the R & D division of the human race; they are able to play, and explore... | [] | [] | [
[
"http://www.ted.com/talks/alison_gopnik_what_do_babies_think.html",
"http://scholar.berkeley.edu/carenwalker/files/walkergopnik_oxfordhandbook_2013.pdf"
],
[],
[]
] | |
1rz437 | why is it called beta-testing rather than alpha-testing? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1rz437/why_is_it_called_betatesting_rather_than/ | {
"a_id": [
"cdsc4wv",
"cdsc5za"
],
"score": [
6,
3
],
"text": [
"Alpha-testing is already done by the developer. \n\nBeta-testing is the second round, done by letting other people use it. ",
"Because alpha testing is already a thing. \n\nIt refers to testing by the company, a contract... | [] | [] | [
[],
[
"http://en.wikipedia.org/wiki/Software_testing#Alpha_testing"
]
] | ||
1n6d5u | Why would there be fish in a lake not connected to anything? | There is a lake near me in an abandoned quarry. It's at the top of a hill so nothing really flows into it and there aren't any rivers flowing out of it because it's just a big hole that's been dug into the granite. I was very confused then when I got closer and saw that the lake was full of little fish. How could they ... | askscience | http://www.reddit.com/r/askscience/comments/1n6d5u/why_would_there_be_fish_in_a_lake_not_connected/ | {
"a_id": [
"ccftj42",
"ccfu0yi",
"ccfwadk",
"ccg0g17"
],
"score": [
23,
16,
15,
7
],
"text": [
"Well considering fish don't spontaneously appear, it's only one of two options:\n\n1. They were put there at some point in the past\n\n2. A source of water that contained fish w... | [] | [] | [
[],
[
"http://news.sky.com/story/890154/killer-sharks-invade-golf-course-in-oz"
],
[],
[]
] | |
31f1s4 | How daunting was it living in the UK during 'The Troubles'? | This thread:
_URL_0_
got me curious about what life was like living in parts of the UK during 'The Troubles'. Were people nervous about going to work, taking the metro, going to large urban centers? Were troops marching down city streets? What could be compared to this time period that people may be familiar with in t... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/31f1s4/how_daunting_was_it_living_in_the_uk_during_the/ | {
"a_id": [
"cq14kqc"
],
"score": [
10
],
"text": [
"We have to distinguish Northern Ireland from the rest of the UK (which is called Britain). In Britain there were a number of atrocities which certainly terrified the local population, notably the bombings in Birmingham and Guildford in the ear... | [] | [
"http://www.reddit.com/r/HistoryPorn/comments/31duqa/a_british_paratrooper_takes_a_young_girl_in_his/"
] | [
[]
] |
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