q_id stringlengths 5 6 | title stringlengths 3 301 | selftext stringlengths 0 39.2k | document stringclasses 1
value | subreddit stringclasses 3
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1qeayl | Will We ever see a star die? is there anyway to tell or could one day a star just blink out. What are the chances? | I'm not very smart please don't ridicule me if i sound stupid | askscience | http://www.reddit.com/r/askscience/comments/1qeayl/will_we_ever_see_a_star_die_is_there_anyway_to/ | {
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"There are two typical ends to stars' lives:\n\n* Supernovas, where the star blows itself apart in a final cataclysmic explosion. We see these explosions (in other galaxies) every day with modern survey telescopes.\n\n* White dwarfs,, where, the ... | [] | [] | [
[]
] | |
4qhfvp | Why dont acls and meniscus heal on their own? | askscience | https://www.reddit.com/r/askscience/comments/4qhfvp/why_dont_acls_and_meniscus_heal_on_their_own/ | {
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" * Connective tissue in general (which includes tendons, ligaments, and cartilage) tends to have very poor blood supply; it consists mainly of fibers and fluids that give it its elasticity. So even if a ligament sustains only a minor injury, that... | [] | [] | [
[]
] | ||
1j08h3 | Working on writing a post-WWII film and had a question about surplus aircraft... | Hey all.
My questions center around surplus fighter/bomber aircraft after WWII: what exactly happened to the majority of them? Where were they kept (in the U.S., England, and other Allied countries) before being scrapped for raw materials? What happened to Axis aircraft? Were they taken home as war prizes or were they... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1j08h3/working_on_writing_a_postwwii_film_and_had_a/ | {
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"Many planes were lined up in what we might call a boneyard today and left to be sold for scrap or parts. One of the most popular things to do was to take the Allison engines from a P-38 or the Rolls Royce Merlin engine from ... | [] | [] | [
[
"http://i.imgur.com/QyYUZcM.jpg"
],
[]
] | |
2hy4bj | how can companies claim a light bulb has 22 years of lifetime, when it hasn't been around for 22 years? | For example, a new light bulb comes out from GE or Phillips, and they say "Lasts X years!" | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2hy4bj/eli5_how_can_companies_claim_a_light_bulb_has_22/ | {
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"Engineers can calculate the mean time before failure for devices, and it is based on the failure modes of the device, the known properties of what they made it out of, and other factors.\n\nThere are various formulas that ca... | [] | [] | [
[],
[]
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e6wn12 | Each decade of the 20th century is pretty easily distinguishable from one another in terms of fashion, cultural product, technology, and even social outlook. Were the decades of the 18th and 19th centuries equally as varied and self-contained? | At least in the global West, the distinctions between decades were dramatic, comparing for example the early 1910s to the late 1920s, or the 1950s to the 1960s. Massive changes occurred in short periods of time.
Did material and social changes cycle as rapidly in former centuries as well, or was this a byproduct of fa... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/e6wn12/each_decade_of_the_20th_century_is_pretty_easily/ | {
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"There's a major problem with the premise of your question, unfortunately.\n\n > Each decade of the 20th century is pretty easily distinguishable from one another ... the distinctions between decades were dramatic ...\n\nThis is a very common mis... | [] | [] | [
[
"https://www.rijksmuseum.nl/en/collection/RP-P-2009-3842",
"https://www.metmuseum.org/art/collection/search/341607",
"https://i.pinimg.com/originals/67/1c/04/671c040821633fe1c12b1eeb5f0d4ec9.jpg",
"https://www.metmuseum.org/art/collection/search/81464",
"https://metmuseum.org/art/collection/se... | |
1j5e10 | To what extent was there romantic and/or sexual intermingling between the British and their Indian subjects? | Did this occur? And if so, did it vary by region and era? Is there significant British ancestry in any part of India? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1j5e10/to_what_extent_was_there_romantic_andor_sexual/ | {
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"All my limited knowledge on this subject comes from *The Fishing Fleets* by Anne Courcy (which is a surprisingly good book on life in the British Raj), which exclusively deals with the higher social classes and their intera... | [] | [] | [
[],
[]
] | |
6kfmjd | How did laborers in the American South "beat the heat" before the invention of air conditioning? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/6kfmjd/how_did_laborers_in_the_american_south_beat_the/ | {
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"'Staying cool' is a question that [pops up now](_URL_1_) and [then](_URL_0_), but doing a scan through the old threads, I found it weird that we don't have any really solid threads which specifically deal with the American South! Well, fortunat... | [] | [] | [
[
"https://www.reddit.com/r/AskHistorians/comments/4tqh9s/i_am_a_french_noble_in_the_1700s_and_its_ever_so/d5jlfmu/",
"https://www.reddit.com/r/AskHistorians/comments/3r7j2z/did_early_modern_and_early_modern_womens_clothing/cwlqmrl/"
]
] | ||
4p2v00 | who has the most power in the u.s political system? | [deleted] | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4p2v00/eli5who_has_the_most_power_in_the_us_political/ | {
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"No group is suppose to have \"the most power\". Every branch is suppose to have counters and checks on the other two. \n\nPresident: Appoints Supreme Court Judges, Has Veto power o... | [] | [] | [
[],
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xi9ce | What was Spartan society like, specifically military training and strategies/fighting styles? | I was inspired by iSurvivedRuffneck's posts in the Roman Legionnaire thread, and he suggested starting a new thread. I find this stuff fascinating, so I'd love to learn more about it. | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/xi9ce/what_was_spartan_society_like_specifically/ | {
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"**Spartan society**\n\nThe people we know as Spartans were part of the Dorian settlers t... | [] | [] | [
[
"http://en.wikipedia.org/wiki/Helots",
"http://en.wikipedia.org/wiki/Phalanx_formation"
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"http://www.amazon.com/Gates-Fire-Novel-Battle-Thermopylae/dp/0553580531"
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[],
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"http://youtu.be/HMs9mema--Q?t=2m"
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7h2ns1 | how does different data traveling on the same cable not get lost with all the other data? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/7h2ns1/eli5_how_does_different_data_traveling_on_the/ | {
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"text": [
"Data is encapsulated into packets with headers and trailers that identify it. Sometimes it does get lost though.\n\nWhen 2 devices establish a connection, they decide on packet numbering. If I send you a packet that says ... | [] | [] | [
[],
[]
] | ||
520bh9 | how does square cash instantly send money to your card, where as a deposit or check from your company can take days? | Normal deposits and checks take days and have to be cleared, how does square cash do it? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/520bh9/eli5_how_does_square_cash_instantly_send_money_to/ | {
"a_id": [
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"score": [
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"text": [
"You're comparing two different cash methods. Payroll uses ACH (automated clearinghouse) transfers, while Square Cash uses the debit card network.\n\nSquare cash works by instantly debiting the sender's bank account, just like if they used their d... | [] | [] | [
[]
] | |
8ii8fy | Why Did The Saudi Throne Pass From Brother To Brother After The Death Of King Ibn Saud, And Where Did This Tradition Come From? | Most monarchies are hereditary from parent to child, however the Saudi Throne has passed from the children on Ibn Saud for the last 60 years, which will end with the ascension of Mohammed Bin Salman.
Why did the Saudi Monarchy embrace this method of inheritance? I read that this was a tradition in parts of the Middle... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/8ii8fy/why_did_the_saudi_throne_pass_from_brother_to/ | {
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"text": [
"I can't provide an answer as to why, where or when this practice originated. That being said, this tradition of succession can be observed throughout different historical periods in Arabia.\n\nAl\\-Walid I bin 'Abd al\\-Malik \\(d. 715 CE\\), was... | [] | [] | [
[]
] | |
5ssqni | why does protesting work? you see massive nationwide protests when there is civil unrest, but why can't the government just ignore it until the protestors give up? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/5ssqni/eli5_why_does_protesting_work_you_see_massive/ | {
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... | [] | [] | [
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8rbizq | How "tall" is the Milky Way? | I've read that it's 100,000+ light years across the "disk" of the Milky Way from edge to edge, but how "tall" or "thick" is it?
