q_id stringlengths 5 6 | title stringlengths 3 301 | selftext stringlengths 0 39.2k | document stringclasses 1
value | subreddit stringclasses 3
values | url stringlengths 4 132 | answers dict | title_urls list | selftext_urls list | answers_urls list |
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10g9uf | how does a random function work? | If a random function is made up of a certain algorithm, you'd surely be able to somehow calculate it, wouldn't you?
Also, wouldn't it simply repeat itself after a while? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/10g9uf/eli5_how_does_a_random_function_work/ | {
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"Before a matematician/IT guys confirms it, I can say that it takes a really difficult to foresee value (ex. the actual date, up to the hundredth of second) and feed its to a very complex function whose output is even harder... | [] | [] | [
[],
[]
] | |
cj0otb | why can some brands completely rip off other brands designs on certain products? | [deleted] | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/cj0otb/eli5_why_can_some_brands_completely_rip_off_other/ | {
"a_id": [
"evaec1l"
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"score": [
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"text": [
"Per a quick google search, they are often lawsuits for this. However, I’d hazard a guess that court costs and lawyer fees are factored in before moving forward. Generic copy at Walmart maybe only profits 40k$, but the lawsuit would cost 200k for ... | [] | [] | [
[]
] | |
dkh7xr | does convolution of signals have an intuitive explanation like the water-flow example for voltage and current? | I understand convolution from an equation point of view but is there some way to visualize it easily? something similar to the water flow in a pipe example for current through a wire. | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/dkh7xr/eli5_does_convolution_of_signals_have_an/ | {
"a_id": [
"f4f0ure"
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"score": [
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"text": [
"Have you heard of convolution reverb?\n\nBasically, you take an impulse response from, say, a cathedral, and then you can convolve it with any sound signal to make it sound as if it were in the cathedral.\n\nSo i guess a convolution is kind of li... | [] | [] | [
[]
] | |
89pr9h | the definition of “literary theory” | The definition is kind of confusing for me to understand so I was wondering if you lot could explain it to me differently? Thanks! | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/89pr9h/eli5_the_definition_of_literary_theory/ | {
"a_id": [
"dwskrfl"
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"score": [
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"text": [
"I suppose there isnt one definition but a literary theory woukd be a way in which yoi can understand/interpret literature. \nFor example you could read a text in a feminist or post colonial way and theyre both literary theories. \nOr you could th... | [] | [] | [
[]
] | |
26k5hi | Mistakes Germany made on Russia | Hey, can someone explain Germany's mistakes in Russia and the ways it affected the outcome of the war? I know they underestimated Russia's power, and weren't ready for the cold climate, any others? Could you give links (just so i can go ahead and read more by myself).
Thanks in advance!
Cheers! | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/26k5hi/mistakes_germany_made_on_russia/ | {
"a_id": [
"chrt58h",
"chru2yb"
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"score": [
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"text": [
"There are two problems, I think, with the German War in the east. 1) the Germans, due to the racist Nazi ideology, was far too brutal against the Slavic nationalities in the conquered territories. 2) The size and scale of... | [] | [] | [
[],
[]
] | |
15fv5d | Paper vs Electronics | Which is worse for your eyes, reading an actual book for extended periods or using an electronic device such as an Iphone or E-reader? | askscience | http://www.reddit.com/r/askscience/comments/15fv5d/paper_vs_electronics/ | {
"a_id": [
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"score": [
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"text": [
"To add to that, how much difference is there between an e-ink e-reader and an actual book?"
]
} | [] | [] | [
[]
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99cibf | How come Denmark ruled the Kalmar Union during 14-16 centuries, while Sweden was humongous in territory and Norway was considerably larger as well? | Why was Denmark the major power in the Union, being the smallest of the three? Considering the Union was signed in Kalmar, Sweden wouldn’t it make sense for Swedes to rule over the Union? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/99cibf/how_come_denmark_ruled_the_kalmar_union_during/ | {
"a_id": [
"e4o0lpy"
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"score": [
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"text": [
"Well, first let's sort out what the Kalmar Union _was_ (and wasn't). \n\nIt was a personal union, where three different countries had the same monarch. All three Scandinavian countries had elective monarchies at that time, albeit with a preferen... | [] | [] | [
[
"http://dx.doi.org/10.1080/03468750600930720"
]
] | |
ar49ob | how do we know what prehistoric life was like? | Watching through the Walking with Monsters: Life Before the Dinosaurs series... where do our theories of what life was like for those species come from? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/ar49ob/eli5_how_do_we_know_what_prehistoric_life_was_like/ | {
"a_id": [
"egkslbu"
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"score": [
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"text": [
"We have a good understanding of biomechanics, how the shape of bones, their growth and wear patterns, how ligaments were attached, and a lot of the details that tell us how the moved, how they ate and hunted. Teeth can tell you a lot about what... | [] | [] | [
[
"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1634776/"
]
] | |
53uetz | What was the fire rate of the matchlock musket, and how did it compare to wheel locks and flintlocks? | In my European history class, I was told that the matchlock took about two minutes to load, while a wheel lock only took about one. I don't know the firing rate of matchlocks or wheel locks, but I do know that Napoleonic infantry was expected to fire about 4-6 shots per minute with a flintlock. From about 12 seconds to... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/53uetz/what_was_the_fire_rate_of_the_matchlock_musket/ | {
"a_id": [
"d7wlp92"
],
"score": [
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],
"text": [
"16th century sources do indeed tend to be pretty unclear when it comes to firearm's rate of fire. Humfrey Barwick was a strong proponent of firearms at the end of the century and as such is probably represents the upper end of what might be expec... | [] | [] | [
[
"https://www.youtube.com/watch?v=i-lGCtbg580"
]
] | |
cxhe0k | what's a good source of hydration during a hurricane if water supply in stores is sold out? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/cxhe0k/eli5_whats_a_good_source_of_hydration_during_a/ | {
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"score": [
4,
3,
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"text": [
"The point is to stock up beforehand. Water comes out of your faucet for hundreds of times cheaper than in the store.",
"Top part of the toilet. Seems gross but it’s actually clean except for a few ... | [] | [] | [
[],
[],
[]
] | ||
1lvtc4 | why does canceling a credit card with a zero balance hurt my credit score | I got an amazon card because it was supposed to allow me to buy a product on credit and avoid interest charges if I paid in full with in 6 months (20% APR thereafter!). They set my limit at $500 and I found something I wanted that costed about $600. My plan was to buy it and pay off $400 immediately and then $200 over ... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1lvtc4/eli5_why_does_canceling_a_credit_card_with_a_zero/ | {
"a_id": [
"cc38tf7",
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"score": [
3,
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"text": [
"Assuming you have other credit and you have outstanding balances. Canceling increases your credit utilization %..\n\nLets say you have two cards and one has a balance\nA:$50/$100\nB: $0/$100\nYou are using 25% of your availa... | [] | [] | [
[
"http://www.imdb.com/title/tt0762117/"
],
[]
] | |
1w6l9w | Do computer screens have a direct effect on our levels of melatonin? | [This passage](_URL_0_) in the wikipedia states that melatonin is regulated by the amount of blue light, and in the same article, that melatonin helps to regulate sleep.
