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 |
|---|---|---|---|---|---|---|---|---|---|
1ckr8t | Do any historians use the Holocene Era calendar in their work? (current year = 12013 HE) | After going to a museum exhibit about the Qin dynasty in the 3rd century BC, I became confused and irritated about dates going backwards, since I don't normally think that way. I had heard a while ago about the [Holocene Calendar](_URL_0_), proposed in 1993 to solve this issue.
It has increasing dates for all of human... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1ckr8t/do_any_historians_use_the_holocene_era_calendar/ | {
"a_id": [
"c9hhkrp",
"c9hmwwv"
],
"score": [
14,
6
],
"text": [
"Would this really solve things? It's still arbitrary and yet western-centric. I agree it's inconvenient having a date system that reverses at one point, but it's still better than the traditional reign-year system they stil... | [] | [
"http://en.wikipedia.org/wiki/Holocene_Era"
] | [
[
"http://en.wikipedia.org/wiki/North_Korean_calendar"
],
[]
] | |
3wluk0 | what are the specific characteristics that define classical music? | Can a piece composed in 2015 be considered classical? Also, can the soundtracks of video games such as Skyrim or Dragon's Dogma be considered classical music? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/3wluk0/eli5_what_are_the_specific_characteristics_that/ | {
"a_id": [
"cxx6bmw",
"cxx6kbe"
],
"score": [
7,
5
],
"text": [
"In the broadest sense, \"classical\" music can mean any type of Western \"art music\" played by acoustic instruments, particularly the violin family, and with less emphasis on improvisation and repetition than folk or popula... | [] | [] | [
[],
[]
] | |
1b5ym3 | Is there any form of Earthly life deriving energy that did not originate from the sun to fuel itself? | A few years ago, I took my first molecular biology class in college, and my professor asked us 'what constitutes life.' Occasionally I've gone back to that question and adjusted my answer (things that contain carbon based (on Earth at least) genetic information and can replicate), but I've always struggled to come up w... | askscience | http://www.reddit.com/r/askscience/comments/1b5ym3/is_there_any_form_of_earthly_life_deriving_energy/ | {
"a_id": [
"c93ww7y",
"c93wyfk",
"c93y95p"
],
"score": [
26,
16,
2
],
"text": [
"The Earth's centre is primarily heated by radioactive decay (it also had a kick-start due to gravitational heating). Anything that gets its energy from thermal vents is getting energy from a non-solar... | [] | [] | [
[],
[],
[]
] | |
1b6lf6 | Sources of steel/iron in medival Europe. | So, I have this image in my head (thanks mostly to fantasy novels and movies) of medieval Europeans using steel and iron for everything from armor and weapons to tools, horeshoes, and nails. Is this accurate? If so, where did they get all this steel? Was iron ore gathered/mined and processed (refined, smelted, whatever... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1b6lf6/sources_of_steeliron_in_medival_europe/ | {
"a_id": [
"c944mnh",
"c949cge"
],
"score": [
3,
4
],
"text": [
"In early times, a lot of iron ore resources came from swamps [bog iron](_URL_0_). For example the Vikings and the Russians this was a major source of iron. The time period you're describing is medieval times, by then a lot o... | [] | [] | [
[
"http://en.wikipedia.org/wiki/Bog_iron"
],
[
"http://en.wikipedia.org/wiki/Carruca"
]
] | |
5nsg2k | why do so many train tracks run along creeks and rivers? | [deleted] | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/5nsg2k/eli5_why_do_so_many_train_tracks_run_along_creeks/ | {
"a_id": [
"dcdxq71",
"dcdy4a6",
"dcdzagd",
"dcemp2y"
],
"score": [
31,
13,
3,
3
],
"text": [
"Rivers tend to form in places that have a long, continuous, mostly-gradual path from high to low places. This is exactly the sort of path trains need, as they cannot climb (or sa... | [] | [] | [
[],
[],
[],
[]
] | |
77en1w | why are some words pluralized with an "i"? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/77en1w/eli5_why_are_some_words_pluralized_with_an_i/ | {
"a_id": [
"dol6ryx",
"dol6tol",
"dolc98z"
],
"score": [
9,
2,
3
],
"text": [
"Those are words of Latin origin of male gender ending in -us. \n\nThe ~~declination~~ declension of those words demands an -i in the plural. \n\nSee [here](_URL_0_) for a full list of all forms of the s... | [] | [] | [
[
"http://thelatinlibrary.com/101/Declension2.pdf"
],
[],
[]
] | ||
73golv | how can carbon, hydrogen, and oxygen be rearranged to make up so many different things? | For example, the formula for sucrose (sugar), is C6H22O11, while ethanol (alcohol) is C2H5OH. Sugar and alcohol are very different, yet they are comprised of the same elements. How can this be? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/73golv/eli5_how_can_carbon_hydrogen_and_oxygen_be/ | {
"a_id": [
"dnq5off",
"dnqob9q"
],
"score": [
3,
3
],
"text": [
"Actually hydrogen cannot be arranged too differently. It can be H2, the gas. When combined with oxygen it can form water, H2O, or a hydoxyl group which will react with something. It is when these two types of atom combine wi... | [] | [] | [
[],
[]
] | |
21sjwu | Why doesn't a plane naturally go in circles when one engine fails? | It seems like the thrust only coming from one wing would cause it to go in circles kind of like when you paddle a boat from one side. Or is it possibly naturally doing that and the pilot counters it? | askscience | http://www.reddit.com/r/askscience/comments/21sjwu/why_doesnt_a_plane_naturally_go_in_circles_when/ | {
"a_id": [
"cggb7m6",
"cggbqbp"
],
"score": [
3,
5
],
"text": [
"Thrust always acts relative to the center of mass, so in the event of an engine loss, the plane will tend to rotate \"away\" from the active engine. The pilot (or autopilot) will counter this using trim in the case of normal... | [] | [] | [
[],
[
"http://en.wikipedia.org/wiki/File:Bijlmerramproute.png"
]
] | |
1xl630 | if i file for bankruptcy.... | ELI5:
If I file for bankruptcy what happens to all of my debts?
How are the people that I am indebited to get affected by this? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1xl630/if_i_file_for_bankruptcy/ | {
"a_id": [
"cfcc06n",
"cfccaws",
"cfccs70"
],
"score": [
6,
2,
3
],
"text": [
"The people you owe money to get screwed.\n\nThe Court (assuming they agree to your claim of bankruptcy) will gather up all of your assets and sell them off, paying out the proceeds to your debtors.\n\nT... | [] | [] | [
[],
[],
[]
] | |
74yav2 | how are us military units numbered? if there's a 501st battalion, are there 500 others active at the same time? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/74yav2/eli5_how_are_us_military_units_numbered_if_theres/ | {
"a_id": [
"do1zrdf",
"do20bqu"
],
"score": [
10,
8
],
"text": [
"The military gets bigger and smaller over time. A lot of units are disbanded based on requirements or the most decorated and acomplised ones are kept when others are cut but they keep their names. \n\nSame reason for MI5 an... | [] | [] | [
[],
[]
] | ||
d1unev | Is there value in viewing history through a lens of modern morality? | What I mean by this is often I'll see people defend atrocious acts or now condemned opinions of past peoples or simply ignore as "A product of the time".
an example being H.P Lovecrafts writings are often considered racist and this is handwaved as a product of the time but it's still there in his works it hasn't and w... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/d1unev/is_there_value_in_viewing_history_through_a_lens/ | {
"a_id": [
"ezrhj4c"
],
"score": [
38
],
"text": [
"**NSFW Warning, Quotation From 1910s Letter With Racist, Anti-semitic Language, Be advised**\n\n > **What I mean by this is often I'll see people defend atrocious acts or now condemned opinions of past peoples or simply ignore as \"A product of... | [] | [] | [
[]
] | |
2n20a0 | Are there lone groups of "planets" in the distance between stars? | askscience | http://www.reddit.com/r/askscience/comments/2n20a0/are_there_lone_groups_of_planets_in_the_distance/ | {
"a_id": [
"cm9qs00",
"cm9whef"
],
"score": [
12,
2
],
"text": [
"Groups? Doubtful. Rouge planets do get kicked out of solar systems during their formation, or systems with complicated and unstable orbits can eventually kick out a planet (or gravitational interaction with a nearby stellar... | [] | [] | [
[
"http://www.newscientist.com/article/dn26601-saturns-calming-nature-keeps-earth-friendly-to-life.html?utm_source=NSNS&utm_medium=SOC&utm_campaign=twitter&cmpid=SOC|NSNS|2014-GLOBAL-twitter#.VHBphckrrJh"
],
[
"http://blogs.discovermagazine.com/badastronomy/2011/05/18/the-galaxy-may-swarm-wi... | ||
1n6ane | How does a DDWFTTW vehicle actually get energy to move in a straight line directly downwind faster than the wind behind it? | I'm familiar with sailboats that tack to go faster than the wind, but a DDWFTTW vehicle appears to be able to do it in a straight line with the wind directly behind it. I can grok the sailboat example, but I don't get how a vehicle being pushed only from behind by wind of 10mph can reach 25+mph. To my mind (and I'll ad... | askscience | http://www.reddit.com/r/askscience/comments/1n6ane/how_does_a_ddwfttw_vehicle_actually_get_energy_to/ | {
"a_id": [
"ccfz4f8"
],
"score": [
3
],
"text": [
"In analyzing the system, you can look at either forces or energy. In either case you must not come up with a contradiction.\n\nIn looking at forces, we have the force of the propeller against the air and the force of the wheels against the groun... | [] | [] | [
[]
] | |
axbmmj | why is it okay for us to eat raw eggs but not raw chicken? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/axbmmj/eli5_why_is_it_okay_for_us_to_eat_raw_eggs_but/ | {
"a_id": [
"ehshl02"
],
"score": [
9
],
"text": [
"It is not okay to eat raw eggs in every part of the world. Some places have the same salmonella problems with eggs as they do with chicken. It is not universally safe to eat raw eggs in the US."