Are all the stars and planets/solar systems lined up, like our solar system, or Saturn's rings on an essentially flat plane? Or do stars and systems "stack" up on top of each other "verticall... | askscience | https://www.reddit.com/r/askscience/comments/8rbizq/how_tall_is_the_milky_way/ | {
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"The Milky Way disc has a \"thin disc\" of stars, about 1,000 light-years from top to bottom, which is most of the stars are. There's also a \"thick disc\" of stars that's more like 10,000 light-years in thickness, but it has fewer stars. It's th... | [] | [] | [
[]
] | |
9a0ydz | why and how is the feeling of attraction only triggered by certain people? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/9a0ydz/eli5_why_and_how_is_the_feeling_of_attraction/ | {
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"A big factor of attraction is immune system. Yes other things like sex appeal (gentics) matter but we are also attracted to healthy people.",
"One of the great mysteries of life. Still massively attracted to my wife afte... | [] | [] | [
[],
[]
] | ||
29hgay | Stars in earth rise picture? | So I know that in a picture of the earth there shouldn't be any stars visible since the earth is so bright we are unable to see them.
No I have cme across two vairiations of the famous Earth rise picture.
In [one there are no Stars](_URL_0_) like expected, but in the [other one there are some dots](_URL_1_) that could... | askscience | http://www.reddit.com/r/askscience/comments/29hgay/stars_in_earth_rise_picture/ | {
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"text": [
"The second picture looks like the contrast is brighter. Look how the features on the Earth are \"washed out\". If that is true, the higher contrast would bring out the stars that you otherwise couldn't see."
]
} | [] | [
"http://www.hq.nasa.gov/office/pao/History/alsj/a410/AS8-14-2383HR.jpg",
"http://www.nasa.gov/sites/default/files/images/297755main_GPN-2001-000009_full.jpg"
] | [
[]
] | |
2rdter | how is it that when our phone screens crack, the glass shatters but doesn't fall out? | SO brought this up recently, thought there might be an interesting answer. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2rdter/eli5_how_is_it_that_when_our_phone_screens_crack/ | {
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"Glass in phones is layered, with plastic inside. The glass shatters, but the plastic holds it together. \n\nAlso, car windshields do this as well.",
"In reality the \"glass\" is known as gorilla glass. Which is basically... | [] | [] | [
[],
[]
] | |
2wscy9 | What is the main building material for trees? | What element/compound do tree use to build themselves with? Obviously there are many substances used but what is the most important one? And would it be possible to genetically engineer a tree that uses something else? | askscience | http://www.reddit.com/r/askscience/comments/2wscy9/what_is_the_main_building_material_for_trees/ | {
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"Trees take carbon dioxide from the air and use it for fuel and to build themselves. All the carbon in a tree comes from carbon dioxide it absorbed from the air. Roots are used to take essential nutrients and water from the... | [] | [] | [
[
"http://en.wikipedia.org/wiki/Carbon-based_life"
],
[
"http://en.wikipedia.org/wiki/Plant_nutrition"
]
] | |
1jnewg | During the Greek war for independence, was a goal of the revolutionaries to retake Constantinople/Istanbul? If so, why did they not succeed? | I'm asking this because I couldn't find anything that explained why, and it always perplexed me.
Edit: And by retake I mean have it be part of Greece at the end of the war. | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1jnewg/during_the_greek_war_for_independence_was_a_goal/ | {
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"The Greek War of Independence was not a victory like triumphant professional armies entering the enemy capital. Much of the military success against the Ottomans happened because revolutionaries chose battlefields that limited the numerical super... | [] | [] | [
[]
] | |
1qg2fc | The hurricane that struck the Philippines was a "maximum" category 5. Is there really an upper limit to how strong a storm can be? | It does seem like the absolute most powerful storms have wind speeds right around 190 or so. What would it take to get one more powerful than that? Is there some factor that makes it impossible on Earth? | askscience | http://www.reddit.com/r/askscience/comments/1qg2fc/the_hurricane_that_struck_the_philippines_was_a/ | {
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" > Is there really an upper limit to how strong a storm can be? (self.askscience)\n\nSolar input vs. radiated heat combined with rate of heat transfer between the different components of the planet (ve... | [] | [] | [
[],
[],
[
"http://en.wikipedia.org/wiki/Saffir%E2%80%93Simpson_hurricane_wind_scale",
"http://en.wikipedia.org/wiki/Richter_magnitude_scale",
"http://en.wikipedia.org/wiki/Beaufort_scale",
"http://en.wikipedia.org/wiki/Saffir%E2%80%93Simpson_hurricane_wind_scale#Category_5"
]
] | |
3xmuj3 | those trance like moments where your mind thinks about nothing and you are staring into thin air | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/3xmuj3/eli5_those_trance_like_moments_where_your_mind/ | {
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"It's basically accidental mediation. I'm sure it can happen for many reasons leading up. If you find yourself moving on from whatever you were thinking about, but then never star... | [] | [] | [
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"https://en.wikipedia.org/wiki/Default_mode_network"
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] | ||
1ltv95 | why does it seem like people only get one disease at a time? | Is it possible for someone to have both a cold and the flu? Are viruses aware of each other?
Excluding genetic disorders. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1ltv95/eli5_why_does_it_seem_like_people_only_get_one/ | {
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"The immune system is activated and alert when you have one infection, so it makes it harder for another infection to develop. Disease states, such as cancer, diabetes, etc., may cause weakening of the immune system which often results in secondar... | [] | [] | [
[]
] | |
1p22pc | What in your study of history have you found especially moving or touching? | We're trying something new in /r/AskHistorians.
Readers here tend to like the open discussion threads and questions that allow a multitude of possible answers from people of all sorts of backgrounds and levels of expertise. The [most popular thread](_URL_1_) in this subreddit's history, for example, was about questio... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1p22pc/what_in_your_study_of_history_have_you_found/ | {
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1yn5nk | Compared to the vast the majority of colonies granted independence by Britain in the 20th century, how did Ireland so quickly become a prosperous 1st world country whereas many of the other former colonies are still 3rd or 2nd world nations? | First of all, I know 1st, 2nd, and 3rd world countries are outdated terms, but it's the best way I could convey what I was trying to ask.
Ireland's rise to economic success (we'll just ignore the recent recession for now) just seems out of line with that of a former British colony. Especially given that it was a small... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1yn5nk/compared_to_the_vast_the_majority_of_colonies/ | {
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"You are assuming that Ireland started at a similar economic baseline to other British colonies. This isn't the case. While average income in Ireland was lower than the UK, it was much, much higher than that of the average ... | [] | [] | [
[],
[]
] | |
1jz6uf | why do metronomes, when started at different times, sync up with each other? | Watching this video : _URL_0_
With my current understanding of music and time, I cannot comprehend how this is possible. How is it that these metronomes sync up if their purpose is to click at a constant? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1jz6uf/eli5why_do_metronomes_when_started_at_different/ | {
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"\"The energy transferred to the platform from each metronome starts out of sync, but the waveforms of the energy interfere with each other, and at the location of each metronome y... | [] | [
"http://www.youtube.com/watch?v=kqFc4wriBvE"
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[],
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3jerr1 | my electric shaver ran out of battery and stopped mid-shave. 10 minutes later, i tried it again and got a good 10-15 seconds in. what is happening? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/3jerr1/eli5_my_electric_shaver_ran_out_of_battery_and/ | {
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"The ions in the battery take some time to migrate through the medium in the battery: when you drain it, you're really just draining one part of it. The ions in the parts that aren't drained will diffuse back into the remainder, and will be availa... | [] | [] | [
[]
] | ||
6zgq94 | is it more fuel-efficient to drive a car fast so less total driving is involved and the engine runs for a shorter time or is it more fuel efficient to drive it slowly so the engine consumes less fuel? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/6zgq94/eli5_is_it_more_fuelefficient_to_drive_a_car_fast/ | {
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"Engines have an rpm efficiency range. No matter the speed you're going it's most efficient to run at a certain ... | [] | [] | [
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6upk3l | how / why do birth certificates get changed after adoption? (us) | ( I put US because that's where I live, and that's what I'm asking about. However, I would love to hear from people from other countries if this happens there also, because why not?)