I'd hypothesize, and I've heard it mentioned, that computer monitors reduce melatonin levels in our bodies. However, I have an applet that tints the... | askscience | http://www.reddit.com/r/askscience/comments/1w6l9w/do_computer_screens_have_a_direct_effect_on_our/ | {
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"score": [
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58,
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"text": [
"Source:\n_URL_0_\n\nBasically yes, but only very slightly. Computer screens do suppress Melatonin levels.",
"Here are a few papers I found that might help this discussion:\... | [] | [
"http://en.wikipedia.org/wiki/Melatonin#Light_dependence"
] | [
[
"http://www.ncbi.nlm.nih.gov/pubmed/21552190"
],
[
"http://www.ncbi.nlm.nih.gov/pubmed/11849730",
"http://www.ncbi.nlm.nih.gov/pubmed/21415172",
"http://justgetflux.com/research.html"
],
[
"http://press.endocrine.org/doi/abs/10.1210/jcem.85.6.6647",
"http://stm.sciencemag.org/conte... | |
22tnmq | why do indian reservations have such high unemployment? | So the common perception of modern Indian Reservations is low income, high unemployment, high crime rates, low standard of living, except in the case of casinos. I guess the first question is, is this actually true, and if so why?
I understand there are probably complex ideas here, but there are probably some simple ... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/22tnmq/eli5why_do_indian_reservations_have_such_high/ | {
"a_id": [
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"text": [
"Very true and in case you have forgotten, the reservations were the tracts of mostly worthless land nobody wanted, far from civilisation. That should explain the dismal prospects ofvthe denizens.",
... | [] | [] | [
[],
[],
[]
] | |
asxdxy | how do motor boat engines not get water logged? | Any time that there's moving parts, especially in a circular motion, wouldn't the water find a way in? Or are the moving parts so disconnected from the engine that it just doesn't reach it? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/asxdxy/eli5_how_do_motor_boat_engines_not_get_water/ | {
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4,
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"text": [
"Same reason your car motor doesn't get water logged when you drive in rain or puddles.\n\nThe motor is not in the water. It's spins a shaft which is also attached to a propeller, that goes into the wate... | [] | [] | [
[],
[
"https://www.powerandmotoryacht.com/.image/t_share/MTUwMTAzMDIyMTA1OTk1MDM0/brackets-on-a-stamas-center-console-.jpg"
],
[]
] | |
8b3pec | Are there any good book (for layman) about climate changes and their impact on the course of human history/prehistory? Hopefully with maps. | Climate changes are often mentioned in history books as impacting human societies around the world. E.g., Little Ice Age, some desert not being a desert during this period, some region dried up during this period prompting immigration, etc.
So I thought having a comprehensive book on the topic should be nice. I am par... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/8b3pec/are_there_any_good_book_for_layman_about_climate/ | {
"a_id": [
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"score": [
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"text": [
"Although comprehensive only in the sense that it attempts to cover the whole globe across most of the seventeenth century, with special focus on the impact of the Little Ice Age and associated abnormal El Nino episodes, Geoffrey Parker's book *Th... | [] | [] | [
[]
] | |
4gq882 | reverse entropy | Could it ever be possible? Why or why not? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4gq882/elif_reverse_entropy/ | {
"a_id": [
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"text": [
"imagine you have a jar of marbles that you tip over. The marbles all go out in different directions, ricochet off of eachother, and settle. Now, you must put them back how they were before. How? That's impossible, that's so much data to somehow l... | [] | [] | [
[]
] | |
6zgvsl | how do companies like walmart profit from selling gift cards to other services when a gift card costs the amount of credit it's worth? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/6zgvsl/eli5_how_do_companies_like_walmart_profit_from/ | {
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8,
2,
2,
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... | [] | [] | [
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"http://consumersunion.org/research/state-gift-card-consumer-protection-laws-2013-update/"
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1fktav | Why are owls associated with intelligence? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1fktav/why_are_owls_associated_with_intelligence/ | {
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"text": [
"To answer the former question: Athena was the protector of Athens. Athena had an owl because owls were abundant in Athens. There's a proverb that says \"... | [] | [] | [
[],
[
"http://www.britannica.com/EBchecked/topic/436310/owl",
"http://www.macrameowl.com/owl_symbolism.html"
],
[],
[
"http://en.wikipedia.org/wiki/Owl_of_Athena#Greece",
"http://books.google.com.mx/books?id=azCFGSeKjw4C&lpg=PR10&dq=Minerva%27s%20owl%20wisdom&pg=PR10#v=onepage&am... | ||
42j6i5 | sound effects | How do people get the sound effects that can be used in music or movies? Like for an AK47 shootinh do they actually get a mic and just record it, it's hard for me to see them doing that for things like tires screeching or a punch. | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/42j6i5/eli5_sound_effects/ | {
"a_id": [
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"text": [
"Yes, sometimes they just go out to a shooting range or go out driving with a bunch of sound equipment.\n\nUsually for movies they just buy the sound effects from someone who already did that and is selling all the sound effe... | [] | [] | [
[],
[
"http://www.mixonline.com/news/films-tv/matrix-reloaded/369031"
]
] | |
195zt7 | How important are cyanobacteria to *keeping* the earth's atmosphere oxygenated? | I've just been reading about the oxygenation revolution and the 3.5 billion year old fossils of cyanobacteria that may have largely driven that revolution.