]
} | [] | [] | [
[]
] | ||
anacdl | what does ping 127.0.0.1 do? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/anacdl/eli5_what_does_ping_127001_do/ | {
"a_id": [
"efrwo52",
"efrwq72",
"efrwsfy",
"efrwv6s"
],
"score": [
2,
4,
3,
2
],
"text": [
"127.0.0.1 is the “loopback” address, which basically means it points to the machine sending the request (your own computer). Pinging that address has no real purpose, other than ma... | [] | [] | [
[],
[],
[],
[]
] | ||
bj0y3l | How did Christians reconcile their hatred of sorcery with the stories of Merlin and the quest for the Holy Grail? | I have been reading Le Morte D'Arthur and have also been getting into Dungeons and Dragons recently. I was curious why the figureheads of the Satanic Panic during the 1980s related the stories of fantastic heroes in a medieval setting hunting dragons and going on great quests with the worship of Satan rather than the s... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/bj0y3l/how_did_christians_reconcile_their_hatred_of/ | {
"a_id": [
"em4t20t"
],
"score": [
9
],
"text": [
"I have an answer to an earlier question along the same lines (one of my favorites!):\n\n* [If the use of magic was seen as heresy in the Catholic church, why was Merlin, a renowned wizard, seen as a good and admirable figure from the Arthurian l... | [] | [] | [
[
"https://www.reddit.com/r/AskHistorians/comments/68jwfl/if_the_use_of_magic_was_seen_as_heresy_in_the/"
]
] | |
c199va | In the Ancient times, how did they know what time it was, and if they had a meeting, like the senate in Rome, how did they know what time it was and was it normal that people was late because they had different views on time? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/c199va/in_the_ancient_times_how_did_they_know_what_time/ | {
"a_id": [
"ercg3g1"
],
"score": [
78
],
"text": [
"There is already a great answer by u/Celebreth here ( [_URL_1_](_URL_0_)) on Ancient Greece - I will try to do the same for Rome.\n\nIn Ancient Rome, things were somewhat complicated. While everyone could more-or-less agree on what time it was *... | [] | [] | [
[
"https://www.reddit.com/r/AskHistorians/comments/69knux/time_keeping_in_ancient_rome/",
"https://www.reddit.com/r/AskHistorians/comments/69knux/time\\_keeping\\_in\\_ancient\\_rome/"
]
] | ||
5pj6bd | which symptoms of the flu are caused by the virus itself and which are caused by our body trying to destroy the virus? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/5pj6bd/eli5_which_symptoms_of_the_flu_are_caused_by_the/ | {
"a_id": [
"dcrkxc2",
"dcrlifu"
],
"score": [
81,
16
],
"text": [
"Symptoms of the flu are actually often caused by your body trying to rid itself of the virus; high fever is a way to try and kill the virus by essentially cooking it, but in the process destroys a lot of your own cells, wh... | [] | [] | [
[],
[]
] | ||
53h3rp | How did the nazi leadership, SS and death squads justify/rationalise the holocaust? | Unless every single person involved in the holocaust was a psychopath with no capacity for empathy (i know many if not most of them were) i have difficulty understanding how an entire state of people could be capable of such a massive atrocity. How did the Nazis manage to dehumanise the Jewish people and other groups s... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/53h3rp/how_did_the_nazi_leadership_ss_and_death_squads/ | {
"a_id": [
"d7t2esz"
],
"score": [
5
],
"text": [
"The Final Solution underwent many different forms and changes before we finally arrive at the terrible conclusion that takes the form of the death camps like Auschwitz and Treblinka, and much of what was done to exclude and expel the Jewish peopl... | [] | [] | [
[]
] | |
17upcm | Why don't Britain, Israel & New Zealand have written constitutions? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/17upcm/why_dont_britain_israel_new_zealand_have_written/ | {
"a_id": [
"c892mbj",
"c892qki",
"c892t3i"
],
"score": [
11,
6,
6
],
"text": [
"I can't speak intelligently about Israel or New Zealand, but Britain does have a written consitution (for the most part). However, it is not a single document, but rather a large body of laws, court d... | [] | [] | [
[
"http://en.wikipedia.org/wiki/Parliamentary_sovereignty"
],
[
"http://en.wikipedia.org/wiki/Constitution_of_New_Zealand"
],
[
"http://main.knesset.gov.il/Activity/Legislation/Pages/BasicLawsAndConstitution.aspx"
]
] | ||
32kk7c | The universe is expanding, and people would too if not for gravity, electromagnetism, and the nuclear forces. Where does the energy to resist the "expansion force" come from? | Every point in the universe is "moving" away from every other point because space is expanding. This includes the space between the sun and earth, the space between me any you, and the space between my own atoms. So two atoms in my body (for example) are constantly being moved away from each other, but electromagnetism... | askscience | http://www.reddit.com/r/askscience/comments/32kk7c/the_universe_is_expanding_and_people_would_too_if/ | {
"a_id": [
"cqcixbr"
],
"score": [
3
],
"text": [
"*\"Every point in the universe is \"moving\" away from every other point because space is expanding. This includes the space between the sun and earth, the space between me any you, and the space between my own atoms.*\"\n\nI don't think your pre... | [] | [] | [
[]
] | |
3o21e9 | Were Slavs a single people at one point? Or did they just share a single language? | I've noticed that my friends from other Slavic tribes and I have a fairly easy time understanding each other in our native tongues. So this got me wondering if at one point all Slavs were essentially one ethnicity or if we just happened to share a common language. I'd really appreciate any input on this. Thanks in adva... | askscience | https://www.reddit.com/r/askscience/comments/3o21e9/were_slavs_a_single_people_at_one_point_or_did/ | {
"a_id": [
"cvudbzs"
],
"score": [
2
],
"text": [
"The answer lies in your question already; in short: we share similarities because we were once a single people with single language and due to migrations that happened in the past the language differences were created. Slavs share common language... | [] | [] | [
[
"http://www.utexas.edu/cola/centers/lrc/general/ie-lg/Balto-Slavic.html",
"http://www.andrzejb.net/slavic/",
"http://blog.ut.ee/what-is-the-origin-of-the-slavs/",
"https://robertlindsay.wordpress.com/2010/11/06/mutual-intelligibility-of-languages-in-the-slavic-family/"
]
] | |
1fhr85 | Are some breeds of dogs, such as pitbulls, truly more aggressive than other breeds? Or is it a case of nurture where they tend to be raised by people who get them to be guard dogs, for example? | I was just reading [this news article](_URL_0_) about a pit bull attacking a woman who had raised him since he was a puppy. She expressed surprise about the attack and insisted the dog had never shown violent tendencies. Unsurprisingly the article reignited the debate about nature vs nurture with certain dog breeds, an... | askscience | http://www.reddit.com/r/askscience/comments/1fhr85/are_some_breeds_of_dogs_such_as_pitbulls_truly/ | {
"a_id": [
"caaltyq",
"caamz50"
],
"score": [
2,
2
],
"text": [
"[Click here](_URL_0_) for an overview provided by the AVMA of the current status of scientific study into the role of breed in dog bite risk. The overview provides references to 53 analyses published in peer reviewed journal... | [] | [
"http://www.dailymail.co.uk/news/article-2334412/I-treated-like-kids--Woman-lost-arms-eye-ear-attack-pit-bulls-calls-tougher-control-breed.html#comments"
] | [
[
"https://www.avma.org/KB/Resources/Backgrounders/Pages/The-Role-of-Breed-in-Dog-Bite-Risk-and-Prevention.aspx",
"http://images.bimedia.net/documents/Dog+attack+stats+with+breed+2012.pdf"
],
[]
] | |
5h6oyz | Do Godel's Incompleteness theorems currently have use whatsoever in Physics? If not, might they some day? | I am plowing through Godel Escher Bach for the second time at the moment (amazing read) and I was curious as the what connection (if any) the strange incompleteness of formal systems has with the physical universe. | askscience | https://www.reddit.com/r/askscience/comments/5h6oyz/do_godels_incompleteness_theorems_currently_have/ | {
"a_id": [
"daxtwi8",
"daxu001",
"daxu75r",
"daxwp58",
"day8n9d",
"daybh5f"
],
"score": [
6,
45,
7,
4,
7,
5
],
"text": [
"From a philosophical point of view, it limits the notion of determinism. Even if we give a completely axiomatic description of a natura... | [] | [] | [
[
"https://en.wikipedia.org/wiki/Boolean_satisfiability_problem"
],
[
"https://arxiv.org/abs/1502.04573"
],
[],
[],
[
"http://math.sfsu.edu/smith/Math800/Units/Goedel&Tarski.pdf"
],
[]
] | |
15vp54 | modern, postmodern and all that other art that i really don't get. | Stuff like Jasper Johns and Robert Rauschenberg have never really made sense to me. I try, but I just don't get it. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/15vp54/eli5_modern_postmodern_and_all_that_other_art/ | {
"a_id": [
"c7q9fj9",
"c7qar92"
],
"score": [
6,
3
],
"text": [