Isn't your birth certificate supposed to be a recording of your birth? It says that you were born, when, and who gave birth to you. So, ... | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/6upk3l/eli5_how_why_do_birth_certificates_get_changed/ | {
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"Because, legally, those are the parents.\n\nA key reason to change the birth certificate is privacy. The birth parents are entitled to privacy when they give children for adoption. They may not want their birth children to track them down in late... | [] | [] | [
[]
] | |
5yzhj5 | how does a human cell work? | Or any cell, really. Ribosomes, Lysosomes, Golgi Apparatus and so on. I have no background in biology/biochemistry, so I really need a simple explanation of these things. Thanks! | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/5yzhj5/eli5_how_does_a_human_cell_work/ | {
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"I mean, you could take a semester long course on the functionality of different parts of a cell and how they work together to allow the cell to perform particular functions. \n\nUnless you have a more specific question, this... | [] | [] | [
[],
[]
] | |
2p696a | What exactly makes a person dead? | Why wouldn't it possible to bring back someone simply by pumping blood through their bodies? Can't we "restart" the brain? | askscience | http://www.reddit.com/r/askscience/comments/2p696a/what_exactly_makes_a_person_dead/ | {
"a_id": [
"cmunxic"
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"text": [
"The medical practice has, over time, changed with regards to determination of death. At one time, heart was considered to be the determinant of life or death; now, the brain is. The question of what makes a person dead frequently comes up in the ... | [] | [] | [
[
"http://www.donorrecovery.org/learn/understanding-brain-death/"
]
] | |
54l4t5 | why don't spiderwebs seem to decay over time? | A few days earlier I noticed, that inside an old barn we played in as kids, a spiderweb is still there, which I recognized for its interesting spot.
It has collected more dust over the years - yet it is still there. What is the reason for that?
| explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/54l4t5/eli5_why_dont_spiderwebs_seem_to_decay_over_time/ | {
"a_id": [
"d83rxdw"
],
"score": [
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"text": [
"They do just very very slowly. We know it decomposes because it is organic. It degrades at a slow rate because of the proteins it is made of to create a very strong web with (relatively speaking) high tensile strength."
]
} | [] | [] | [
[]
] | |
2x6wpx | why do adhd medications(schedule 2 controlled substances) take forever to fill? | I was happy today upon receiving my prescription for concerta as my previous medication did not work. i go to the pharmacy and they say it will take days for it to be approved because of the DEA or some shit | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2x6wpx/eli5_why_do_adhd_medicationsschedule_2_controlled/ | {
"a_id": [
"coxg89y",
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"score": [
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2
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"text": [
"Some of the drugs are potentially drugs of abuse. So there's extra checks.\n\nSchedule 2, the designation used for substances that have a recognized medical value but present a high potential for abuse.",
"Depending on w... | [] | [] | [
[],
[]
] | |
8pl2s4 | What is the difference between the six types of quarks? | I know that there are 6 different types of quarks (up, down, charm, etc.) But what exactly is the difference between them? How was it determined which combinations make up protons, neutrons, and so on? On a side note, are they small enough to be considered on the Planck scale? By throwing h = E in Einstein's E=mc^2, m=... | askscience | https://www.reddit.com/r/askscience/comments/8pl2s4/what_is_the_difference_between_the_six_types_of/ | {
"a_id": [
"e0c3bew",
"e0c8990",
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"score": [
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7,
3
],
"text": [
"There are three \"generations\" of increasing size, and in each generation there is a quark with 2/3 the charge of a proton and another with 1/3 the charge of an electron. The first generation is up/do... | [] | [] | [
[],
[],
[]
] | |
ad4cah | did someone ever bring up to the founding fathers the hypocrisy of writing “with liberty and justice for all” and “all men are created equal” while having slaves? what was their response? how did they justify it? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/ad4cah/did_someone_ever_bring_up_to_the_founding_fathers/ | {
"a_id": [
"eddxoza",
"edgce5o"
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"score": [
144,
6
],
"text": [
"It is important to look past the racist myth that black people were not considered human by many people. The founders did not simply have a moral/metaphysical view whereby it was immediately apparent that black people had ... | [] | [] | [
[],
[
"https://www.youtube.com/watch?v=AOZXYfpuWDs"
]
] | ||
bwojm3 | Why is there a sudden spike in the use of “bruh” in 1850? | If you google it, there’s a significant spike around 1850, compared to modern day. Why is this? Where old timey folk going around calling each other “bruh?” | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/bwojm3/why_is_there_a_sudden_spike_in_the_use_of_bruh_in/ | {
"a_id": [
"epz0wow"
],
"score": [
146
],
"text": [
"At the bottom of every Google Ngrams result, you can see that it breaks the hits down by year ranges. If you click them, [it'll show you what's causing the hits](_URL_0_). In this case, there was a book in 1851 that categorized the animals of t... | [] | [] | [
[
"https://www.google.com/search?q=%22bruh%22&tbm=bks&tbs=cdr:1,cd_min:1839,cd_max:1898&lr=lang_en"
]
] | |
42abjm | Why was the punishment of "Nine Familial Exterminations" used often as a systemic punishment in China, but not anywhere else? | I'm currently zipping through a Chinese history podcast, and the striking thing is how often palace coups or failed rebellions would lead to the execution of the losers' entire clan. I understand *why* it was done, what I don't understand is why it seems to be a practice peculiar to Chinese civilization.
I'm sure othe... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/42abjm/why_was_the_punishment_of_nine_familial/ | {
"a_id": [
"cz8wyrn"
],
"score": [
14
],
"text": [
"It's guilt by association. \n\nFirst, Chinese society was organized along the lines of filial piety - unfilial acts towards parents and/or elder family members or the killing of parents and/or family elders was one of the \"Ten Great Crimes\" an... | [] | [] | [
[]
] | |
44lq3z | how do different breeds of cats and dogs have distinct temperaments, when they're more or less of the same breed? | How come it's so easy (and often accurate) to say something like "Oh, Pomeranians are feisty and often challenge bigger dogs" or "Ragdolls are pretty sweet cats that can be very curious"?
Is behavior in cats and dogs innate, and how do they differ by breed?
You can't really describe humans or many other animals in th... | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/44lq3z/eli5_how_do_different_breeds_of_cats_and_dogs/ | {
"a_id": [
"czr2wml",
"czr2yyi"
],
"score": [
6,
2
],
"text": [
"IMO it's more of a generalization. I had a pit bull that thought she was a lap dog, gentle as could be.\n\nThe same could go for humans. Irish are drunks, Asians can't drive, English have terrible teeth. We don't all fit the... | [] | [] | [
[],
[]
] | |
28gin6 | how do catalysts affect the rate of a reaction without being changed by the reaction? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/28gin6/eli5_how_do_catalysts_affect_the_rate_of_a/ | {
"a_id": [
"cib0sqp"
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"score": [
3
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"text": [
"Yay a catalysis question! (I'm doing a PhD in this field)\n\n\nThere are many different types of catalysts, so the answer depends on what we are talking about.\n\n\nFor instance, in an acid-catalyzed reaction, the acid molecule (or acid group of... | [] | [] | [
[]
] | ||
8acmc9 | How did the Finnish soldiers withstand the cold during the winter war? | Did they have special equipment? drugs? was it genetics?