But I was wondering if, since oxygen will react with almost anything, and it is difficult to keep it free, if the same cyanobacteria that are alive today play a si... | askscience | http://www.reddit.com/r/askscience/comments/195zt7/how_important_are_cyanobacteria_to_keeping_the/ | {
"a_id": [
"c8lfr0x"
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"score": [
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"text": [
"Indeed, they are very important. [Here](_URL_0_) is a Nat. Geo. article on this very topic (though they are talking about all phytoplankton, but just cyanobacteria). It's a bit old (2004), but still agrees with several other more recent sources... | [] | [] | [
[
"http://news.nationalgeographic.com/news/2004/06/0607_040607_phytoplankton.html"
]
] | |
1wpgez | is it true that if you eat human flesh your body will uncontrollably shake? if so, why? | Curious. Just finished the Book of Eli. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1wpgez/eli5_is_it_true_that_if_you_eat_human_flesh_your/ | {
"a_id": [
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"score": [
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2
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"text": [
"It could happen, yes. It's due to a prion disease called Kuru: _URL_0_",
"Not quite.\n\nTremors from cannabalism is a result of 'Transmissible spongiform encephalopathy', and it results from eating brain tissue that cont... | [] | [] | [
[
"https://en.wikipedia.org/wiki/Kuru_%28disease%29"
],
[]
] | |
3rk4cs | how is the sugar coating on sour candy so much different than table sugar? | [deleted] | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/3rk4cs/eli5_how_is_the_sugar_coating_on_sour_candy_so/ | {
"a_id": [
"cworif0"
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"score": [
3
],
"text": [
"From Wikipedia: *Sour sanding, or sour sugar, is a food ingredient that is used to impart a sour flavor, made from citric or tartaric acid and sugar. It is used to coat sour candies like Sour Patch Kids or to make hard candies tart, such as acid ... | [] | [] | [
[]
] | |
1ivxvy | how are airplanes able to travel through the air despite being heavier than air? also, what exactly is jet propulsion? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1ivxvy/eli5_how_are_airplanes_able_to_travel_through_the/ | {
"a_id": [
"cb8jw0x"
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"score": [
3
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"text": [
"Airplanes fly by generating lift. Their wings are shaped in such a way that when they are moving through the air, the air passing over the top of the wing is moving faster than the air moving under the wing. The faster that air moves, the lower p... | [] | [] | [
[]
] | ||
483ggs | when you forget something, why does retracing your steps often make you remember? (such as going back to a webpage you closed or redoing the activity you were doing) | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/483ggs/eli5_when_you_forget_something_why_does_retracing/ | {
"a_id": [
"d0gzshe"
],
"score": [
2
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"text": [
"For me, it tends to be that something in what I was doing was the impetus for the thought to begin with. When that stimulus occurs again, the thought happens again in the same way it did initially."
]
} | [] | [] | [
[]
] | ||
a8a86r | Is radioactive decay temperature-dependent? | Does the rate of radioactive decay for an isotope vary with temperature? For example uranium-235 has a half-life of 703.8 million years, but would cooling to absolute zero (or very close to absolute zero) have a significant influence of the rate of decay? | askscience | https://www.reddit.com/r/askscience/comments/a8a86r/is_radioactive_decay_temperaturedependent/ | {
"a_id": [
"ec91bix"
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"score": [
27
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"text": [
"Typically is not, the nucleus is so much smaller than the atom that it doesn't \"care\" what's happening around it (imagine a marble at the center of one of those giant human hamster balls). There are maybe a few small exceptions. \n\nOne could ... | [] | [] | [
[
"https://arxiv.org/pdf/0910.4338.pdf"
]
] | |
1w89u3 | batteries: rechargeable vs disposable | What is the difference between the two forms of batteries? Why aren't all batteries rechargeable? wouldn't that be a lot more efficient? | askscience | http://www.reddit.com/r/askscience/comments/1w89u3/batteries_rechargeable_vs_disposable/ | {
"a_id": [
"cezrbbz"
],
"score": [
5
],
"text": [
"Rechargable batteries have different chemistry from disposable batteries. And the different chemistries result in various pros and cons.\n\nA NiMH AA has a voltage of 1.2, but an alkaline AA is 1.5. But most electronics tolerate these small dif... | [] | [] | [
[]
] | |
2kortk | why was microsoft criticised for bundling a browser and media player with their os, but is apple allowed to bundle a computer with their os? | I know the examples are a bit different, but in the end it does constitute product tying, right?
Please, no flaming or brand wars. I'm just curious what the difference is. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2kortk/eli5_why_was_microsoft_criticised_for_bundling_a/ | {
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"text": [
"Microsoft was leveraging its monopoly to put a much smaller rival out of business.",
"The difference is that Windows is very widely ... | [] | [] | [
[],
[],
[],
[],
[],
[]
] | |
20aw9h | why do some nutrition labels read "total carbohydrates 30g" but sugars will say "sugars 22g"? | without any mention of fiber? what/where is the unaccounted 8g of carbs? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/20aw9h/eli5_why_do_some_nutrition_labels_read_total/ | {
"a_id": [
"cg1g3vr"
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"score": [
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"text": [
"Sugars are a simple type of carbohydrate. \n\nFibre (cellulose) is technically a carbohydrate, but it is not digestible and has no direct nutritional value. It is therefore not included in the total carbohydrates of food."
]
} | [] | [] | [
[]
] | |
fuevro | what do the schrödinger and dirac equations describe and what's the difference? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/fuevro/eli5_what_do_the_schrödinger_and_dirac_equations/ | {
"a_id": [
"fme2yi3"
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"score": [
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"text": [
"The Schrödinger equation (ih d/dt psi = H psi) is a very general statement about quantum mechanics: the phase of a state changes (it ”turns”, in a way) proportional to its energy. It can describe many different things as long as you use the corre... | [] | [] | [
[]
] | ||
8hiidl | English (Latin?) certainly made its view of left-handed people clear (sinister - left handed) but are there any cultures were left-handedness is seen as better than right-handedness? | I couldn’t find a more appropriate subreddit and I’ve debated posting it for some half hour now, hope it fits the sub because I’m really curious about this. | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/8hiidl/english_latin_certainly_made_its_view_of/ | {
"a_id": [
"dyk3lql"
],
"score": [
4
],
"text": [
"You might try /r/Askanthropology. There may be someone here with the answer, but this other sub has a concentration of people with a background in comparative ethnography."
]
} | [] | [] | [
[]
] | |
kaocu | obama's new jobs bill. | With a very conservative family I know I'm going to hear nothing but complaining about it in the coming weeks regardless of whether it's good or bad, I'd like to know the real truth. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/kaocu/eli5_obamas_new_jobs_bill/ | {
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2,
29,
2,
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"text": [
"good one! I can't wait for an answer.",
"You can read about it [Right Here](_URL_0_) from a previous ELI5. Cheers.",
"good one! I can't wait for an answer.",
"You can... | [] | [] | [
[],
[
"http://www.reddit.com/r/explainlikeimfive/comments/k9ggy/eli5_obamas_new_job_plan/"
],
[],
[
"http://www.reddit.com/r/explainlikeimfive/comments/k9ggy/eli5_obamas_new_job_plan/"
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356fh1 | what makes the noise in an engine? | Vroom vroom 🚘🚘 | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/356fh1/eli5_what_makes_the_noise_in_an_engine/ | {
"a_id": [
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"score": [
5,
4
],
"text": [
"Its either the engine lifter's noise, valve noise, the combustion, bearing noise, or the exhaust of the car itself you're talking about at the moment.\n\n\nVroom vroom.",
"A short answer: the explosions cause by the spar... | [] | [] | [
[],
[]
] | |
26z988 | what is al qaeda fighting for? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/26z988/eli5_what_is_al_qaeda_fighting_for/ | {
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"http://www.youtube.com/watch?v=95ncn5Q16N4",
"http://youtu.be/UXOslH6aM1E?t=48s"
],
[],
[]... | ||
4gzeho | why does styrofoam melt when it comes into contact with superglue/adhesives? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4gzeho/eli5why_does_styrofoam_melt_when_it_comes_into/ | {
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"text": [
"Super glue and other adhesives contain some organic solvents (e.g. acetone, ethyl acetate). Styrofoam is made from thousands of styrene molecules linked together. Styrene by itself really wants to dissolve in these organic solvents, but since so... | [] | [] | [
[]
] | ||
1y9sro | how do services like pandora and spotify work | I was wondering how a service like Pandora makes money if they have to buy the rights to all of the music that they have. When as far as I know not many people purchase the paid version. Same thing applies to Spotify. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1y9sro/eli5_how_do_services_like_pandora_and_spotify_work/ | {
"a_id": [
"cfikt4r"
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"text": [
"same way any business operates. sell it for more than you buy it.\n\nif it costs $10,000 for Pandora to buy the rights for a song, and they play it on 1million users and get advertising $0.01 per play, then that's profit."