"In terms of paintings.\n\nOne thousand years ago:\n\nPeople hire artists to make pictures of themselves looking handsome and wise, and to make their enemies look evil. Or to record facts and stories. Artists are craftsmen.\n... | [] | [] | [
[],
[
"http://en.wikipedia.org/wiki/File:PicassoGuernica.jpg",
"http://en.wikipedia.org/wiki/File:El_Tres_de_Mayo,_by_Francisco_de_Goya,_from_Prado_thin_black_margin.jpg",
"http://en.wikipedia.org/wiki/File:Velazquez-The_Surrenderof_Breda.jpg"
]
] | |
3zuqle | How do nocturnal animals produce vitimin D without sunlight? | askscience | https://www.reddit.com/r/askscience/comments/3zuqle/how_do_nocturnal_animals_produce_vitimin_d/ | {
"a_id": [
"cypchwa"
],
"score": [
18
],
"text": [
"Some nocturnal animals sleep in areas that have sun exposure, like sloths. Others, like bats, apparently are [deficient](_URL_0_) in vitamin D, but it doesn't seem to impair their metabolism or serum mineral concentration. [Cows](_URL_1_), while... | [] | [] | [
[
"http://www.ncbi.nlm.nih.gov/pubmed/12899852",
"http://www.ncbi.nlm.nih.gov/pubmed/20412916"
]
] | ||
2355ko | why are some perfumes and colognes so expensive? | Hundreds of dollars for a couple of ounces of fluid? What gives? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2355ko/eli5_why_are_some_perfumes_and_colognes_so/ | {
"a_id": [
"cgtiudv",
"cgtk23f"
],
"score": [
6,
2
],
"text": [
"They're luxury goods and status symbols. The same goes for designer clothes and jewelry. You're paying for the name and the prestige.\n\nThey do generally use better quality ingredients, but they definitely make a big profit... | [] | [] | [
[],
[]
] | |
bvlq52 | the difference between curies, roentgen, rad, rem, sieverts, grays... | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/bvlq52/eli5_the_difference_between_curies_roentgen_rad/ | {
"a_id": [
"epqkfz2",
"eprjb3u"
],
"score": [
3,
3
],
"text": [
"Curie measures the radioactivity or radioactive decay of a material and is outdated as a unit (modern unit is the becquerel).\n\nRoentgen (named after the German physicist who identified xrays) is another outdated unit used ... | [] | [] | [
[],
[]
] | ||
3gnoz5 | Why is the German Panther tank (49.4 short tons) classified as a medium tank while Allied tanks with the same weight, such as the M26 Pershing (46 short tons) and IS-2 (51 short tons) classified as heavy tanks? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/3gnoz5/why_is_the_german_panther_tank_494_short_tons/ | {
"a_id": [
"ctzz4f1"
],
"score": [
27
],
"text": [
"It had a lot to do with the function of the tank. A Medium Tank, at this time, was meant to function in most roles, primarily in combined arms, being able to take out enemy tanks while at the same time being fast, armored, and versatile enough t... | [] | [] | [
[]
] | ||
2je7cp | when to adjust iso versus shutter speed versus aperture? | I understand what each of them do independently, but I don't really understand how one knows which times to adjust what. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2je7cp/eli5when_to_adjust_iso_versus_shutter_speed/ | {
"a_id": [
"clavhfh",
"claykta"
],
"score": [
3,
2
],
"text": [
"It depends on what you want the image to look like. If you know what they do independently, you should be able to figure out what you're prioritizing. It depends what you're taking pictures of and how you want it to look.\n\... | [] | [] | [
[],
[]
] | |
fjspm | Interpretations of Quantum Mechanics | Is there a preferred interpretation of quantum mechanics among the majority of physicists? I'm only somewhat familiar with some of the more basic undergrad level mathematical calculations surrounded QM and never really got into understanding any of the wider epistemological considerations.
Are there any ongoing exper... | askscience | http://www.reddit.com/r/askscience/comments/fjspm/interpretations_of_quantum_mechanics/ | {
"a_id": [
"c1gg41j",
"c1gg6ar",
"c1gg6fy",
"c1gg6xi",
"c1ggwfj"
],
"score": [
3,
5,
7,
2,
2
],
"text": [
"The Copenhagen interpretation is by far the most accepted among physicists. While theres a certain appeal to the many worlds interpretation, there's no reaso... | [] | [] | [
[],
[],
[],
[],
[]
] | |
bs1nna | Why is gold used on connector ends, like on usb-connectors for gaming mice, when copper has lower electrical resistivity? | I'm reading about electrical components and a table in my book describes "Resistivities of common conductors". Here ideal resistance is described by:
& #x200B;
Resistance = rho (material resistivity) \* L (length of wire) / A (area of cross section of wire)
& #x200B;
With unit \[10\^(-8) Ohm meters\] copper i... | askscience | https://www.reddit.com/r/askscience/comments/bs1nna/why_is_gold_used_on_connector_ends_like_on/ | {
"a_id": [
"eoi53py",
"eoi6ovp",
"eoi70sg",
"eoi83cg",
"eoia2hn",
"eoia46l",
"eoiaugq",
"eoikla6",
"eoilr6m",
"eoir4w7",
"eoiu6jd",
"eoiuul9",
"eoj1wjf",
"eoja28p",
"eok1ou6",
"eok7wh0",
"eokg52w",
"eokpmqj",
"eol6j5v",
"eolemze"
],
... | [] | [] | [
[],
[],
[],
[],
[],
[],
[],
[],
[],
[],
[],
[],
[],
[],
[],
[],
[],
[],
[],
[]
] | |
2cbqq4 | If you freeze soda water, will it still be carbonated when you unfreeze it? | Or does the carbon dioxide get removed in the process? | askscience | http://www.reddit.com/r/askscience/comments/2cbqq4/if_you_freeze_soda_water_will_it_still_be/ | {
"a_id": [
"cjdwkqv",
"cje64mc"
],
"score": [
383,
2
],
"text": [
"It depends.\n\nIf you freeze a carbonated beverage in a sealed container, and the container remains sealed and doesn't leak, then yes the CO2 will re-enter the beverage once it is a liquid again. This is because the conten... | [] | [] | [
[
"https://www.youtube.com/watch?v=fz94wsj0T1A"
],
[]
] | |
2v709g | if we have telescopes that can see galaxies light years away, what's the reason we focus them on nearby planets to take a look at their surfaces? | Typo! I mean't to ask "what's the reason we *don't* focus them..." | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2v709g/eli5_if_we_have_telescopes_that_can_see_galaxies/ | {
"a_id": [
"coezkvz",
"coezltl",
"cof03oj",
"cof056q"
],
"score": [
3,
10,
2,
28
],
"text": [
"I think you forgot a 'don't in your question.\n\nI have no idea what the answer is, I'm guessing it has to do with resolution. I have wondered a similar thing about pointing tele... | [] | [] | [
[],
[
"https://what-if.xkcd.com/32/"
],
[],
[]
] | |
27t4um | When I turn in a flashlight, am I creating photons, or turning 'on' photons that are all around me, or something else entirely? | askscience | http://www.reddit.com/r/askscience/comments/27t4um/when_i_turn_in_a_flashlight_am_i_creating_photons/ | {
"a_id": [
"ci4dal4",
"ci4j2zk",
"ci4ohvt",
"ci4opgx",
"ci4re8q",
"ci4s15m"
],
"score": [
47,
147,
3,
12,
2,
5
],
"text": [
"The simple answer is that a photon is a form of raw energy. If something is moving, it has kinetic energy. If slows down, it now h... | [] | [] | [
[],
[],
[
"http://en.wikipedia.org/wiki/Quantum_field_theory"
],
[],
[],
[
"https://www.youtube.com/watch?v=1qQQXTMih1A",
"https://www.youtube.com/watch?v=eebWoZkN3FQ",
"http://science.howstuffworks.com/light7.htm"
]
] | ||
2rpkg5 | what exactly is going on in my digestive system to make beer shits so awful? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2rpkg5/eli5_what_exactly_is_going_on_in_my_digestive/ | {
"a_id": [
"cni2yq1",
"cni49qd"
],
"score": [
2,
2
],
"text": [
"Just talked about this yesterday. They are terrible but my God are they satisfying. ",
"Drinking draft? More carbonation equals more gas...more gas equals more explosive shits. Try bottles and pizza if you want to pass a... | [] | [] | [
[],
[]
] | ||
35k2a4 | how do dogs and cats easily determine each other's sex? | When I'm looking at animals, even animals I'm very familiar with, I have to check their junk to tell their gender. And with cats, sometimes I still get it wrong. I know that there are subtle differences in size and stuff, but what are the distinguishing features that help my dog determine male from female in other dogs... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/35k2a4/eli5_how_do_dogs_and_cats_easily_determine_each/ | {
"a_id": [
"cr54vsf",
"cr54w83",
"cr553an"
],
"score": [
7,
3,
10
],
"text": [
"They can tell in the same way we do, there are certain traits (other than genitalia) which the different sexes have0. Sexual dimorphism (the difference between sexes) is actually less in humans than it... | [] | [] | [
[],
[],
[]
] | |
34loc9 | What is flux? | Learning about magnetism and electric fields and this was brought up. I also am confused why you need to take an integral of "B dA " if that makes any sense. | askscience | http://www.reddit.com/r/askscience/comments/34loc9/what_is_flux/ | {
"a_id": [
"cqvz58u",
"cqvz65q"
],
"score": [
5,
2
],
"text": [
"You can just compare it to the flux of a liquid. \n\nLet's say you want a number, that describes how much of a liquid flows through some cross section of a pipe in a given time. You would need to know two things: \n- the vel... | [] | [] | [
[
"http://en.wikipedia.org/wiki/Flux#Flux_as_a_surface_integral",