I can't find much about the Finnish soldiers besides the fact that they built saunas everywhere. that can't be the only thing, though. could it? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/8acmc9/how_did_the_finnish_soldiers_withstand_the_cold/ | {
"a_id": [
"dwya88x",
"dwyj821"
],
"score": [
7,
30
],
"text": [
"While you're waiting, check out this answer on the equipment of the Finnish troops:\n\n[I am a Finnish soldier in 1939/40, What would I have in my roughsack?](_URL_0_) by /u/Holokyn-kolokyn and /u/Elm11",
"Survival in t... | [] | [] | [
[
"https://www.reddit.com/r/AskHistorians/comments/3lop7m/i_am_a_finnish_soldier_in_193940_what_would_i/"
],
[
"https://upload.wikimedia.org/wikipedia/commons/a/a2/Halvplutonst%C3%A4lt.jpg"
]
] | |
635jap | clipping in video games. we've basically photorealistic graphic quality in some newer games, but moving objects still clip through walls like it's 2000. why isn't that manageable? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/635jap/eli5_clipping_in_video_games_weve_basically/ | {
"a_id": [
"dfri4g4"
],
"score": [
4
],
"text": [
"Calculating per vertex intersection is expensive.\n\nA model is made up of vertex points. A position in 3D space. Drawing lines between these points creates a model.\n\nTo calculate if a vertex intersects another vertex is expensive (in CPU terms... | [] | [] | [
[]
] | ||
3usvd0 | how can this 1000w industrial laser blast rust off steel but not burn the operator's hand? | [The laser](_URL_0_) | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/3usvd0/eli5_how_can_this_1000w_industrial_laser_blast/ | {
"a_id": [
"cxhkqmd",
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"score": [
1642,
55,
4,
18,
16,
87,
4,
17,
10,
13,... | [] | [
"https://youtu.be/NSBGVhzGVxY"
] | [
[
"https://www.reddit.com/r/holdmybeaker/comments/31ni5f/hmb_while_i_use_this_1000w_burning_laser_to/"
],
[
"http://www.cleanlaser.de/wEnglish/produkte/high-power-cl-1000.php",
"http://www.adapt-laser.com/ourapplications.php?id=2",
"https://en.wikipedia.org/wiki/Laser_ablation"
],
[],
[],
... | |
3qsjw9 | why is there a wave passing through the tv when seen through a camera? | I was recording the "divine intervention" scene in Pulp Fiction for a friend. And all of a sudden i noticed Jules' nose move up and down in a pattern! | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/3qsjw9/eli5_why_is_there_a_wave_passing_through_the_tv/ | {
"a_id": [
"cwhzcql"
],
"score": [
3
],
"text": [
"It's hard to tell from this story, but I suspect that this is actually pretty complicated. I suspect it's the combination of 2 factors:\n\n1: the video is being painted on the screen line-by-line. In fact, if the video is interlaced, it's paintin... | [] | [] | [
[
"https://www.youtube.com/watch?v=CmjeCchGRQo"
]
] | |
44mm6y | In medieval warfare, were there officers or delegated leaders on the battlefield outside of the nobles responsible for levying and leading armies? | [deleted] | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/44mm6y/in_medieval_warfare_were_there_officers_or/ | {
"a_id": [
"czra9y8"
],
"score": [
16
],
"text": [
"Yes, there were, but it's not always clear how they carried out commands or who exactly they were. Check out [this](_URL_0_) previous comment I made about the military officers of Edward I. Unfortunately, we can't say for sure whether this syste... | [] | [] | [
[
"https://www.reddit.com/r/AskHistorians/comments/1e0e8c/whenhow_did_militaries_go_from_being_led_by/c9vm39n"
]
] | |
51msfj | Do individual moving charges create a magnetic field? | Relativity explains the forces between two current-carrying wires in terms of relativistic length contraction, but what about two electrons next to each other? In their rest frame, there is only the electrostatic force, but for observers moving relative to the charges, there would be the additional lorentz forces. This... | askscience | https://www.reddit.com/r/askscience/comments/51msfj/do_individual_moving_charges_create_a_magnetic/ | {
"a_id": [
"d7dbg5j"
],
"score": [
7
],
"text": [
"An individual moving charge *does* produce a magnetic field. For a point charge moving arbitrarily, the potentials and fields are given [here](_URL_0_)."
]
} | [] | [] | [
[
"https://en.wikipedia.org/wiki/Liénard–Wiechert_potential#Corresponding_values_of_electric_and_magnetic_fields"
]
] | |
4xmo9g | why do a lot of middle-eastern muslim women seem to hate burqas (burn them when they can) yet still choose to wear hijabs/niqabs/chadors? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4xmo9g/eli5_why_do_a_lot_of_middleeastern_muslim_women/ | {
"a_id": [
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"d6gpztj",
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"score": [
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2,
10,
3
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"text": [
"Imagine if a bunch of dudes rolled into your town with guns, shot everyone in charge, beheaded a few people, and then made everyone else dress like it was 1600AD. Men to wear bri... | [] | [] | [
[],
[],
[],
[]
] | ||
apaw77 | When and how did sexual lyrics become accepted in mainstream music? | [deleted] | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/apaw77/when_and_how_did_sexual_lyrics_become_accepted_in/ | {
"a_id": [
"eg7p6pq"
],
"score": [
4
],
"text": [
"Sexual and taboo topics have always been a part of music. The lyrics are there, but you just aren’t picking up on all the slang and innuendo because you’re listening with modern ears.\n\nIn “Minnie the Moocher” Cab Calloway sings about a woman wh... | [] | [] | [
[]
] | |
1go79m | When the bourgeois and proletariat were fighting, did they call themselves that, and what did they point at in history to sway arguments? | What philosophies or arguments did they use during the French Revolution? Did they call themselves bourgeois and proletariat? What do those terms mean? What did they point at in history as an example of what was going on? Feudal systems? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1go79m/when_the_bourgeois_and_proletariat_were_fighting/ | {
"a_id": [
"cam8voy"
],
"score": [
5
],
"text": [
"A fight between the Bourgeois and Proletariat is primarily associated with Marxist philosophy. This didn't really occur during the French revolution. In the traditional Marxist historiographical view, the French revolution was primarily a fight b... | [] | [] | [
[]
] | |
9m2qbw | How do Müller glial cells in the retina help 'channel' photons through the retina to the photoreceptors? | I've been told that their conic shape can funnel light into the rods/cones, but how does that actually work? Why wouldn't the photons just get absorbed by its intracellular components, or those of the other retinal cells anterior to the photoreceptors? | askscience | https://www.reddit.com/r/askscience/comments/9m2qbw/how_do_müller_glial_cells_in_the_retina_help/ | {
"a_id": [
"e7dcg8d"
],
"score": [
2
],
"text": [
"(\"Muller cells are living optical fibers in the vertebrate retina.\") _URL_0_\n\n\" Müller cells have an extended funnel shape, a higher refractive index than their surrounding tissue, and are oriented along the direction of light propagation\"\... | [] | [] | [
[
"https://www.ncbi.nlm.nih.gov/pubmed/17485670/"
]
] | |
46qod9 | If I switch a bulb from a 65W incandescent to a 7W led, where are those extra watts going? | Hey there. Kind of a newb to electricity. I've been looking it up a lot, just so I understand it I realize volts are like the "pressure" of the electricity and amps are like the "volume" of electricity coming through. Here's what I don't get. A light bulb can power both a 65W bulb and 7W bulb, and the lesser bulb does... | askscience | https://www.reddit.com/r/askscience/comments/46qod9/if_i_switch_a_bulb_from_a_65w_incandescent_to_a/ | {
"a_id": [
"d07ff24",
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"d07g77h",
"d07hgmj",
"d07uidh"
],
"score": [
3,
6,
18,
4,
2
],
"text": [
"The excess is not used. Your household electricity has the potential to service (I am assuming 120v +/-) and 50, 100 or 200 amps (probably). Because you have... | [] | [] | [
[],
[],
[],
[],
[]
] | |
lncu1 | What effects on our biology has wearing clothes for thousands of years produced (if any)? | We're not born wearing clothes, obviously, but a vast majority of people wear clothes for their entire lives. Has this influenced the way our body manages its temperature, hair growth, or anything else? Does it predispose us to having a lesser ability to survive in harsher climates? Or does it not give any influence at... | askscience | http://www.reddit.com/r/askscience/comments/lncu1/what_effects_on_our_biology_has_wearing_clothes/ | {
"a_id": [
"c2u4mn9",
"c2u4ucu",
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"c2u58gq",
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"score": [
15,
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"text": [