]
} | [] | [] | [
[]
] | |
21c9ta | putting down animals in zoo | why do Zoo put down healthy animals? for example in Denmark recently they put down healthy giraffe and 4 lions
thank you for answer | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/21c9ta/eli5putting_down_animals_in_zoo/ | {
"a_id": [
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"score": [
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"text": [
"Did you read the rest of the article? They explained exactly why they did it.\n\nThey didn't have the money to relocate the animals, and the new animals they were getting would have killed the old animals -- euthanasia makes a little more sense t... | [] | [] | [
[]
] | |
a2ai3x | why is it easier to fall asleep to background noise (radio, tv etc.) than just the plain dark? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/a2ai3x/eli5_why_is_it_easier_to_fall_asleep_to/ | {
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"text": [
"In my experience, a little background noise (white noise) helps cut out any outside noise that might wake you up ",
"This happens because when there's n... | [] | [] | [
[],
[],
[],
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c1abiu | how are amputees able to control the fingers in their bionic arm ? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/c1abiu/eli5_how_are_amputees_able_to_control_the_fingers/ | {
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"Conventional myoelectric prostheses, what 99% of the bionic hands on the market use, are controlled by two inputs. Two sensors on the forearm (in the case of a below elbow ... | [] | [] | [
[],
[
"https://www.youtube.com/watch?v=tCAgGVcxrb8",
"https://en.wikipedia.org/wiki/Electromyography",
"https://www.researchgate.net/profile/Igor_Stirn/publication/254229319/figure/fig3/AS:393234309238792@1470765773723/Energy-envelope-of-the-rectified-EMG-signal-of-LD1-of-three-consecutive-muscle.png"... | ||
fsidc | I have a weird question about micro-gravity. | Testicles use gravity to regulate their temperature by hanging closer or further from the body.
So what happens in space? does it cause discomfort to astronauts?
Also does micro-gravity increases the risk of testicular torsion?
Are 'private' problems caused by space travel documented by space agencies? | askscience | http://www.reddit.com/r/askscience/comments/fsidc/i_have_a_weird_question_about_microgravity/ | {
"a_id": [
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"text": [
"I'll attempt to answer part of this question seriously. I wouldn't know anything about the first two questions, but in terms of the third question you may be interested in [this nice Slate piece](_URL_1_) which has quite a ... | [] | [] | [
[
"http://www.newscientist.com/article/mg15120381.400-space-pregnancy-leads-to-hard-labour.html",
"http://www.slate.com/id/2159265/",
"http://journalofcosmology.com/Mars124.html"
],
[
"http://www.jurology.com/article/S0022-5347\\(07\\)02056-3/abstract"
]
] | |
3srgnb | why haven't we seen the us (and its partners in the fight against isis) engage in a siege of raqqah, the "de facto capital of isis"? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/3srgnb/eli5_why_havent_we_seen_the_us_and_its_partners/ | {
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"text": [
"Isis doesn't wear uniforms, man. They blend in with civilians, that is their defence tactic. Raqqah has a population of like 300k, how many more innocents need to die ?",
"1. Raqqa is surrounded by other territories c... | [] | [] | [
[],
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1lsovb | Was there any ethnic tension between Germans, Slovaks, Slavs, etc... in the early 1900's and leading into the second World War? If so, what was it like? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1lsovb/was_there_any_ethnic_tension_between_germans/ | {
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"text": [
"Of course there was. In the early days of Czechoslovakia, tensions between Czechs and Germans were a major issue that would later play a part in the months preceding the Second World War and the occupation of Czechoslovakia, and that would only b... | [] | [] | [
[]
] | ||
7m4e2p | when did the storefront name of "arcade" go from being a kids' video-game hangout, to being an 18+ slot machine parlour? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/7m4e2p/eli5_when_did_the_storefront_name_of_arcade_go/ | {
"a_id": [
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"text": [
"It happened due to home gaming consoles.\n\nOlder redditor here. I used to play the quarter-munchers back in the days before everyone with teens or kids had at least a couple game consoles... and the earlier generations were really shitty. So you... | [] | [] | [
[]
] | ||
308jls | what is the difference between readings books (any kind) and reading various reddit articles/threads? | Assuming you don't look at any advice animals or funny pics, etc. and it's all reading, what's going on in your head between the two?
Also, besides looking at a screen (blue light) and a physical book. | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/308jls/eli5_what_is_the_difference_between_readings/ | {
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"Reddit posts & articles are usually fairly short. There's not a lot of depth or nuance going on - especially the front page, which is full of image, memes and other such easily digestible things (not to mention all the articles that get commen... | [] | [] | [
[]
] | |
9v7eea | Was Cato the Younger a Pleb or patrician? | Everything I’ve read about him would indicate the later but in 63 BC he was elected to the office of Tribune of the Plebs.
When Clodious , who was from a minor patrician family, was elected to that position only 4 years later, he had to renounce his status and be adopted by a pleb family in a ceremony headed by good ... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/9v7eea/was_cato_the_younger_a_pleb_or_patrician/ | {
"a_id": [
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" > When Clodious , who was from a minor patrician family\n\n*Minor*?! The *gens Claudia* was one of the largest and most prestigious patrician *gentes*, outstripped only in surviving patrician lines by perhaps the *gens Cornelia*. To call Clodius... | [] | [] | [
[
"https://www.reddit.com/r/AskHistorians/comments/3fmn4h/what_was_the_difference_between_patricians_and/ctq0ct3/"
]
] | |
1352eq | Why did the Irish Rebellion in 1798 fail? | compared to the American revolution and the French revolution which both succeeded, why did the Irish revolution fail ? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1352eq/why_did_the_irish_rebellion_in_1798_fail/ | {
"a_id": [
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"In short (don't have much time, so perhaps someone can expand on this)\n\n1. Three of the United Irishmen's top brass were arrested on the eve of the uprising.\n\n2. Artillery stationed in Ireland had been upgraded and increased in size. One Lieu... | [] | [] | [
[]
] | |
b5s4wd | why can paying off your student loans hurt your credit score? it seems like it would be a good thing. | Any information that would help explain credit scores would be very much appreciated. | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/b5s4wd/eli5_why_can_paying_off_your_student_loans_hurt/ | {
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"Part of a credit score is being able to prove you can pay off debt, which requires having debt to begin with. Tha... | [] | [] | [
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cbefmn | What was the primary warship of the Indian Ocean before the advent of the modern period? | So I've been curious to how naval warfare was conducted in the Indian Ocean as I'm only familiar with the calm-water war galleys, and the modern era sailing ships of Europe.