"http://upload.wikimedia.org/wikipedia/commons/d/d2/Flux_density.svg"
],
[]
] | |
j37hc | If I sat in a computer chair with a freely rotating seat on the north or south pole, after 12 hours would I be looking the exact oppsite direction as I started? | Assuming no to almost no friction in the rotating part of the chair of course... | askscience | http://www.reddit.com/r/askscience/comments/j37hc/if_i_sat_in_a_computer_chair_with_a_freely/ | {
"a_id": [
"c28rfc3"
],
"score": [
3
],
"text": [
"At the moment you put the chair there, you are already rotating (because you stand steadfastly on the rotating earth) and thus the chair in your hands is already rotating. Similarly, when you sit down your body is already rotating and the chair's... | [] | [] | [
[]
] | |
3i8jtq | why are netflix original sitcoms not exactly 30 mintues? | Netflix is a platform that doesn't air commercials and does not need to allow time for advertisments. So, why are their original sitcoms - that weren't filmed to be on NBC or the like - still less than an even 30 minutes long? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/3i8jtq/eli5_why_are_netflix_original_sitcoms_not_exactly/ | {
"a_id": [
"cue7hm5",
"cue8d6y"
],
"score": [
7,
2
],
"text": [
"Netflix doesn't have their own studios. They finance and greenlight these new series, and as a result, they get the exclusive rights for a period of time to them -- pretty much the exact same way a traditional television net... | [] | [] | [
[],
[]
] | |
9bq33j | How do you STRUCTURE a historical essay? | If it's about a historical event do you summarise it from start to finish in one paragraph then flesh it out with body paragraphs? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/9bq33j/how_do_you_structure_a_historical_essay/ | {
"a_id": [
"e54y0mu",
"e552bug",
"e555j8z",
"e55bc3r",
"e55crn8"
],
"score": [
34,
14,
10,
6,
2
],
"text": [
"If I may recommend a book that greatly helped me through my undergrad - Mary Lynn Rampolla's *A Pocket Guide To Writing in History.* There are plenty of di... | [] | [] | [
[],
[],
[],
[],
[]
] | |
9ii5ux | What lead to the end of hangings in the USA? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/9ii5ux/what_lead_to_the_end_of_hangings_in_the_usa/ | {
"a_id": [
"e6k9ms8",
"e6l0r7f"
],
"score": [
6,
7
],
"text": [
"We talking judicial or non-judicial?",
"While you're waiting for an answer, you can start with this recent [post](_URL_0_) regarding the State of Michigan. \n\nEdit: Ok, so a robot politely told me to leave this here to... | [] | [] | [
[],
[
"https://www.reddit.com/r/AskHistorians/comments/93ri8x/the_state_of_michigan_abolished_capital/"
]
] | ||
9fn6i4 | if the universe is infinite why are there estimated to be only 100 billion galaxies? surely the number of galaxies would also be infinite? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/9fn6i4/eli5_if_the_universe_is_infinite_why_are_there/ | {
"a_id": [
"e5xqg71",
"e5xqhz4",
"e5xr5y5"
],
"score": [
10,
2,
3
],
"text": [
"Are you sure that you're not just confusing the fact that the universe is infinite, but there are only 100 billion galaxies in the observable/known universe?",
"2,000,000,000,000 (at least) galaxie... | [] | [] | [
[],
[],
[]
] | ||
2ne6au | What was the Supermarine Spitfire's role during the Battle of Britain? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/2ne6au/what_was_the_supermarine_spitfires_role_during/ | {
"a_id": [
"cmct1am"
],
"score": [
6
],
"text": [
"That question is very vague and general, do you have something specific in mind? The Spitfire was a fighter aircraft, and thus was tasked with shooting down enemy aircraft. Of the two principal fighter types available to the RAF during the battle... | [] | [] | [
[]
] | ||
jo1g3 | If my car was struck by lightning while I was driving, would I/my passengers be grounded by the rubber tires? | They wouldn't take my question on Car Talk, so it's all down to you guys. If I was driving along and my vehicle was directly struck by lightning, what would be the results - ie what would happen to the car and what would happen to its occupants? Would the rubber tires ground the vehicle?
What about if lightning struc... | askscience | http://www.reddit.com/r/askscience/comments/jo1g3/if_my_car_was_struck_by_lightning_while_i_was/ | {
"a_id": [
"c2doz1k",
"c2dpbit",
"c2dpcga",
"c2dpi4o",
"c2doz1k",
"c2dpbit",
"c2dpcga",
"c2dpi4o"
],
"score": [
24,
6,
8,
6,
24,
6,
8,
6
],
"text": [
"No, the rubber insulating you is a common misconception. The lightning has already gone t... | [] | [] | [
[
"https://secure.wikimedia.org/wikipedia/en/wiki/Skin_effect",
"http://www.weatherimagery.com/blog/rubber-tires-protect-lightning/",
"http://www.lightningsafety.com/nlsi_pls/vehicle_strike.html"
],
[
"http://www.youtube.com/watch?v=ve6XGKZxYxA"
],
[
"http://www.lightningsafety.com/nlsi_... | |
19fcws | what's stopping me from succesfully starting up an internet company that offers better services at cheaper prices than what is currently available? | You may all know that AT & T/time warner etc offer shit service at high prices with huge profit margins? I'm struggling to understand why there aren't other companies that are able to compete with them? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/19fcws/whats_stopping_me_from_succesfully_starting_up_an/ | {
"a_id": [
"c8nimf0",
"c8ninu7"
],
"score": [
2,
2
],
"text": [
"There's a *gigantic* entry cost to providing Internet service. You must have agreements in place to let your users send and receive data from literally every other computer on the Internet; you can't start an ISP that only l... | [] | [] | [
[],
[]
] | |
5wdibv | why/how do actors choose their "stage names"? | Do celebrities choose stage names for some small piece of privacy or is it always about marketing themselves?
What makes some names "better" or more marketable than others?
Do they pick them themselves or is it usually a PR person? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/5wdibv/eli5_whyhow_do_actors_choose_their_stage_names/ | {
"a_id": [
"de9825s",
"de9872k",
"de98dm0",
"de98xxa"
],
"score": [
2,
11,
11,
17
],
"text": [
"In the old days it would be done by actors with foreign sounding names who didn't want to be thought of as foreign. Today it's usually just someone with a hard to pronounce or c... | [] | [] | [
[],
[],
[],
[]
] | |
xxl8x | what causes, or, what IS, that centre chest pain associated with guilt/being hurtful? | askscience | http://www.reddit.com/r/askscience/comments/xxl8x/what_causes_or_what_is_that_centre_chest_pain/ | {
"a_id": [
"c5qjx0u",
"c5qjzpv"
],
"score": [
2,
2
],
"text": [
"I've found a possible theory on the cause of psychological chest pain:\n\n(_URL_0_)\n > According to a 2009 study from the University of Arizona and the University of Maryland, activity in a brain region that regulates emot... | [] | [] | [
[
"http://www.scientificamerican.com/article.cfm?id=what-causes-chest-pains"
],
[
"http://redd.it/vccv6"
]
] | ||
1x52tf | How did the nursing/lactating relationship evolve? | So many small incremental steps are involved in evolution. A creature develops a gland that secretes something (probably not nutritional). A youngling is born that needs early nutrition without the ability to eat available food. How does this complex relationship develop incrementally? | askscience | http://www.reddit.com/r/askscience/comments/1x52tf/how_did_the_nursinglactating_relationship_evolve/ | {
"a_id": [
"cf8af4k"
],
"score": [
2
],
"text": [
"A bit old, but quite worth a read, [this paper](_URL_0_). Their proposed mechanism is: \n\n > * 1 Evolution of egg-incubation behaviour in a mammal-like reptile, \nfollowing development of hair, endothermy, and cutaneous glands. \n\n > * 2 Evolu... | [] | [] | [
[
"http://www2.trincoll.edu/~blackbur/1989-Blackburn++Lactation.pdf"
]
] | |
1hzn5v | why tv ads are so important in american politics | For example, the ["Harry and Louise" ad](_URL_0_) that hurt the Clinton health care plan. From what I've read, US Congress members become cozy with special interests because they need campaign money, and they need campaign money to buy TV advertising slots so they don't get defeated come re-election time. Is American p... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1hzn5v/eli5_why_tv_ads_are_so_important_in_american/ | {
"a_id": [
"caziwns",
"cazmm98"
],
"score": [
4,
2
],
"text": [
"A thirty second commercial is a lot easier for someone to remember and internalize than a paragraph from a speech or an op-ed. It's not entirely attributable to national culture, it's just that we're visual creatures and go... | [] | [
"http://www.youtube.com/watch?v=CwOX2P4s-Iw"
] | [
[],
[]
] | |
1yzlvg | I have always been told that we dont know how people were able to construct the ancient pyramids. I have never thought about it from a critical perspective until today. Do we know how the pyramids were built? | I know pyramids have been found on in different countries continents. If that is a problem lets talk about the ones in Egypt, but now question is really about all of them.