"I too would like to know this. Because i... | [] | [] | [
[],
[],
[
"http://anthro.palomar.edu/homo2/mod_homo_5.htm",
"http://www.impactlab.net/2011/01/07/lice-dna-study-shows-humans-first-wore-clothes-170000-years-ago/"
],
[
"http://www.sciencedaily.com/releases/2011/01/110106164616.htm"
],
[
"http://www.runningbarefootisbad.com/another-study/... | |
86lvyj | why are sports injuries allowed to be reported in detail | How does that not violate HIPAA law? And if it does, does no one care? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/86lvyj/eli5_why_are_sports_injuries_allowed_to_be/ | {
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3,
2
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"text": [
" > How does that not violate HIPAA law?\n\nHIPAA would prevent a doctor from just handing out detailed information on the injury of a patient, sports icon o... | [] | [] | [
[],
[],
[],
[],
[]
] | |
11bf1h | So if the universe is expanding, where's all that matter coming from? Or am I thinking about this in the entirely wrong way? | I don't have much experience with physics, but this question occurred to me today and I couldn't think of a better place to ask it. So, its common knowledge that the universe is expanding at an accelerating rate, that galaxies are getting farther a farther away from each other, etc..My question is, what takes up all th... | askscience | http://www.reddit.com/r/askscience/comments/11bf1h/so_if_the_universe_is_expanding_wheres_all_that/ | {
"a_id": [
"c6l00ds",
"c6l1wyw"
],
"score": [
16,
2
],
"text": [
"There isn't any new matter -- you're thinking about it in entirely the wrong way.\n\n > what takes up all that expansionary space?\n\nNothing. At best, the only thing that can be argued is that there is more dark energy i... | [] | [] | [
[
"http://en.wikipedia.org/wiki/Big_rip"
],
[]
] | |
6hb9kv | why is drinking hot water good for us when we're sick? is it good for us even when we're not sick? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/6hb9kv/eli5_why_is_drinking_hot_water_good_for_us_when/ | {
"a_id": [
"diwz03b",
"diwz0br"
],
"score": [
4,
5
],
"text": [
"Is drinking hot water when youre sick a thing? Never heard this before.",
"The warmth can help with the feeling of chills, and the steam can open your sinuses and allow you to breathe a little better. Nutritionally, it ... | [] | [] | [
[],
[]
] | ||
wgofv | Can water freeze under tremendous pressure, like at the bottom of the ocean? | Why isn't the water at the bottom of the ocean frozen? | askscience | http://www.reddit.com/r/askscience/comments/wgofv/can_water_freeze_under_tremendous_pressure_like/ | {
"a_id": [
"c5d5ndw",
"c5d5ogt",
"c5dbfnw",
"c5dc1mj"
],
"score": [
26,
13,
2,
3
],
"text": [
"The pressure at the bottom of the ocean isn't high enough, but yes, water will change to ice if you increase the pressure sufficiently. It's not the same phase as the ice you're ... | [] | [] | [
[
"https://en.wikipedia.org/wiki/Ice#Phases",
"https://en.wikipedia.org/wiki/Mariana_trench"
],
[
"http://en.wikipedia.org/wiki/Mariana_Trench",
"http://upload.wikimedia.org/wikipedia/commons/0/08/Phase_diagram_of_water.svg"
],
[],
[
"http://en.m.wikipedia.org/wiki/Gliese_436_b#section... | |
9qqgzf | how does collegiate recruiting work? | Take football for example there 1,050,000 high school football players in the US. How can scouts and collegiate coaches possibly see all of them or know where to go to see who is good or bad? Not to mention even good players have bad games, how are the million players vetted? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/9qqgzf/eli5how_does_collegiate_recruiting_work/ | {
"a_id": [
"e8ays8t"
],
"score": [
5
],
"text": [
"You don't need to vet a million players, nor see all of them. There is a weird misconception that talent is uncommon, and this applies to either sports, or general recruitment. \n\nIf there are 1 million players, and you only want to take the bes... | [] | [] | [
[]
] | |
4voraj | Where can I read the full translated writings of Ahmad Ibn Fadlan? | The only thing I can find is the small excerpts about the Vikings and Rus but did he write more about his travels?
I'm really interested in reading about his entire travel through europe from start to finish.
| AskHistorians | https://www.reddit.com/r/AskHistorians/comments/4voraj/where_can_i_read_the_full_translated_writings_of/ | {
"a_id": [
"d6089a9"
],
"score": [
6
],
"text": [
"I assume you're interested in ibn Fadlan's *Risala*, which chronicles his full journey and deals with the Vikings as well as their home society (Rus was the term they used to describe people whose identity is not yet 100% agreed upon--might have ... | [] | [] | [
[
"https://www.library.cornell.edu/colldev/mideast/montgo1.pdf",
"http://www.markuswiener.com/books/ibn-fadlans-journey-to-russia-a-tenth-century-traveler-from-baghdad-to-the-volga-river/",
"http://www.indiana.edu/~cahist/course1.html"
]
] | |
ajevyu | why is it safe for babies to sleep on their back when they are always spitting up when if an adult passes out drunk its safer to roll them on their side to prevent choking | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/ajevyu/eli5_why_is_it_safe_for_babies_to_sleep_on_their/ | {
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"score": [
16,
233,
81,
9,
4,
42,
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9
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"text": [
"An infant will have a hard time lying on his/her side. They just roll around.\n\nA slee... | [] | [] | [
[],
[],
[],
[],
[],
[
"https://www.healthychildren.org/English/ages-stages/baby/sleep/Pages/Sleep-Position-Why-Back-is-Best.aspx"
],
[],
[]
] | ||
1xi4qp | Do we know how popular or common oral sex all across the history of premodern Europe and the Islamic World? | I know the Romans found female-on-male oral sex disgusting, but what about other cultures, contemporary or later? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1xi4qp/do_we_know_how_popular_or_common_oral_sex_all/ | {
"a_id": [
"cfbo6ar",
"cfbpv1t",
"cfc1e0p"
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"score": [
29,
15,
12
],
"text": [
"During the Medieval Islamic period, it was considered disgusting as well. In a book by Hunayn ibn Ishaq (A Christian scholar from the Abbasid period) who translated the Greek works of Artemidorus on ... | [] | [] | [
[],
[],
[
"http://www.reddit.com/r/AskHistorians/comments/u66i8/i_have_a_possibly_prurient_and_somewhat_unusual/c4sqekz",
"http://www.jstor.org/stable/2651412"
]
] | |
3fvocv | You have a cup of lemonade. Drink half the cup, then fill it back up with water; repeat n times. Will the cup ever be filled with just water? | askscience | http://www.reddit.com/r/askscience/comments/3fvocv/you_have_a_cup_of_lemonade_drink_half_the_cup/ | {
"a_id": [
"ctsf4qj",
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"text": [
"EPA states that tap water has no more than 500 ppm of impurities. Say, for sake of conservatism, you start with not lemonade but pure, dehydrated, lemonade concentrate. So that's 1,000,000 ppm \"impure\". That gives us the ... | [] | [] | [
[],
[]
] | ||
z11rt | How far are we from genetically engineering fruits or vegetables with new tastes and textures? | Hi all,
As far as I know, the genetic engineering that has been done until now has mainly been focused on increasing the yields of plants (better resistance to insects or draught, etc...). I've never heard of modifications that modified the taste.
We don't think about it very often given how common those ingredients ... | askscience | http://www.reddit.com/r/askscience/comments/z11rt/how_far_are_we_from_genetically_engineering/ | {
"a_id": [
"c60qs63"
],
"score": [
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"text": [
"It can be done in theory, but in practice it would be a bit difficult. Right now the traits inserted into GE crops are usually the result of only a single protein: cry proteins for insect resistance, cspB for drought tolerance, the c4 epsps or p... | [] | [] | [
[]
] | |
2v3q0j | How are nuclear weapons safely detonated underground to contain fallout? What would one of the underground sites look like, before and after the explosion? | askscience | http://www.reddit.com/r/askscience/comments/2v3q0j/how_are_nuclear_weapons_safely_detonated/ | {
"a_id": [
"coeqomg"
],
"score": [
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"text": [
" > How are nuclear weapons safely detonated underground to contain fallout?\n\n\nReally just an issue of containing the force of the blast. Because there's no good way to contain the super-heated gas in addition to the concussive force of the bla... | [] | [] | [
[
"http://www.soap.com.au/underground/crater_3_underground_explosion.jpg"
]
] | ||
8j2xjf | how nascar races work ? | Normally race tracks have corners, turns etc
So the best driver wins
But how does it work in nascar races where the tracks are simply oval ?