& #x200B;
I've read that the Arabs and Indians used the Dhow to transport goods, but was there something like the War Dhow? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/cbefmn/what_was_the_primary_warship_of_the_indian_ocean/ | {
"a_id": [
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"text": [
"One particular aspect of maritime situation in the Indian ocean in the second half of fifteenth century which is often emphasized by scholars, is the *relative* peacefulness and *absence* of large scale naval conflicts. The... | [] | [] | [
[
"https://imgur.com/djTG7mv.jpg",
"https://imgur.com/wZNkfNW.jpg",
"https://imgur.com/JUjFAuU.jpg"
],
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"http://www.indiandefencereview.com/wp-content/uploads/2017/08/Maratha-Ship-Gurab.jpg",
"https://books.google.co.in/books?id=bxsa3jtHoCEC&pg=PA99&dq=kanhoji+Angre+guns+boat&hl... | |
2ppwgh | when i'm tired, every now and then i will go through bouts of extreme drowsiness where i can't even keep my head up and eyes open, but after about 5-10 minutes i am awake again and completely fine. what are these cycles and how do they work? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2ppwgh/eli5when_im_tired_every_now_and_then_i_will_go/ | {
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"http://en.wikipedia.org/wiki/Liminality"
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2olx19 | suitjacket, sportcoat, and blazer? which situation calls for which jacket? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2olx19/eli5_suitjacket_sportcoat_and_blazer_which/ | {
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"text": [
"Sport coats have patterns, unlike blazers, which are solid and have contrasting buttons. Suit jackets are smooth, have tonal buttons, and should never be wo... | [] | [] | [
[],
[],
[],
[],
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] | ||
3yvmjh | why are so many large companies headquartered in minneapolis? | A handful of people have asked before about Silicon Valley, or NYC... Those places make sense, because of the reputation and availability to network. But nobody (at least, nobody I've asked about this) think "Oh, best place for corporate headquarters? Obviously Minnesota."
Even southern regional staples like Dairy Que... | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/3yvmjh/eli5_why_are_so_many_large_companies/ | {
"a_id": [
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"score": [
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"text": [
"Minneapolis has a well educated population, the standard amenities of a major city, is a hub for a major airlines, has a high livability index, and still maintains a relatively low cost of living compared to other major cities."
]
} | [] | [] | [
[]
] | |
a88scv | why are b.c. (before christ) and a.c. (after christ) the reference points we have chosen to use for historical measure, as opposed to any other major historical event? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/a88scv/eli5_why_are_bc_before_christ_and_ac_after_christ/ | {
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"text": [
"Nowadays you often see “BCE” which stands for “Before the Common Era.” “BC/AC” was just a handy reference since many Western historians were/ are Christian. ",
"In the rest of the non-Christian wor... | [] | [] | [
[],
[],
[]
] | ||
7h4fr1 | if most psychopaths become psychopathic due to their childhood or a birth defect, why are most psychopaths male? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/7h4fr1/eli5_if_most_psychopaths_become_psychopathic_due/ | {
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3,
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"text": [
"Because contrary to what you might have been told, gender is not actually a social construct. Our brains are wired differently, and when they malfunction, they malfunction in diff... | [] | [] | [
[],
[],
[],
[]
] | ||
7o96qt | What problems was fascism intended to solve? | Or to put it differently, what account did the fascists give of their policies? To clarify, I'm referring to the Italian political movement, not the Nazis; and their specific policies, the nuts-and-bolts of their administration, not their overarching goal of "make the nation strong". What problems did they identify in ... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/7o96qt/what_problems_was_fascism_intended_to_solve/ | {
"a_id": [
"ds7v0m6",
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"score": [
30,
30
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"text": [
"Hi there. There's always room for more discussion (and follow-up questions) but you might be interested in [this older answer of mine](_URL_0_) about the prelude to Mussolini's rise. [This great answer](_URL_1_) by u/Kles... | [] | [] | [
[
"https://www.reddit.com/r/AskHistorians/comments/49g1wb/what_led_to_the_rise_of_mussolini_how_did_he/d0s5dpm/",
"https://www.reddit.com/r/AskHistorians/comments/4a7b0f/mussolini_was_made_prime_minister_in_1922_at_what/d0y4koe/"
],
[]
] | |
4ca43l | Why is it that the inside of fresh water pipes that feed houses don't need regular cleaning? | askscience | https://www.reddit.com/r/askscience/comments/4ca43l/why_is_it_that_the_inside_of_fresh_water_pipes/ | {
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2,
14,
2
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"text": [
"They need. If you use a pipe system for 20+ years there is gonna be a lot of build up. Most of the time its not necessery bad.\nThe thing is nobody thinks ab... | [] | [] | [
[],
[],
[],
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] | ||
a9k4bp | what makes our ears ‘clog’ in high altitudes and what makes them pop by yawning? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/a9k4bp/eli5_what_makes_our_ears_clog_in_high_altitudes/ | {
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"eck30ug",
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"score": [
2,
2,
9
],
"text": [
"Im pretty sure when there’s low air pressure it messes around with how your inner ear functions and yawning sorta stretches it making it “pop”.",
"Air in your middle ear is at a higher pressure than... | [] | [] | [
[],
[],
[]
] | ||
3ca9h5 | Imagine an empty room with no windows/doors or any point of entry and escape with just a light bulb inside and a light switch outside. What will happen to light if I open the light for 10 seconds and turn the switch off? Will the brightness remains or will fade? Why? | askscience | http://www.reddit.com/r/askscience/comments/3ca9h5/imagine_an_empty_room_with_no_windowsdoors_or_any/ | {
"a_id": [
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"text": [
"The light will fade almost instantly. As the light strikes the wall, part of it is reflected and part of it is absorbed. The reflected light will bounce away from the wall until it hits another wall (or floor/ceiling) and th... | [] | [] | [
[],
[]
] | ||
8y3rcf | why are surgical gowns, masks, and gloves green or blue? | Wouldn't white be a better color since doctors usually wear a white coat and white provides better contrast with red color of blood. | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/8y3rcf/eli5_why_are_surgical_gowns_masks_and_gloves/ | {
"a_id": [
"e27w05a",
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"score": [
4,
2
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"text": [
"They used to be white. There's a sort of 'surgeon legend' about the green being used because it was easier to see in a surgical field (brightly lit + whites = too bright). But then also that green/blue is actually opposite r... | [] | [] | [
[],
[]
] | |
32eegb | In medieval times, how long could a knight physically fight in a battle? The swords were heavy, the armor was heavy. Nutrition was poor. Could they last more than 30 minutes? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/32eegb/in_medieval_times_how_long_could_a_knight/ | {
"a_id": [
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"text": [