What I have been told is that they are too big, and that the building materials should not have been available at the time, and that the cuts of s... | askscience | http://www.reddit.com/r/askscience/comments/1yzlvg/i_have_always_been_told_that_we_dont_know_how/ | {
"a_id": [
"cfpa6k2",
"cfpatz2",
"cfpbkvq",
"cfpc1t0",
"cfpc8ej",
"cfpcvsc",
"cfpddgx",
"cfpiu6i",
"cfptyzz"
],
"score": [
35,
3,
5,
15,
13,
6,
7,
5,
8
],
"text": [
"I studied it briefly in my history class last term. There was a hug... | [] | [] | [
[
"http://www.pbs.org/wgbh/nova/pyramid/"
],
[],
[],
[
"http://www.youtube.com/watch?v=YTgxGJfXRQ0",
"http://khufu.3ds.com/fileadmin/kheops/images/gallery/microgravimetry1.jpg",
"http://patentpending.blogs.com/.a/6a00d83451c56869e20162fdb1d310970d-pi"
],
[
"http://www.youtube.com/wat... | |
2f32ua | What caused the social revolution of the 1960s, with the resultant movement towards more liberal attitudes regarding race, women and sexuality? If it was WW2, why didn't similar things happen after previous major wars? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/2f32ua/what_caused_the_social_revolution_of_the_1960s/ | {
"a_id": [
"ck5j99q"
],
"score": [
3
],
"text": [
"No revolution, social or otherwise starts overnight. For most social revolutions in 60s, the spark was long in place before WWII came, but found itself greatly assisted by the war and the post war period. For race relations in America, the [Doub... | [] | [] | [
[
"http://www.learner.org/courses/amerhistory/resource_archive/resource.php?unitChoice=19&ThemeNum=3&resourceType=2&resourceID=10106"
]
] | ||
1jquu3 | how do those who engage in illicit trafficking via tor know the entire network isn't an elaborate trap set up by the state department? | I'm relatively new to posting to Reddit, so apologies if I somehow break etiquette here, but I've searched ELI5, Tor, and SR and haven't found a complete answer. Here's what I have found:
-The US Navy and State Department have both publicly backed Tor.
-There are no huge security clearances required to run a server... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1jquu3/eli5_how_do_those_who_engage_in_illicit/ | {
"a_id": [
"cbhe2eu",
"cbhee27",
"cbhesx0",
"cbhghnx",
"cbhigv8",
"cbhlmzg"
],
"score": [
18,
48,
4,
35,
2,
2
],
"text": [
"I don't know much about TOR because I'm still learning cryptography. However it is my understanding TOR is split into three different... | [] | [] | [
[],
[
"https://gitweb.torproject.org/tor.git"
],
[],
[],
[],
[]
] | |
699wag | How did ancient cities like Jerusalem expand with massive walls? | Did they start building vertically? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/699wag/how_did_ancient_cities_like_jerusalem_expand_with/ | {
"a_id": [
"dh50yl8",
"dh533ee",
"dh5d05q"
],
"score": [
15,
10,
3
],
"text": [
"A common misconception about walled cities is that dense constructions were built right up against the walls. Although the city centers were almost always dense and crowded, it was common for there to... | [] | [] | [
[
"https://www.reddit.com/r/AskHistorians/comments/5t12oi/im_a_governor_of_a_roman_city_my_city_has_been/ddjzzf2/",
"https://www.reddit.com/r/AskHistorians/comments/4jxwid/how_crowded_were_the_streets_and_markets_of/d3bmasq/"
],
[],
[]
] | |
1ta99f | what is the point of the 'press any key' screen in games? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1ta99f/eli5_what_is_the_point_of_the_press_any_key/ | {
"a_id": [
"ce5xqaq",
"ce5zkuz"
],
"score": [
9,
5
],
"text": [
"The game just wants to make sure you are actually there. Usually the stuff that happens after a press any key screen is something that the game doesn't want you to miss because you'd have a bad experience otherwise. So, next... | [] | [] | [
[],
[
"http://gaming.stackexchange.com/questions/18780/why-do-console-games-require-a-button-press-before-showing-the-main-menu"
]
] | ||
6e05yp | how is it that illiteracy still exists in the united states? | Given that school is required for kids how is it that not everyone has become literate by now in the United States? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/6e05yp/eli5_how_is_it_that_illiteracy_still_exists_in/ | {
"a_id": [
"di6m8tu",
"di6manv",
"di6zay1"
],
"score": [
21,
35,
4
],
"text": [
"They can make you be physically present in school until you're 18 and gain your full rights as a person. What they *can't* do is make you pay attention or remember anything, that part is up to you.",
... | [] | [] | [
[],
[],
[
"https://www.ted.com/talks/ken_robinson_says_schools_kill_creativity",
"http://ektr.uni-eger.hu/wp-content/uploads/2015/11/deschooling-society-a-brief-summary.pdf"
]
] | |
19l14n | why do medicine bottles say you shouldn't crush or dissolve the pills? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/19l14n/why_do_medicine_bottles_say_you_shouldnt_crush_or/ | {
"a_id": [
"c8ozdpv",
"c8oziar",
"c8p6n6d"
],
"score": [
2,
5,
3
],
"text": [
"Because you shouldn't crush or dissolve the pills. Some pills contain ingredients that may harm your mouth if you chew them. Some pills are designed to work after digestion.",
"Medicine is designed ... | [] | [] | [
[],
[],
[]
] | ||
an97nt | Why do nails stick in car tires instead of being shot out due to tire pressure? | askscience | https://www.reddit.com/r/askscience/comments/an97nt/why_do_nails_stick_in_car_tires_instead_of_being/ | {
"a_id": [
"eft1is7",
"eft5m8u"
],
"score": [
7,
2
],
"text": [
"There is a lot of friction between the tire tread and the sides of the nail. There is only a very small surface area (the end of the nail) for the pressure to act on, so the net push outwards is very small, not enough to ove... | [] | [] | [
[],
[]
] | ||
9qq6fe | how fast can a quasar star spin? | I just read in another post that some quasars spin in 1.4ms. That seems impossibly fast - if I could stand on the surface, would I be going close to the speed of light? What's the limiting factor? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/9qq6fe/eli5_how_fast_can_a_quasar_star_spin/ | {
"a_id": [
"e8b39k6"
],
"score": [
11
],
"text": [
"The fastest millisecond pulsars are in the 1.5 milisecond (670 Hz) range. Assuming they're of typical size (~20 km in diameter) that gives you an equatorial speed around 43 million m/s.\n\nPretty fast, but light is *300* million m/s.\n\nSo how ... | [] | [] | [
[]
] | |
22l4e1 | how did the different english accents come about? when did american english begin to change and when did the australian accent differ from england's english. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/22l4e1/eli5_how_did_the_different_english_accents_come/ | {
"a_id": [
"cgnwctb",
"cgnx8vf",
"cgny9u0",
"cgo1o8l",
"cgo1y0g",
"cgo3vgu"
],
"score": [
8,
23,
3,
3,
3,
3
],
"text": [
"go over to r/linguistics they talk about this kind of stuff a lot",
"Language evolves all the time: you almost certainly don't spea... | [] | [] | [
[],
[],
[],
[],
[],
[]
] | ||
6jfrb8 | What is the advantage of creating bipedal walking robots? | After watching the video of OSUs Cassie here: _URL_0_
I was wondering why so much interest in making robots able to walk on two legs. What could a two legged robot do that a drone/wheeled/four legged robot couldn't? | askscience | https://www.reddit.com/r/askscience/comments/6jfrb8/what_is_the_advantage_of_creating_bipedal_walking/ | {
"a_id": [
"djexd43"
],
"score": [
2
],
"text": [
"A bipedal might go most of the places a person could, and do most of the things in a world built for people. A quadruped might have difficulty reaching beyond legs. Wheels might not negotiate obstacles so well. Drones might not lift as much an... | [] | [
"https://www.youtube.com/watch?v=Is4JZqhAy-M&feature=youtu.be"
] | [
[]
] | |
33uigr | How Fast Are Calories Absorbed? | I was watching a documentary that presented some "facts" that seemed a bit fishy.
This documentary stated that foods high in fiber such as "almonds" remain in digestive limbo for longer then sugary foods, which are "instantly" converted to fat.
My question is this, are foods eaten allocated for calories needed to l... | askscience | http://www.reddit.com/r/askscience/comments/33uigr/how_fast_are_calories_absorbed/ | {
"a_id": [
"cqokmt2",
"cqomdey",
"cqomx9x"
],
"score": [
6,
3,
4
],
"text": [
"Yes. There is an intricate system of enzymes and metabolic pathways that are arranged to make sure that the current energy needs are met, and that we only store energy when we have excess amounts of it.... | [] | [] | [
[],
[],
[]
] | |
5tx32e | why does one get heavy sweating before getting healed from a fever? | I usually dont sweat much when I get a fever but suddenly I get drenched in sweat the night before I get cured, why does that happen? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/5tx32e/eli5_why_does_one_get_heavy_sweating_before/ | {
"a_id": [
"ddps3iz",
"ddq4u0f"
],
"score": [
4,
2
],
"text": [
"A fever isn't actually the illness, it is the response. \n\nWhen you are feeling sick, your body will commit more energy towards immune response, and one symptom is a fever. What your body is doing is basically ramping up yo... | [] | [] | [
[],
[]
] | |
3hryjv | Why does the amount of oxygen in our atmosphere remain stable? | We saw how variable oxygen levels have been in the past as they where building up in the atmosphere. Now we seem to have settled at ~20%.