I dont see how anything else matters other than car's performance ..
| explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/8j2xjf/eli5_how_nascar_races_work/ | {
"a_id": [
"dywip7e",
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"score": [
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4
],
"text": [
"Cup cars in NASCAR are driven right at the absolute limits of their mechanics and aerodynamics. It takes a lot of skill just to stay on a decent racing line on the track. Competing with 40 other cars, at nearly 200mph, with... | [] | [] | [
[],
[]
] | |
arxpsc | There is a recent controversy between Israel and Poland regarding Polish collaboration with the Nazis. To what extent did the Poles collaborate with the Nazis, and how widespread was it compared to other German-occupied countries? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/arxpsc/there_is_a_recent_controversy_between_israel_and/ | {
"a_id": [
"egqfbzq"
],
"score": [
9
],
"text": [
"Hi there, not to discourage further discussion, but you might be interested in looking at /u/commiespaceinvader's answer [here](_URL_0_) and the answers they link within about the extent of Polish collaboration with the Nazis."
]
} | [] | [] | [
[
"https://old.reddit.com/r/AskHistorians/comments/7wflgu/germandeathcamps_ad_campaign_how_accurate_is_it/"
]
] | ||
40vcjx | What generally happened when two opposing shield walls engaged each other on the battlefield? | [deleted] | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/40vcjx/what_generally_happened_when_two_opposing_shield/ | {
"a_id": [
"cyxqtrr"
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"score": [
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"text": [
"I can only answer this for Ancient Greece, so bear in mind that the story may be very different for other cultures that used closely packed infantry formations (it sounds like you've been watching The Last Kingdom, which takes place over a thousa... | [] | [] | [
[]
] | |
1pl1ub | why after 7 iphone launches apple still can't properly supply the demand | I went to the apple store yesterday to pick up the new iPhone 5s for my mom and they told me they were still sold out. Why is it that after so many launches there's still a shortage issue? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1pl1ub/eli5_why_after_7_iphone_launches_apple_still_cant/ | {
"a_id": [
"cd3e5lj",
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"score": [
3,
2,
2
],
"text": [
"It could be for a few reasons. It could be either that they are having a shortage of one of the components used in the phone, they want to release the phone as soon as they can so they don't have enough... | [] | [] | [
[],
[],
[]
] | |
2pzjq4 | where does the air come from in microwave popcorn? | So you start out with a sealed bag of microwave popcorn, but when finished it's inflated with both air and popcorn. Where does the air come from? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2pzjq4/eli5_where_does_the_air_come_from_in_microwave/ | {
"a_id": [
"cn1ewpp"
],
"score": [
3
],
"text": [
"The air comes from the environment. Paper bags aren't airtight, which is why microwave popcorn bags typically come wrapped in plastic."
]
} | [] | [] | [
[]
] | |
92pem9 | How is vocal pitch determined? | Is it genetic, environmental, a combination of the two? | askscience | https://www.reddit.com/r/askscience/comments/92pem9/how_is_vocal_pitch_determined/ | {
"a_id": [
"e38i0w1"
],
"score": [
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"text": [
"Yay I can answer this!\n\nPitch is determined by the properties of your vocal folds. 3 things determine a person's pitch: length, mass, and stiffness. Greater mass equals lower pitch. Longer vocal folds AT REST equal lower pitch. LENGTHENED vocal... | [] | [] | [
[]
] | |
58ik9x | How did the volcanic ash of Mount Vesuvius preserve the people and items of Pompeii? | I know everything was covered in ash, but I don't see how that preserved everything. | askscience | https://www.reddit.com/r/askscience/comments/58ik9x/how_did_the_volcanic_ash_of_mount_vesuvius/ | {
"a_id": [
"d920c40"
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"score": [
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"text": [
"Art preserved mainly due to lack of oxygen and humidity.\n\nNormally, it takes a very long time for things to get covered into dust and buried into the ground, leaving time for oxygen to bleach every pigment and humidity to make grow molds and ot... | [] | [] | [
[]
] | |
a6eodq | Why did the term "the Holocaust" start appearing in its current meaning around the late seventies? | I recently saw a graph tracking the appearance of the term "the Holocaust" in newspapers and it looked like it wasn't widely used until the late seventies. I was wondering why that was. Was it a question of knowledge and facts surrounding the Holocaust becoming more widely known? Or a question of changing narratives ar... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/a6eodq/why_did_the_term_the_holocaust_start_appearing_in/ | {
"a_id": [
"ebufov0",
"ecpy1ge"
],
"score": [
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2
],
"text": [
"I can only speak for Germany with certainty, but I think it is not so different from other places.\n\nThe word holocaust was usually only known to people with humanistic education, i.e. people who knew ancient languages, es... | [] | [] | [
[],
[]
] | |
2u8kif | the major difference between by current 1080p tv and the uhd and 4k tvs that are on the market? | Also , from what i understand, its really only good if you have an UHD input, so if i was to have one with my current HD movies and games would it improve their current quality some what or would i not notice anything since its not an UHD source? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2u8kif/eli5_the_major_difference_between_by_current/ | {
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"score": [
3,
3,
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"text": [
"Ultra HD TVs have a resolution 4 times greater than a 1080p TV. But in the same way as playing a 480p video on a 1080p TV won't look any better than on a 480p TV or a 720p TV playi... | [] | [] | [
[],
[],
[],
[]
] | |
48f71e | why do crumbs not get mouldy? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/48f71e/eli5_why_do_crumbs_not_get_mouldy/ | {
"a_id": [
"d0j55cc"
],
"score": [
2
],
"text": [
"The moisture evaporates out of them before the mold can spread due to the greater surface area. This perseveres them like a mummy or beef jerky. \n\n"
]
} | [] | [] | [
[]
] | ||
5pyw19 | why do most mouthwash not include fluoride? | Seems illogical to not have fluoride in a substance meant to fight tooth decay. | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/5pyw19/eli5_why_do_most_mouthwash_not_include_fluoride/ | {
"a_id": [
"dcux01m"
],
"score": [
3
],
"text": [
"I didn't realize this was a thing. Ive been buying ACT mouthwash (which has fluoride in it) for years and never really looked at any competitors. Also if I had to guess mouthwash wasn't originally designed to fight tooth decay but instead improve... | [] | [] | [
[]
] | |
6qk9c5 | If placed in a zero-gravity environment with no external gravitational forces, would a liquid form a perfect sphere? | Zero-gravity, *not* micro-gravity | askscience | https://www.reddit.com/r/askscience/comments/6qk9c5/if_placed_in_a_zerogravity_environment_with_no/ | {
"a_id": [
"dky206g"
],
"score": [
13
],
"text": [
"Yes this would indeed happen. This is because every system tries to minimize its energy. In a liquid there is more energy associated to molecules that are at the surface of the liquid, because they can form less coherent bonds with their neighbo... | [] | [] | [
[]
] | |
fd08vu | Why didn't the Qing Dynasty attempt to industrialize when they were defeated time and time again by the Europeans and Japanese? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/fd08vu/why_didnt_the_qing_dynasty_attempt_to/ | {
"a_id": [
"fjhtznc"
],
"score": [
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"text": [
"Posting on mobile, so please forgive any typos:\n\nShort answer:\n\n1) the Qing were so assured of Chinese superiority that they found it difficult to conceive of foreign or 'barbarian' ideas and technologies being useful\n\n2) the imperial exami... | [] | [] | [
[]
] | ||
220wmd | Christian Roman Empire and Recruitment of Non-Christian Troops; question inside | I've just read this statement by the author Alan Moore:
"Largely, this was because Rome relied on foreign troops - on cavalry from Egypt, for example - to defend the Empire . . . . Foreign soldiers were originally happy to enlist, since Rome at that point took a pagan and syncretic standpoint that allowed recruits to ... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/220wmd/christian_roman_empire_and_recruitment_of/ | {
"a_id": [
"cgiw8u2"
],
"score": [
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"text": [
"Looking through secondary sources on Late Roman armies, I am not sure this statement by Moore is sustainable.\n\nHuns, Goths of various kinds, etc., are all use as foederati through the 4th and into the 5th century. Furthermore, there was recruit... | [] | [
"http://www.mainz.de/WGAPublisher/online/html/default/hthn-5tthee.en.html"
] | [
[
"http://en.wikipedia.org/wiki/Late_Roman_army"
]
] | |
3psh39 | How long would evidence of a pre-industrialized society last? | I know this is a bit of a speculative question but about how long would any evidence of a pre-industrialized society last? Had mankind died out from the Black Death how long would there have been evidence that humankind had even been on the planet? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/3psh39/how_long_would_evidence_of_a_preindustrialized/ | {
"a_id": [
"cw96wq2"
],
"score": [
3
],
"text": [
"Given that we have [evidence of humans (Homo erectus) using fire from 1 million years ago](_URL_1_), and that is far from the oldest evidence of hominin activity on the planet, I would say that it would last for a very, very long time. I was jus... | [] | [] | [
[
"http://digashkelon.com/blog",
"http://www.pnas.org/content/109/20/E1215.abstract"
]
] | |
4d3j48 | why are some beers allowed to be imported to the u.s. while others are not? | I would love to find a way to get my hands on some Speights Gold or VB but it doesn't seem to be possible. | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4d3j48/eli5_why_are_some_beers_allowed_to_be_imported_to/ | {
"a_id": [
"d1nfw0m"
],
"score": [
4
],
"text": [
"There's nothing illegal about importing that sorta stuff. If there was enough demand, someone would find out how to import whatever the hell they think they could make a profit off of.\n\nAs it stands, there are so many beers on the market, its a... | [] | [] | [
[]
] | |
4zo27o | why are countries trying to take control of the internet by banning sites and bringing new rules? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4zo27o/eli5_why_are_countries_trying_to_take_control_of/ | {
"a_id": [
"d6xcumv"
],
"score": [
4
],
"text": [
"If you control the information, you control the thoughts and opinions of the people, and thusly control them as well. "
]
} | [] | [] | [
[]
] | ||
24ejvy | how can a company like microsoft fall so far behind and not have the best programmers money can buy for its os and ie? | This is not an opinion post, but I don't understand how IE has fallen so drastically far behind a handful of other browsers, while the OS has not improved in a decade.