"This doesn't directly answer the question, but I think you may be overestimating the weight carried/worn by a knight.\n\nThe average sword weighed somewhere around 3lbs, an M16 with full ammo weighs about 9lbs.\n\nA suit of... | [] | [] | [
[],
[
"http://www.washingtonpost.com/wp-dyn/content/article/2009/01/31/AR2009013101717.html",
"http://www.reddit.com/r/AskHistorians/comments/275iz3/in_shows_like_game_of_thrones_characters_wear/"
]
] | ||
5ol96w | If I were to travel ten light years going the speed of light, would it seem like an instant to me, but ten years for an outside observer? | I've recently been obsessed with anything discussing Einstein's relativity equations. This concept is by far one of the most intriguing. That is, if I am understanding it correctly. I'm posting this just for clarification if it is true that going any distance at the speed of light is instantaneous to the object traveli... | askscience | https://www.reddit.com/r/askscience/comments/5ol96w/if_i_were_to_travel_ten_light_years_going_the/ | {
"a_id": [
"dckl8mm",
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"score": [
19,
3
],
"text": [
"You *cannot* travel *at* the speed of light, so this question becomes pseudo-scientific.\n\nBut let's say you were travelling *really* close to the speed of light. Like *really, really* close. Like 99.999...999% with a bill... | [] | [] | [
[],
[]
] | |
7mgcxp | How does pilot wave theory account for quantum fluctuations? | From what I understand, pilot wave theory assumes the uncertainty principle to be a flaw in measurement instead of a fundamental "property" of particles. (correct me if I am wrong)
Quantum fluctuations are the result of the uncertainty principle, these fluctuations can be observed and modeled.
How does pilot wave th... | askscience | https://www.reddit.com/r/askscience/comments/7mgcxp/how_does_pilot_wave_theory_account_for_quantum/ | {
"a_id": [
"drtvu9m",
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"score": [
2,
2
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"text": [
"The guided particle doesn't move through space, it moves through the space of possible positions of all particles, which instead of just 3 dimensions has 3N dimensions, where N is the number of particles. The positions of pa... | [] | [] | [
[],
[]
] | |
bud7iq | AskScience AMA Series: I am Jamil Zaki, professor of psychology at Stanford University and director of the Stanford Social Neuroscience Lab. I wrote a book called The War for Kindness, which shares stories and research about how to fight for empathy even when it feels impossible to some days. AMA! | Hi Reddit! I’m Jamil Zaki, a professor of psychology at Stanford University and head of the [Stanford Social Neuroscience Lab](_URL_3_). My first book, called [The War for Kindness](_URL_2_), comes out next week!
For the last fifteen years, I’ve studied empathy—people’s ability to share, think about, and care abou... | askscience | https://www.reddit.com/r/askscience/comments/bud7iq/askscience_ama_series_i_am_jamil_zaki_professor/ | {
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"epbc3pr",
"epbe1ds",
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"epbf8hb",
"epbfujh",
"e... | [] | [
"https://twitter.com/zakijam/status/1131953030461394944",
"https://www.penguinrandomhouse.com/books/550616/the-war-for-kindness-by-jamil-zaki/",
"https://www.amazon.com/War-Kindness-Building-Empathy-Fractured/dp/0451499247/ref=tmm_hrd_swatch_0?_encoding=UTF8&qid=1547223297&sr=8-1",
"http://ssnl.stanfo... | [
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19thn7 | Does Anybody have any information on the "Phantom Divisions" of the United States Army during World War II? (Cross Posted From r/Military) | I cannot find a whole lot of information about them. Just to name a few:
6th Airborne
9th Airborne
15th Armored
38th Armored
11th Infantry
157th Infantry
5th Motorized
I came across the 9th Airborne while reading an article; upon doing some research I found upwards of thirty "Phantom Divisions." I'm just curio... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/19thn7/does_anybody_have_any_information_on_the_phantom/ | {
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"Could they be similar in role to the [Ghost Army](_URL_0_)?"
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6qrwya | why does it seem easier to get stuck in a comfort zone as an adult? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/6qrwya/eli5_why_does_it_seem_easier_to_get_stuck_in_a/ | {
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"In the old days, life changed very slowly. The way the world worked when you were 5 years old was the same when you were 75 years old. So by the time you had reached adulthood you pretty much had figured out what there was to figure out."
]
} | [] | [] | [
[]
] | ||
12ztqx | Constellations disappearing: | Hey how long until our beloved constellation disappear from our sky? Big dipper ( Plough) seems to missing a star tonight. | askscience | http://www.reddit.com/r/askscience/comments/12ztqx/constellations_disappearing/ | {
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"Stars rarely just go missing, but the constellations will change over time due to stars moving at different velocities. Here's [what some of them will look like in 50,000 years](_URL_0_).",
"If it's a particularly bright... | [] | [] | [
[
"http://news.discovery.com/space/changing-constellations-50000-years.html"
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a0s2ct | Why did Britian use the bolt action Lee-Enfield as their primary battle rifle when repeating technology (M1 Garand, Gewehr 41, etc) was already developed and working? | I get that the Arisaka and Mosin-Nagant were also bolt action, so it's not like repeating clip-fed rifles were the world standard by any means. It's just that given that Britain was a powerful empire at the time, you'd think that their firearms technology would be sort of top of the line you know?
Also, I'm not shitt... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/a0s2ct/why_did_britian_use_the_bolt_action_leeenfield_as/ | {
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"hey, sorry for the very late answer, i hope i don't break any rules by digging up old unanswered questions.\n\nTo answer this question you have to understand how the adoption of a self loading rifle would have worked in britain in the 1930's. \n\... | [] | [] | [
[]
] | |
nvxvz | conservation of mass says matter can't be created nor destroyed. do we have any theory of how this fundamental law was originally ignored to create the big bang? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/nvxvz/eli5_conservation_of_mass_says_matter_cant_be/ | {
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"The original question not entirely accurate. Mass/energy (they are the same thing) cannot be created or destroyed, but mass *can* be turned into energy, and vice versa. \n\nNuclear reactions attain their vast energy outputs ... | [] | [] | [
[],
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] | ||
el8qip | The Norse people were shown to be capable raiders, especially in the British Isles. The Anglo-Saxons despite divided were socially and militarily organised, why did they, or others, never seek or attempt to attack Scandinavia? | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/el8qip/the_norse_people_were_shown_to_be_capable_raiders/ | {
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"I afraid that I cannot offer a single definitive answer to 'why X didn't Y' type question of OP. Instead I'll make some corrections to OP's premise below. \n\nFirst of all, there was no known unified large-scale kingdom in Scandinavia before th... | [] | [] | [
[
"https://www.reddit.com/r/AskHistorians/comments/cvzcjo/the_danes_or_vikings_from_later_denmark_would/"
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1f7823 | What happened to Dutch painting in the 18th century? | Last week I visited the Rijksmuseum and grew interested in Dutch masters and the history of art in the Netherlands. I noticed that both wikipedia and the Rijksmuseum website skip the 18th century in the chronology of painting in the Lowlands without any explanation.