I've read that even 5% more would dramatically increase how readily things would combust (likely would cause some pretty big problems), and 5% less would effect our breathing, an... | askscience | http://www.reddit.com/r/askscience/comments/3hryjv/why_does_the_amount_of_oxygen_in_our_atmosphere/ | {
"a_id": [
"cua59rd",
"cuaiwb3"
],
"score": [
7,
8
],
"text": [
"The % oxygen has varied a lot over the lifespan of the earth, but it is much like climate where it very seldom changes dramatically in a short amount of time (short in relation to the lifespan of earth) at some point, as the... | [] | [] | [
[],
[
"http://news.nationalgeographic.com/news/2011/08/110808-ancient-insects-bugs-giants-oxygen-animals-science/"
]
] | |
fl956q | Why were there so many soldiers in WW1 battleships? | I’m very interested in history but not well-versed. I have found the battle of Jutland to be very interesting but one thing that I couldn’t figure out is why the battleships had over 1000 men on them? Did it really take that many to run things? Or were they doubling as transports? Or is it something else that I’m compl... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/fl956q/why_were_there_so_many_soldiers_in_ww1_battleships/ | {
"a_id": [
"fkxezum",
"fkxf2fn",
"fkxspu2"
],
"score": [
12,
50,
2
],
"text": [
"It was mostly because yes you did need that many people for doing everything that needed to be done, to the margins acceptable for both the heat of battle, and running a massive warship 24/7.\n\nIf th... | [] | [] | [
[
"https://www.reddit.com/r/AskHistorians/comments/61sad5/the_hms_barham_had_1184_crew_what_are_the_duties/dfgzeab/"
],
[],
[]
] | |
9wp949 | Since horses are not native to the North American continent, how did they become available to Native Americans before Europeans came over? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/9wp949/since_horses_are_not_native_to_the_north_american/ | {
"a_id": [
"e9m97vx"
],
"score": [
75
],
"text": [
"Horses went extinct in North America at the end of the Pleistocene (about 12,000 years ago). They didn't return to the Americas until Europeans arrived. While small numbers of horses escaped or were targeted specifically for capture in conflicts... | [] | [] | [
[]
] | ||
192nnq | Did World War One trenches extend north to the sea/south to the mountains? | What happened to the trenches at the extreme north and extreme south of the fronts during World War One? Did they extend all the way to the sea/Switzerland along the western front? How about the eastern? Anywhere else? Pictures would be cool, too, as I can find none on google. | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/192nnq/did_world_war_one_trenches_extend_north_to_the/ | {
"a_id": [
"c8ka86u",
"c8kdoow",
"c8ke7hj",
"c8kjwlw"
],
"score": [
13,
6,
3,
3
],
"text": [
"I remember seeing a photograph of the extreme northern end of the front which had wooden barricades with barbed wire extending out onto the beach. They probably would have only ne... | [] | [] | [
[],
[
"http://www.schweizer-festungen.ch/1914-18_ww1.htm#border"
],
[
"http://www.reddit.com/r/AskHistorians/comments/t8svx/what_did_the_intersection_of_the_swiss_border_and/"
],
[
"http://i.imgur.com/y5cWQtT.jpg",
"http://sunnycv.com/steve/ww1/images/westpoint11.jpg",
"http://www.worl... | |
5z3ffw | why was the transition of germany into a democracy in ww2 so smooth (for the most part) compared to the attempted transitions in middle eastern countries? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/5z3ffw/eli5_why_was_the_transition_of_germany_into_a/ | {
"a_id": [
"deuzmkb",
"dev0os3",
"devifig"
],
"score": [
3,
6,
3
],
"text": [
"Remember, self rule is not absent in German history. Under the Kaiser, the Reichstag stood as a parliamentary system, and under Bismarck, universal male suffrage was implemented. In practice, the Reichs... | [] | [] | [
[],
[],
[]
] | ||
6ttsqj | what performance difference can we see between an athlete that warms up and one that doesnt before a race? | I would like to know specifically about cyclists | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/6ttsqj/eli5_what_performance_difference_can_we_see/ | {
"a_id": [
"dlnjx5w",
"dlnk04j",
"dlnke5q",
"dlon7y3"
],
"score": [
4,
9,
66,
5
],
"text": [
"Well I'm no expert but I do play hockey. When I myself do not warm up the first half period of my game is warm up, and I only start playing at my full potential around 2/3 of the ... | [] | [] | [
[],
[],
[],
[]
] | |
1a15qe | Is there a limit to the amount of information that could theoretically be stored in the universe? Can you store more than one bit (piece) of information using a single particle? | I have no educational background in how information is stored / quantum computing, but it struck me that the at the very least you would need at least one particle, in a certain position, to store one piece of information. Does that mean that there is somehow a maximum amount of information that could be stored, being ... | askscience | http://www.reddit.com/r/askscience/comments/1a15qe/is_there_a_limit_to_the_amount_of_information/ | {
"a_id": [
"c8t6iq1",
"c8t6kx6"
],
"score": [
8,
2
],
"text": [
"Related to your question is [Landauer's principle](_URL_0_) which has to do with the minimum amount of energy needed to change a bit. Essentially, the laws of thermodynamics can be used to prove that changing a bit of inform... | [] | [] | [
[
"http://en.wikipedia.org/wiki/Landauer's_principle"
],
[
"http://en.wikipedia.org/wiki/Bekenstein_bound"
]
] | |
1sltba | what is the clunking noise that cars make in movies when they die? | There's always this noise when a car comes to a stall in almost every movie. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1sltba/eli5_what_is_the_clunking_noise_that_cars_make_in/ | {
"a_id": [
"cdyv1je"
],
"score": [
2
],
"text": [
"The car is briefly \"dieseling.\""
]
} | [] | [] | [
[]
] | |
abtj05 | Would a creating artificial gravity through a centrifuge impact something like a watch's time over a period of time? | If someone had 2 very accurate clocks and one was placed in a centrifuge to create strong artificial gravity, would the clock in the centrifuge eventually be measurably ahead of the other one? | askscience | https://www.reddit.com/r/askscience/comments/abtj05/would_a_creating_artificial_gravity_through_a/ | {
"a_id": [
"ed5ruhh"
],
"score": [
6
],
"text": [
"The clock in the centrifuge would measure behind the other one. If you observe the system in the external frame, the time dilation observed for the centrifuge clock is equivalent to that predicted by special relativity.\n\nIf you're in the centri... | [] | [] | [
[
"https://journals.aps.org/pr/abstract/10.1103/PhysRev.129.2371"
]
] | |
xwapa | how does the mars rover curiosity transmit data over such uber long distance? | How does Curiosity transmit data over such long distance: satellites? What type of equipment is used? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/xwapa/how_does_the_mars_rover_curiosity_transmit_data/ | {
"a_id": [
"c5q4pzw",
"c5q75w8",
"c5qdr8q"
],
"score": [
27,
12,
2
],
"text": [
"Rover tone transmit - > mars orbiter - > earth satellite - > JPL",
"I worked with signal equipment in the military so I know a little about earthly communications. Maybe someone else can answer... | [] | [] | [
[],
[],
[]
] | |
2jrmn7 | if sugar, fat, and salt play to our dopamine levels, what do spices (like black pepper, cumin, cinnamon, tumeric, etc) do to our brain? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2jrmn7/eli5_if_sugar_fat_and_salt_play_to_our_dopamine/ | {
"a_id": [
"cleg6ty"
],
"score": [
3
],
"text": [
"with pepper, and spicy things in general, they also release dopamine and other chemicals. I think it's your brains natural response to the pain. "
]
} | [] | [] | [
[]
] | ||
1b9z0t | what physics are behind this "stunt"? | [I'm blown away](_URL_0_),I have no idea how this is possible. He attempts to explain it but I still don't get it (I wasn't a very good physics student) | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1b9z0t/eli5_what_physics_are_behind_this_stunt/ | {
"a_id": [
"c94zm9r",
"c950cbf",
"c951mnn"
],
"score": [
3,
4,
2
],
"text": [
"What I've been able to find through googling this experiment is that it has something to do with \"the conservation of angular momentum\".\n\nI found a video of some high schoolers doing different thing... | [] | [
"http://www.wimp.com/spinningdisk/"
] | [
[
"http://youtu.be/UZlW1a63KZs"
],
[
"http://science.howstuffworks.com/gyroscope.htm",
"http://www2.eng.cam.ac.uk/~hemh/gyroscopes/onetofour.html",
"http://www.youtube.com/watch?v=lvPAjr_a6Jg"
],
[
"http://www.youtube.com/watch?v=cRJv6z_bxQg"
]
] | |
gcf9b | DAE think maybe Dark Matter is the new Luminiferous Aether? | I don't hold a degree or anything but I try to follow physics as a hobby, can someone try to explain dark matter to me? All I ever see about it is that it's deduced and unobserved.