It's not like they have to invest money in much else outside of human talent, so I don't imagine it costs too much. How can they not offer like 150% of... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/24ejvy/eli5_how_can_a_company_like_microsoft_fall_so_far/ | {
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"ch6gakx",
"ch6cazf",
"ch6cczw",
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"score": [
4,
2,
3,
2
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"text": [
" > This is not an opinion post, \n\n > the OS has not improved in a decade.\n\nWell, it is an opinion post. And only someone who's never used Windows would ever think that Windows ... | [] | [] | [
[],
[],
[
"http://html5test.com/"
],
[
"http://en.wikiquote.org/wiki/Marc_Andreessen"
]
] | |
3t5kwv | What exactly causes flame coloring when burning sodium chloride? | Usually sodium in atomic form has its outer electron risen in energy level by the heat of the flame. The electron falling back to a normal energy level emits light (reflects light?) in a specific wave length.
In sodium chloride the sodium is in its ionic form thus has no outer electron. Where does it get it from? I r... | askscience | https://www.reddit.com/r/askscience/comments/3t5kwv/what_exactly_causes_flame_coloring_when_burning/ | {
"a_id": [
"cx39d1a"
],
"score": [
7
],
"text": [
"Great question! Both of the mechanisms you list are possible, and in fact can happen depending on the experimental conditions. To see which mechanism dominates, it's easiest to start by looking ar an actual experiment, the [flame test on sodium c... | [] | [] | [
[
"https://www.youtube.com/watch?v=g_krKmQLcqM"
]
] | |
4p4qt7 | Why is the Fertile Crescent now desert? | It seems to me quite weird that the cradle of civilisation now seems to be land that doesn't seem very fertile. Was wondering if my assumptions about the Fertile Crescent 7'000 years ago is correct and if so what caused its demise as an agricultural heartland? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/4p4qt7/why_is_the_fertile_crescent_now_desert/ | {
"a_id": [
"d4i1yg8",
"d4ibqew",
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"score": [
1537,
59,
491
],
"text": [
"(EDIT: slightly revised and added conclusion)\n\nShifting weather patterns played a part, but the Fertile Crescent was always susceptible to desertification. \n\nThe Tigris and Euphrates had wide ... | [] | [] | [
[
"http://indico.ictp.it/event/a04207/session/38/contribution/19/material/0/0.pdf"
],
[
"http://www.fao.org/docrep/x5321e/x5321e04.htm",
"https://www.theguardian.com/society/2015/jan/15/farm-africa-goats-ethiopia-guardian-charity-appeal-dfid",
"http://johns-green-issues.blogspot.com/2006/12/goat... | |
a3gy7q | Why are there no early hominids? | Since we evolved from monkeys, how come there isn't any early hominids in the process of evolving still? Would it make sense for life to have an evolution cut-off? | askscience | https://www.reddit.com/r/askscience/comments/a3gy7q/why_are_there_no_early_hominids/ | {
"a_id": [
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"eb6ha67",
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"score": [
55,
6,
5,
13
],
"text": [
"There are early hominids in the process of evolving. They're called Homo Sapiens.\n\nBut more generally you question could be rewritten as \"How come there aren't other species o... | [] | [] | [
[],
[],
[],
[]
] | |
3xuo82 | why do vr devices use two displays instead of one big one? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/3xuo82/eli5_why_do_vr_devices_use_two_displays_instead/ | {
"a_id": [
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"score": [
7,
2,
2
],
"text": [
"3d vision works because each eye sees a slightly different image (from two different angles). Our brain merges the two images to create a 3d picture. Two displays, one for each eye, allows the VR device... | [] | [] | [
[],
[],
[]
] | ||
dgry99 | what is so special about vinegar that it is used as a cleaning solution? | I see vinegar being recommended for all DIY home cleaning solutions (even for cleaning urine, which I would have thought needs an enzymic cleaner). What is so special about it? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/dgry99/eli5_what_is_so_special_about_vinegar_that_it_is/ | {
"a_id": [
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31,
7,
7,
11,
7
],
"text": [
"Distilled white vinegar, which is usually around 5% acetic acid, has pH of somewhere between 2-3. This is quite acidic. That means it can disolve common hou... | [] | [] | [
[],
[],
[],
[],
[]
] | |
e51yxh | i read in an enviromental awareness chart that aluminium cans take 100 years to decompose but plastic takes more than million years. what makes the earth decompose aluminium and why can't it do the same for plastic? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/e51yxh/eli5_i_read_in_an_enviromental_awareness_chart/ | {
"a_id": [
"f9h3554",
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"f9hwx88",
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"f9idyb8",
"f9imu97",
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"score": [
51,
7842,
... | [] | [] | [
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[],
[],
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[],
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[],
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[]
] | ||
3rshln | how are audio files structured? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/3rshln/eli5_how_are_audio_files_structured/ | {
"a_id": [
"cwqzmzf"
],
"score": [
7
],
"text": [
"Sound is caused by waves in the air, and an audio file is essentially a digital recording of that wave.\n\nComputers can store audio by taking samples of the amplitude of the wave at regular intervals. So for example the sample rate of CD audio i... | [] | [] | [
[
"https://www.youtube.com/watch?v=R7D1f6U6TpU"
]
] | ||
2dxhn7 | what would happen to my boobs in zero gravity? | So I wouldn't need to wear a bra? I was hesitant to post this but I'm really curious. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2dxhn7/eli5_what_would_happen_to_my_boobs_in_zero_gravity/ | {
"a_id": [
"cju0yp1",
"cju185t",
"cju2scn",
"cju3klz"
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"score": [
3,
8,
2,
3
],
"text": [
"Well they would be free of the grasp of gravity (mostly). So yes the girls would float freely.\n\nOf course you should probably still where a bra... unless you prefer your tits bo... | [] | [] | [
[],
[
"http://youtu.be/yKWvRU-879w"
],
[],
[]
] | |
1f2c5m | How was French territory in the Americas organized? | The British had the 16 colonies, the Spanish had the viceroys, but what did the French have? Did the low population of French colonies in the Americas negate the need for separate regions, or is this a situation of it not being interesting enough for most history classes to teach it? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1f2c5m/how_was_french_territory_in_the_americas_organized/ | {
"a_id": [
"ca64pxb"
],
"score": [
10
],
"text": [
"I'm the curator at a museum that (partially) deals with the French colonization of Texas, so I can answer this!\n\nIt's a little complicated. The Department of the Marine oversaw French colonization efforts, at least on the French end. These a... | [] | [] | [
[]
] | |
4my2kf | why should i trust elevators? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4my2kf/eli5_why_should_i_trust_elevators/ | {