A bit of google later I'm still without a satisfyin... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1f7823/what_happened_to_dutch_painting_in_the_18th/ | {
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"Apparently during the 18th century the Dutch Republic was seen as being in a decline. Instead of commissioning new works by comtemporary artists, patrons preferred to obtain works from the Golden Age, when their country was more stable and prosp... | [] | [] | [
[]
] | |
5m4mzf | how does an led change colors? | Is there any mechanical or physical change? Are there multiple different colored LEDs in each "bulb" that are illuminated in various configurations to produce each color (similar to an RGB display)? Or can one unit actually produce light of variable wavelengths? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/5m4mzf/eli5_how_does_an_led_change_colors/ | {
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1k5iqn | How will it affect US economy if bill gates were to transfer all his money to some other country ? | askscience | http://www.reddit.com/r/askscience/comments/1k5iqn/how_will_it_affect_us_economy_if_bill_gates_were/ | {
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"The exact disposition of Bill Gates' personal wealth isn't information we can get our hands on, since he's a private citizen and it's none of our business. So instead let's make up a person with the same order of magnitude of wealth, imagine how ... | [] | [] | [
[]
] | ||
awghnc | Is there a way to conceptualise complex integration? | So I understand real integration fine and I think this is because I think very visually and it is very easy to do this with real integration as its area. Today though I started to play around with complex integration and I'm starting to realise I can't use the same area trick anymore... I think. This confusion is stemm... | askscience | https://www.reddit.com/r/askscience/comments/awghnc/is_there_a_way_to_conceptualise_complex/ | {
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"In complex analysis, an integral is less like the \"Finding the area under a graph\" integral of calc 1, and more like the line integrals of vector fields in calc 3. These path independence results are actually there in norm... | [] | [] | [
[],
[]
] | |
3impk0 | cannabis strains classification. | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/3impk0/eli5_cannabis_strains_classification/ | {
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"It's both. There's a classification system to differentiate between plants, and from the same family of plants.\nAnd with cannabis, naming the strains means that you can get the sa... | [] | [] | [
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3bpxp5 | Why are siphonophorae considered "colony organisms"? What's the difference between a morphologically specialized zooid and an organ? | Why was a distinction needed? The zooids share the same DNA, comes from the same egg, are non-mobile respectively to one another and are incapable of surviving on their own.
(and even if some segments of their organisms were able to survive and regrow if cut from the rest of the body, the starfish, which aren't conside... | askscience | http://www.reddit.com/r/askscience/comments/3bpxp5/why_are_siphonophorae_considered_colony_organisms/ | {
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"text": [
"the distinction is made based on the origin of the zooids\n\nin everything from a fruit fly to a human the first fertilized cell divides many times into a mass of cells, aligns itsself along some gradient and develops bands ... | [] | [] | [
[],
[]
] | |
1v19bw | Historians, how many of you speak/ have fluency in languages relevant to your areas of study? How important would knowledge of such relevant languages be to you? | Mods, sorry if this violates the "no poll questions" rule, but I'm interested to know how many professional historians actually do speak relevant languages. I'm not so interested in people studying european history- mostly, I'm curious about people like /u/Qhapaqocha, our andean specialist, and others who work in field... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1v19bw/historians_how_many_of_you_speak_have_fluency_in/ | {
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"Before I refocused myself into Early Modern France, I was aiming to be a Classicist with a focus in the Late Roman Republic, so I had to learn Latin and Ancie... | [] | [] | [
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4uxjwq | why airlines don't sell empty seats on flights at cheap rates | I was at the airport recently waiting for my flight, and looked up prices for last minute tickets as it was relatively empty - they were all over $500. So it got me thinking, why would an airline rather not fill the seats, than to sell them at deeply discounted rates? Is the actual cost of transporting a person on a p... | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4uxjwq/eli5_why_airlines_dont_sell_empty_seats_on/ | {
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"Because people who purchase tickets last minute usually *have* to travel and will pay the full price.\n\nIt's rare that a plane will be relatively empty. Whe... | [] | [] | [
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1c07io | Part 1: What causes a person with Tourette's to shout obscenities? Part 2: What would happen if they never learned any curse words? | askscience | http://www.reddit.com/r/askscience/comments/1c07io/part_1_what_causes_a_person_with_tourettes_to/ | {
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"I would just like to point out that not all verbal tics are curse words— [here is an article about a woman with Tourette's Syndrome who involuntarily says the word \"biscuit\" ~900 times an hour.](_URL_0_) The article also mentions that\n\n > \"F... | [] | [] | [
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"http://abcnews.go.com/Health/tourettes-syndrome-woman-biscuit-16000-times-day/story?id=17344295#.UWRgias8Qi8"
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ekuabf | why can't we use the ocean to dump onto fires? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/ekuabf/eli5_why_cant_we_use_the_ocean_to_dump_onto_fires/ | {
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2tt0j9 | Tuesday Trivia | Missing and Destroyed Documents | (going to be out tomorrow so this is going up a little early - enjoy your extra time to write beautiful historical essays!)
[Previous weeks' Tuesday Trivias and the complete upcoming schedule.](_URL_0_)
Today’s trivia theme comes to us from /u/Artrw!