**EDIT** Thank you all very much. Askscience might be my new favorite reddit. I find this stuff fascinating. Can anyone recommend a... | askscience | http://www.reddit.com/r/askscience/comments/gcf9b/dae_think_maybe_dark_matter_is_the_new/ | {
"a_id": [
"c1mjgam",
"c1mjwv3",
"c1mk2pr"
],
"score": [
13,
5,
41
],
"text": [
"You have the gist of it, pretty much.\n\nThe general consensus, so far, is that some sort of extra, non-luminous matter best explains what we see in the rotation curves of galaxies and globular cluste... | [] | [] | [
[],
[],
[
"http://www.google.com/images?q=galactic%20rotation%20curve"
]
] | |
fgkoez | why is it more pleasing to listen to my favourite songs when they randomly play on the radio rather than picking them myself in music streaming apps? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/fgkoez/eli5_why_is_it_more_pleasing_to_listen_to_my/ | {
"a_id": [
"fk54ghj"
],
"score": [
2
],
"text": [
"Because it's reassuring, pleasant, and/or exciting to feel that someone else shares your taste in music. \n\nYou kinda feel vindicated, which doesn't happen when you're doing the choosing."
]
} | [] | [] | [
[]
] | ||
8juq9v | court stenographer machines can capture entire conversations in real time but no one uses them as computer keyboards? why? are they harder to use? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/8juq9v/eli5_court_stenographer_machines_can_capture/ | {
"a_id": [
"dz2ke5m",
"dz2l0vv"
],
"score": [
6,
3
],
"text": [
"[A stenotype machine](_URL_0_) isn't just a quick way of typing, it's also a form of [shorthand](_URL_2_). It's not a 100% accurate way of recording things, it's just a really good way to capture things quickly. You have t... | [] | [] | [
[
"https://en.wikipedia.org/wiki/Stenotype",
"https://en.wikipedia.org/wiki/Chorded_keyboard",
"https://en.wikipedia.org/wiki/Shorthand"
],
[]
] | ||
2ctuib | why does taking precautionary antibiotics after something like surgery help pathogens to become drug-resistant? | I has surgery on my foot and the podiatrist put me on antibiotics for the week after the surgery. When this was mentioned to my best friend's mom, who is a nurse practitioner, she made it very clear how against it and what a bad idea it is. I understand how starting an antibiotic and stopping before you've taken the fu... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2ctuib/eli5_why_does_taking_precautionary_antibiotics/ | {
"a_id": [
"cjixjbu"
],
"score": [
2
],
"text": [
"Antibiotics help create drug resistant infection by exposing the infection to the drug.\n\nThey then mutate to be able to work against the drug, and become drug resistant.\n\nSimilar to how humans were once prey, and then evolved to be able to fi... | [] | [] | [
[]
] | |
2vzg0f | How did the sun get to be made primarily out of Hydrogen, while the planets are not? | I understand the Solar System came from a nebula, but how did the Sun end up to be mostly Hydrogen? Is it just the size and other planets have a proportional amount of it? And why are the planets closest to the sun mostly rock, while the further away they get, they are mostly gas? | askscience | http://www.reddit.com/r/askscience/comments/2vzg0f/how_did_the_sun_get_to_be_made_primarily_out_of/ | {
"a_id": [
"com94vs",
"comatks",
"comav9b"
],
"score": [
6,
62,
5
],
"text": [
"When the universe cooled sufficiently after the Big Bang, matter started to form: hydrogen, helium, and a bit of lithium. All, other elements are created in the interiors of stars via fusion. So far, ... | [] | [] | [
[],
[
"http://en.wikipedia.org/wiki/Jupiter#Composition",
"http://en.wikipedia.org/wiki/Saturn#Physical_characteristics",
"http://en.wikipedia.org/wiki/Star_formation",
"http://en.wikipedia.org/wiki/Uranus",
"http://minerva.union.edu/parkashv/planets.html#Frost_Line",
"http://en.wikipedia.... | |
avml9r | why does stress and sleep deprivation lower your libido? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/avml9r/eli5_why_does_stress_and_sleep_deprivation_lower/ | {
"a_id": [
"ehg9l8s",
"ehga42k"
],
"score": [
5,
2
],
"text": [
"Sex makes babies.\n\nBabies make stressed and lose sleep.\n\nIf already tired and stressed, your body no want add babies.",
"Cortisol is released during stress. It has an adverse affect on your health (including sex driv... | [] | [] | [
[],
[]
] | ||
9jwxan | how do geologists record historic and pre-historic tsunamis? | After reading about the 2018 Indonesian Tsunami (prayers to the affected), I checked Wikipedia for list of the tsunamis. There were records of tsunamis all the way from ≈7000–6000 BCE. How do they record/identify those kinds (up to 1001 CE, I guess)??
& #x200B;
P.S.: I didn't know if Physics flair was correct for t... | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/9jwxan/eli5_how_do_geologists_record_historic_and/ | {
"a_id": [
"e6upsli",
"e6uvh6w"
],
"score": [
2,
2
],
"text": [
"Tsunamis are huge waves, whose height can exceed tens of metres. The insane amount of energy in the wave lifts up boulders, carrying them all the way upshore. The heavy rocks are then dropped in a semi-neat line where the wa... | [] | [] | [
[],
[
"https://www.researchgate.net/publication/277576680_Tsunamis_as_Paleoseismic_Indicators"
]
] | |
bl7qxa | What are the common "old age" failure modes of computer microprocessors? | We all know that mechanical devices fail due to their moving parts wearing out, but what about solid state electronics? If you used an a modern computer microprocessor everyday within its rated specifications until it failed, what wold be the most common failure modes and how long might it last? | askscience | https://www.reddit.com/r/askscience/comments/bl7qxa/what_are_the_common_old_age_failure_modes_of/ | {
"a_id": [
"empf16n"
],
"score": [
2
],
"text": [
"Not sure about lifespans. Even manufactures might have trouble quantifying that. Usually the biggest problem is accidental overheating, but they have automatic protection built in. And running it within it's designed specs and not overclocking m... | [] | [] | [
[]
] | |
eyry3u | how do gene editing techniques target the whole tissue/organ/organism? | There are very good ELI5s on how novel gene editing techniques work. However, editing the DNA of a single cell doesn't seem that useful. How does the edit become expressed in multiple cells? Can this only be achieved during development? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/eyry3u/eli5_how_do_gene_editing_techniques_target_the/ | {
"a_id": [
"fgjm5xu"
],
"score": [
2
],
"text": [
"There are multiple options for trying to genetically engineer tissues/organs/organisms.\n\n1. Get them early -- if you can genetically modify them when they are a single cell (like you said, during development), then once they grow into the compl... | [] | [] | [
[]
] | |
4whknh | why does the text in older movies always move? | For credits or title screens the text never seems to stay in one place. It always slightly moves. Why is that? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4whknh/eli5_why_does_the_text_in_older_movies_always_move/ | {
"a_id": [
"d670tk2",
"d673aaw"
],
"score": [
4,
2
],
"text": [
"Because the text was applied to each frame of the film separately. That is an imperfect process so ... with a little difference in location of the text from frame to frame you've got what essentially amounts to a little ani... | [] | [] | [
[],
[]
] | |
4ocbou | Can an object teleport because of Quantum Mechanics? | Correct me if i'm wrong but from what i know, every object has a wavefunction that has a value at every point in space, and the square of the amplitude is the probability of finding the object at the place. So if an unfathomable number of events were to take place in a universe, can an object teleport due its probabili... | askscience | https://www.reddit.com/r/askscience/comments/4ocbou/can_an_object_teleport_because_of_quantum/ | {
"a_id": [
"d4befft",
"d4bj1g7"
],
"score": [
14,
2
],
"text": [
"In answer to your question, yes, but I wouldn't consider this to be teleportation. The \"location\" of an object is really only defined in any sense by the exact value of its wavefunction over space, and while its true it c... | [] | [] | [
[],
[]
] | |
aisjgz | Could the language i've spoke growing up influence on how my voice sound? | Could the way i use my vocal chords scar, or develop them so my voice would sound totally different if i grew up speaking another language? | askscience | https://www.reddit.com/r/askscience/comments/aisjgz/could_the_language_ive_spoke_growing_up_influence/ | {
"a_id": [
"eeriutt"
],
"score": [
3
],
"text": [
"The answer to your question is mixed, and really depends on what you mean by \"voice\". When a speech-language pathologist (aka speech therapist) refers to voice, we generally view it as breaking down in three main aspects: vocal quality, intensi... | [] | [] | [
[
"https://asa.scitation.org/doi/abs/10.1121/1.3681950",
"https://linguistics.ucla.edu/people/keating/Keating_2016_LSA.pdf"
]
] | |
sv879 | Does EM radiation create overtones? | Sound waves create overtones, but has anyone ever studied the possibility that light waves do as well? If so, couldn't microwaves cause overtones of such a "pitch" that they would be ultraviolet rays? I couldn't find any info on the web about this. | askscience | http://www.reddit.com/r/askscience/comments/sv879/does_em_radiation_create_overtones/ | {