"a_id": [
"d3z8oq9",
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"score": [
2,
6,
2
],
"text": [
"Statistically, they're pretty much the safest form of travel. Safer than cars, planes, bicycles, etc. The cables never break because there are like 20 of them and they can hold far more than the capacit... | [] | [] | [
[],
[],
[
"http://www.ideafinder.com/history/inventions/elevator.htm",
"http://science.howstuffworks.com/science-vs-myth/everyday-myths/question730.htm"
]
] | ||
7sqi37 | how do computer-based analogue synthesisers work? how are they different to digital synths? | Computers work in 1s and 0s, but analogue synths sound so much nicer than digital ones - what are they doing that's different? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/7sqi37/eli5_how_do_computerbased_analogue_synthesisers/ | {
"a_id": [
"dt6q33h"
],
"score": [
2
],
"text": [
"Analogue synths sound better because you're more used to their sound, they've been in mainstream music for 30 years now. There are plenty of digital emulators for these that now sound identical though.\n\nWell anyways, these digital synthesisers ... | [] | [] | [
[]
] | |
c1zg8l | what happens if i play a 1080p video on a 720p display? | [deleted] | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/c1zg8l/eli5_what_happens_if_i_play_a_1080p_video_on_a/ | {
"a_id": [
"erglbts",
"erglcdy"
],
"score": [
9,
2
],
"text": [
"The image gets shrunk. There are several ways of doing that. You could just skip pixels.\n\nSo for instance, a line from the image with 8 pixels:\n\n 12345678\n\nwhen shrunk by half would become:\n\n 1357\n\n\nYou don'... | [] | [] | [
[],
[]
] | |
dxziju | what is chirp laser pulse | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/dxziju/eli5what_is_chirp_laser_pulse/ | {
"a_id": [
"f7xj9cv",
"f7xp5vt"
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"score": [
10,
2
],
"text": [
"Chirped Pulse Amplification is the term you are looking for. \nBasically, if you tried to pump too much power into a laser, you'd probably melt the equipment. \nNow instead if you split up a laser beam into little bits, p... | [] | [] | [
[],
[]
] | ||
8whdcn | why checking accounts are more popular than savings in the us? | Checking doesn't give you any interest on your money whereas Savings does. So why do everyone prefer Checking over Savings? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/8whdcn/eli5_why_checking_accounts_are_more_popular_than/ | {
"a_id": [
"e1vixuc",
"e1vj12y",
"e1vj1bz",
"e1vj5hz",
"e1vjqpd",
"e1vke1l",
"e1vmzfz"
],
"score": [
10,
4,
8,
9,
2,
2,
2
],
"text": [
"That’s not always true. I know many of the checking accounts my bank offers have interest. Plus, with some banks ... | [] | [] | [
[],
[],
[],
[],
[],
[],
[]
] | |
23g8mp | Is there any theoretical, rather than empirical, model for vapor pressure? | I've noticed that every method I've come across for describing vapor pressure (Antoine Eqn, other more exotic equations) seems to use empirically-derived constants to predict it. Is there any *theoretical* equation to predict vapor pressure, based on thermodynamics? If so, why aren't we using it? If not, why not? | askscience | http://www.reddit.com/r/askscience/comments/23g8mp/is_there_any_theoretical_rather_than_empirical/ | {
"a_id": [
"cgwq1yy",
"cgws012"
],
"score": [
3,
2
],
"text": [
"Antoine's equation is not empirical. Its based on thermodynamics and is the result of applying some key assumptions to the Clapyeron equation (let me know if I forgot any)\n\n1. The gas phase is ideal. \n\n2. The enthalpy... | [] | [] | [
[],
[]
] | |
161iqq | Why does alcohol cause facial flushing in some people but not others? | I've heard of the Asian Glow phenomenon and its genetic origin, but I experience the same flushing with no known asian ancestors. | askscience | http://www.reddit.com/r/askscience/comments/161iqq/why_does_alcohol_cause_facial_flushing_in_some/ | {
"a_id": [
"c7rthjp",
"c7ru15m",
"c7rv34t"
],
"score": [
8,
3,
8
],
"text": [
"The genetics of the enzyme responsible for the tolerance to alcohol is not specifically limited to those of Asian descendants. While those of European descent are far more likely to have increased toler... | [] | [] | [
[],
[
"http://en.wikipedia.org/wiki/Alcohol_flush_reaction#Causes"
],
[
"https://www.23andme.com/health/Alcohol-Flush-Reaction/",
"https://www.23andme.com/health/Alcohol-Flush-Reaction/howitworks/"
]
] | |
5h9ph0 | Are there any known instances of Southern slave owners ignoring the end of slavery after the Civil War? | and what happened to them if there were?
EDIT: to clarify, I'm not asking about de facto slavery where poor black farmers remained financially chained to former plantation owners for decades. I'm talking about the immediate days after the end of the war. Are there any known cases of slave owners willfully choosing t... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/5h9ph0/are_there_any_known_instances_of_southern_slave/ | {
"a_id": [
"dayydtx",
"dayzepb",
"daz2ptr",
"dazcq6x"
],
"score": [
17,
915,
31,
4
],
"text": [
"As a follow up, where there any slaves who remained working the plantations under the same land owners.",
"**Yes, and they generally were prosperous, successful businesspeo... | [] | [] | [
[],
[],
[],
[]
] | |
4vt732 | What contributions did Europeans make on technology in China before the 18th century? | [deleted] | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/4vt732/what_contributions_did_europeans_make_on/ | {
"a_id": [
"d61j0qx"
],
"score": [
2
],
"text": [
"Off the top of my head, lens-based optical instruments, including telescopes and eyeglasses, were largely absent from China before being introduced sometime in the late 14th or early 15th century. Despite having a sophisticated domestic industry... | [] | [] | [
[]
] | |
2naguc | Has a pope ever led an army into battle? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/2naguc/has_a_pope_ever_led_an_army_into_battle/ | {
"a_id": [
"cmbxx7w"
],
"score": [
43
],
"text": [
"here's an earlier thread: _URL_0_\n\n\nThat should provide much more info than I could!"
]
} | [] | [] | [
[
"http://www.reddit.com/r/AskHistorians/comments/25xtqe/were_there_any_warrior_popes/"
]
] | ||
6c122l | how do the postal service check contents of a mail/package? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/6c122l/eli5_how_do_the_postal_service_check_contents_of/ | {
"a_id": [
"dhr7sil"
],
"score": [
3
],
"text": [
"USPS is allowed to open any media mail package. Media mail is used to send books, CDs, DVD, and other printed educational material. USPS is allowed to open and inspect media mail packages by law, and I have heard stories of packages sent by media... | [] | [] | [
[
"https://about.usps.com/notices/not121/not121_tech.htm"
]
] | ||
2mczzb | If time slows down and eventually stops at the speed of light, can one theorize that if we develop Faster than Light travel (FTL), one would be effectively going backwards in time when travelling FTL? | askscience | http://www.reddit.com/r/askscience/comments/2mczzb/if_time_slows_down_and_eventually_stops_at_the/ | {
"a_id": [
"cm33p4j"
],
"score": [
56
],
"text": [
"Yep. That's exactly what would happen. But we happen to know that it would take an infinite amount of energy to reach the speed of light."
]
} | [] | [] | [
[]
] |
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