"a_id": [
"c4h9dtx",
"c4h9ijk",
"c4h9rm2"
],
"score": [
2,
5,
4
],
"text": [
"I'm not sure about the answer, but I do think it's more appropriate to say a *source* of EM radiation may or may not create EM overtones. A single-frequency EM wave itself will not create overtones as ... | [] | [] | [
[],
[],
[
"http://en.wikipedia.org/wiki/Frequency_mixer",
"http://en.wikipedia.org/wiki/Local_oscillator",
"http://en.wikipedia.org/wiki/Third-order_intercept_point"
]
] | |
6sbqr9 | how is the production cost for each game of thrones episode $10m, when they have 5 actors who are each receiving $2m per episode this season? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/6sbqr9/eli5_how_is_the_production_cost_for_each_game_of/ | {
"a_id": [
"dlbj6s9",
"dlbjdkl"
],
"score": [
4,
3
],
"text": [
"Every episode has it's own budget based off the budget the studio gives those showmakers. Let's say, like Game of Thrones, you have an 8 episode season, but you just have these 5 characters. The studio would give you $120,00... | [] | [] | [
[],
[]
] | ||
6hcpnz | why is testifying under oath a big deal? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/6hcpnz/eli5_why_is_testifying_under_oath_a_big_deal/ | {
"a_id": [
"dixb56m",
"dixb5sj",
"dixb73m"
],
"score": [
3,
3,
2
],
"text": [
" > I don't see how this oath thing is going to stop these politicians from lying again.\n\nLying under oath is a criminal offense. If they are caught lying then they can be stripped of office and go to... | [] | [] | [
[],
[],
[]
] | ||
33s2co | why is the term "retarded" considered offensive? | Why do people consider the terms "retarded", "mental retardation", etc. offensive? The definition of 'retard' is "delay or hold back in terms of progress, development, or accomplishment." This seems like a very good word to be using to describe someone with a mental deficiency. Why or how did it become offensive to peo... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/33s2co/eli5why_is_the_term_retarded_considered_offensive/ | {
"a_id": [
"cqnv3ij",
"cqnvbyi",
"cqnwarf",
"cqnxzlj",
"cqo6ayf"
],
"score": [
7,
6,
3,
2,
2
],
"text": [
"Definitions of words aren't really important in deciding what people find offensive. F**got and homosexual both mean the same thing, but only one is considere... | [] | [] | [
[],
[],
[],
[],
[]
] | |
1hcvle | the offside rule in football | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1hcvle/the_offside_rule_in_football/ | {
"a_id": [
"cat3jby",
"cat3xez",
"cat4m2j",
"cat5rs2"
],
"score": [
11,
4,
2,
2
],
"text": [
"When a defensive lineman moves before the center snaps the ball into play. If an offensive lineman moves before the ball is snapped, it is called a false start. It is possible for... | [] | [] | [
[],
[],
[
"http://www.fifa.com/aboutfifa/footballdevelopment/technicalsupport/refereeing/laws-of-the-game/law/newsid=1290867.html"
],
[]
] | ||
95g9rh | how do passports from foreign countries (not american) wotk? | I thought a passport allowed someone to legally travel outside their native country. I recently heard that some European passports don’t allow travel to the USA. For example, my friend knows someone from Slovakia, whose passport allows her to travel only throughout Europe. And that person has no criminal record, deport... | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/95g9rh/eli5how_do_passports_from_foreign_countries_not/ | {
"a_id": [
"e3sgvxg",
"e3sh0l4",
"e3sh1wk",
"e3sh51c",
"e3sk7ep"
],
"score": [
4,
12,
3,
2,
2
],
"text": [
"In Canada we basically have the same passport that you do - it's a book with lots of pages for visa stamps, and our photo.\n\nIf you have a European passport... | [] | [] | [
[],
[],
[],
[],
[]
] | |
b4w2b7 | how does p2p encryption work? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/b4w2b7/eli5_how_does_p2p_encryption_work/ | {
"a_id": [
"ej9jups",
"ej9l8qw",
"ej9lm07",
"ej9rwv4"
],
"score": [
22,
6,
7,
3
],
"text": [
"Whenever you send a message, the message is locked (encrypted) using a key . The key is unique in the sense that you and only the intended recipient has the key to that lock. Thus... | [] | [] | [
[],
[],
[],
[]
] | ||
3afpnf | How can black holes emit gamma and x-ray radiation if light can't escape from them? | askscience | http://www.reddit.com/r/askscience/comments/3afpnf/how_can_black_holes_emit_gamma_and_xray_radiation/ | {
"a_id": [
"csc91dx"
],
"score": [
16
],
"text": [
"It's not the black holes themselves that are emitting radiation - it's the matter falling into the black holes. Diffuse matter (gas and dust) in the presence of a compact massive object forms what's known as an [accretion disc](_URL_0_). Matte... | [] | [] | [
[
"https://en.wikipedia.org/wiki/Accretion_disc"
]
] | ||
31tg0k | What happens whith the excess of kinetic energy that isn't being acumulated when a rocket is flying at light speed and keeps thrusting in perfect vacum? | I'm sorry, another light speed question.
What happens with that energy? Does it just disappear? | askscience | http://www.reddit.com/r/askscience/comments/31tg0k/what_happens_whith_the_excess_of_kinetic_energy/ | {
"a_id": [
"cq4tx16",
"cq4w1vf"
],
"score": [
18,
18
],
"text": [
"Well, a rocket can't fly at light speed so the question doesn't really make sense. ",
"If a rocket is flying just under light speed but continually being accelerated (so its kinetic energy must increase), the kinetic e... | [] | [] | [
[],
[
"http://newt.phys.unsw.edu.au/einsteinlight/jw/images/totalenergy2.gif"
]
] | |
4kczk0 | why have we (humans) advanced so much in the last 150 years or so compared to the thousands of years before? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4kczk0/eli5_why_have_we_humans_advanced_so_much_in_the/ | {
"a_id": [
"d3dzs11",
"d3dzsay",
"d3dzsix",
"d3dzvt0",
"d3dzz9a",
"d3dzzvv",
"d3e00nq",
"d3e0k7v",
"d3e0kmi",
"d3e0o1a",
"d3e118v",
"d3e12su",
"d3e18nv",
"d3e1tfb",
"d3e25u8",
"d3e2elo",
"d3e2f5i",
"d3e2j36",
"d3e2jbl",
"d3e2kj0",
"d... | [] | [] | [
[],
[],
[],
[],
[],
[],
[],
[
"http://waitbutwhy.com/2015/01/artificial-intelligence-revolution-1.html"
],
[],
[
"https://en.wikipedia.org/wiki/Connections_(TV_series\\)"
],
[],
[],
[
"https://en.wikipedia.org/wiki/Matthew_Boulton"
],
[],
[],
[],
[],
[],
[],
[... | ||
37f23y | How did the inverted cross (Cross of St. Peter) come to be a symbol of anti-Christian imagery? | The inverted cross come from a tradition that told us Simon Peter was crucified upside down. It is believed that Peter requested this form of crucifixion as he felt he was unworthy to be crucified in the same manner that Jesus died. So we could actually see some churches having an inverted cross instead of the regular ... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/37f23y/how_did_the_inverted_cross_cross_of_st_peter_come/ | {
"a_id": [
"crmbnt7"
],
"score": [
18
],
"text": [
"According to Origen of Alexandria (185-254 CE) and the apocryphal [Acts of Peter](_URL_2_) (200 CE), Peter asked to be crucified upside down as he believed himself unworthy of the same death of Jesus Christ. This is typically seen as an expressi... | [] | [] | [
[
"http://www.bibliotecapleyades.net/sociopolitica/codex_magica/images/dcodex_39.jpg",
"http://cache1.asset-cache.net/gc/163236247-affair-of-the-poisons-black-mass-of-abbot-gettyimages.jpg?v=1&c=IWSAsset&k=2&d=3ZEia0D%2bt0oQsflLnnkojpyK3yyUjrEEC%2bd4NNvv3phonTp7FJOBsn1CiVctiGyPpNLWNsthGDPSF6liDP... | |
2pfrx5 | It is known that a massive supernova exploded in 1054 A.D. that was visible on Earth even during the day. Do any specialists know from there studies if any civilization recorded this phenomenon? | It is known as a handful of Europeans recorded that there was a massive blast that happened during this time, so massive in fact that it was visible during daytime, but were they the only ones?
Are there any recordings from civilizations or people throughout the world, like the Maya, East Asians, Middle eastern Civil... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/2pfrx5/it_is_known_that_a_massive_supernova_exploded_in/ | {
"a_id": [
"cmwb9le",
"cmwhnn0"
],
"score": [
26,
28
],
"text": [
"[Ancestral Pueblo pictographs](_URL_0_) in Peñasco Blanco, Chaco Canyon are believed to refer to the supernova.",
"Seems the Crab Nebula supernova event (that's the 1054 event you are enquiring about, right?) was proba... | [] | [] | [
[
"http://www.hao.ucar.edu/education/archeoslides/slide_20.php"
],
[
"http://www.jstor.org/stable/10.1086/316401",
"http://articles.adsabs.harvard.edu/full/1983Obs...103..106B/0000106.000.html"
]
] | |
22ck67 | In big cities, before cars, where did people keep all those horses? | There must have been a great deal of horses in cities like London, and with overpopulation such a problem in the 19th century where were all those horses housed?
Here's a cool clip from the 19th century:
_URL_0_
| AskHistorians | http://www.reddit.com/r/AskHistorians/comments/22ck67/in_big_cities_before_cars_where_did_people_keep/ | {
"a_id": [
"cglhvsc",
"cglmmyu"
],
"score": [
19,
4
],
"text": [
"Horse ownership was nowhere near as ubiquitous as auto ownership today. The figures I have handy (from Clay McShane's book *Down the Asphalt Path)* are for big US cities, and they indicate about one horse for every 23 peop... | [] | [
"https://www.youtube.com/watch?v=fkHMwPeG1LY"
] | [
[],
[
"http://en.wikipedia.org/wiki/Coaching_inn"
]
] |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.