As an archivist, it pains me to admit this, but sometimes humani... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/2tt0j9/tuesday_trivia_missing_and_destroyed_documents/ | {
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319yt6 | To what extent was the Japanese government aware of the Manhattan project or similar nuclear weapons project prior to the deployment of the nuclear bombs during WWII? Was there any awareness that such a thing was possible? | Basically - Did the Japanese have any idea that the Americans were working on a superweapon project? For that matter, did the Russians or the Germans? Was there an understanding among world governments that such a thing might be possible or was it completely unexpected? | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/319yt6/to_what_extent_was_the_japanese_government_aware/ | {
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"Practically all physicists knew that atomic bombs were theoretically possible after the discovery of nuclear fission and the nuclear chain reaction in the early months of 1939. Most thought that they were a technology that was not going to emerge... | [] | [] | [
[
"http://blog.nuclearsecrecy.com/2013/09/13/what-did-the-nazis-know-about-the-manhattan-project/"
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mrfm6 | What causes absorption of right- or left- circularly polarized light by chiral molecules? | I am trying to understand this and having a hell of a hard time. Specifically, infrared radiation for Vibrational Circular Dichroism. I understand the principles of light absorption and re-emission, but I can't pin down why a chiral molecule would preferentially absorb one type of circularly polarized light and not the... | askscience | http://www.reddit.com/r/askscience/comments/mrfm6/what_causes_absorption_of_right_or_left/ | {
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"text": [
"The difference between molecules of left and right chirality is exactly the same as the difference between left and right circularly polarized light- a mirror symmetry.\n\nThe reas... | [] | [] | [
[],
[],
[],
[]
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a9a2rj | [META] Merry (UTC) Christmas and Happy Holidays to AskHistorians! As an extra-special gift from the Asia flairs, we've completely revamped our book recommendation list! Links below! | The title has quite obviously given away the point of this post, which is to announce our shiny, new and improved Asia book list! Over the course of the past four months, the flair panel has been collaborating on creating a new list to take advantage both of the expertise of the current panel and certain features of th... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/a9a2rj/meta_merry_utc_christmas_and_happy_holidays_to/ | {
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"Now we get to the comments thanking the contributors to the list. Firstly, I’d like to give special thanks to three flairs whose contributions are not (at pre... | [] | [
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"https://www.reddit.com/r/AskHistorians/wiki/books/southasia",
"https://imgur.com/V1vAZI6",
"https://imgur.com/hnjlBTj",
"https://www.reddit.com/r/AskHistorians/wiki/books/eastasialegacy",
"https://www.reddit.com/r/AskHistorians/wiki/books/sou... | [
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2yesv7 | does piracy actually hurt the profit of corporations? | I'm going to assume you all the know the normal arguments from both sides. But is there any hard data on this subject? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2yesv7/eli5does_piracy_actually_hurt_the_profit_of/ | {
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"If any brainy person with data can answer this well, I hope they also take into consideration the affect of franchise knock-on, which is often not discussed. And arguably makes up a larger long term profit and vertical integration, or market syne... | [] | [] | [
[]
] | |
44tvzf | Why does male pattern baldness follow the pattern it does? i.e. from the top of the head down, often in a perfectly straight circle around the head. | I'll be more specific. Why for example does it not start from the collar and work up leaving an island on the top? Or why not just the sides leaving a Mohawk? It's some variation of mid-line top then down. It always ends up in a horseshoe around the head. | askscience | https://www.reddit.com/r/askscience/comments/44tvzf/why_does_male_pattern_baldness_follow_the_pattern/ | {
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"It doesn't. Sometimes the hair line recedes all the way to the back of the head, sometimes a bald spot appears on top of the head and increases in diameter over time. \n\nSometimes there is even a patch at the front that is ... | [] | [] | [
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"https://media.licdn.com/mpr/mpr/shrinknp_800_800/AAEAAQAAAAAAAAaiAAAAJGE1MGYzZjRlLWQyYWItNDc5Ny1hNzAwLTI1N2U5OTQwMDEzOQ.png"
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7pxblx | how did some neighborhoods in america came to be known as 'black neighborhoods'? is it mainly because of segregation? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/7pxblx/eli5_how_did_some_neighborhoods_in_america_came/ | {
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"Housing segregation enforced by redlining and blockbusting and white flight. \n\nSo, you take a neighborhood, and you line it. Red lines are where black people are able to live. Ba... | [] | [] | [
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xji30 | why were african, australian and native american civilisations so technologically inferior compared to european and east asian civilisations? | Thanks for the answers Reddit, most of them tell me to read "Guns, Germs and Steel" which I'll definitely buy once my exams are over.
So to summarise:
* Similar climate encouraged trade of farming techs/animals etc.
* Domesticated animals
* Close proximity of groups of people encouraged competition and a military ... | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/xji30/why_were_african_australian_and_native_american/ | {
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t3k4u | When I donate blood, I sometimes wonder: What happens if the blood recipient is allergic to something I recently ate? | Do the allergens make it into the blood stream or does the digestive system destroy any molecules that could create an allergic reaction? | askscience | http://www.reddit.com/r/askscience/comments/t3k4u/when_i_donate_blood_i_sometimes_wonder_what/ | {
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"Food allergies typically act on tissues the food encounters before digestion, such as the oral and esophageal mucosa, resulting in swelling or rashes of the throat leading to cons... | [] | [] | [
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1x9p9x | what exactly does this mean (pic in post)? | _URL_0_ | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/1x9p9x/eli5_what_exactly_does_this_mean_pic_in_post/ | {
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"In some locations, failing to upkeep a property means it can be forfeited to a new owner who does want to care for the property. The sign was posted by essentially squatters who want to prove no one cares for the property. \n\nIts called adverse... | [] | [
"http://i.imgur.com/1ZirFkV.jpg"
] | [
[]
] | |
2d8v8u | why does my cat insist on having me constantly feed him, even though he still has food in the bowl? | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2d8v8u/eli5_why_does_my_cat_insist_on_having_me/ | {
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"text": [
"Cats are assholes?",
"My cat literally meows for me to watch him eat. I'll be in my room and will hear him meowing from downstairs so I'll go down thinking he wants me to let... | [] | [] | [
[],
[],
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3c3uk0 | swingset physics | ... and then maybe like I'm 40 afterwards :) | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/3c3uk0/eli5_swingset_physics/ | {
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"In the absence of friction (or other energy sinks), a swingset, or indeed any simple pendulum, would simply continue to oscillate indefinitely between the two high points. At one extreme, when the pendulum is highest and its speed zero, the syste... | [] | [] | [
[]
] | |
3apep9 | Which planet, if it disappeared, would affect Earth the most? | askscience | http://www.reddit.com/r/askscience/comments/3apep9/which_planet_if_it_disappeared_would_affect_earth/ | {
"a_id": [
"cses0ti"
],
"score": [
36
],
"text": [
"If Jupiter were to magically disappear I expect we'd quickly be exterminated by an asteroid impact. \n\nThe solar system is, to first order, the sun. Pretty much everything that goes on can be pretty thoroughly described if you just know the dis... | [] | [] | [
[
"https://upload.wikimedia.org/wikipedia/commons/f/f3/InnerSolarSystem-en.png",
"http://www.exploremars.org/wp-content/uploads/2013/06/Petr-Sheirich-2005-our-solar-system-in-motion.gif",
"http://www.ifa.hawaii.edu/images/sl9/io.gif"
]
] | ||
2h4ar2 | how do we know that we 'mixed' with other human species? | I was reading about it on [this Wiki page](_URL_0_) but I have difficulties understanding.
Thanks! | explainlikeimfive | http://www.reddit.com/r/explainlikeimfive/comments/2h4ar2/eli5_how_do_we_know_that_we_mixed_with_other/ | {
"a_id": [
"ckp8wbt"
],
"score": [
2
],
"text": [
"Scientists are able to analyze DNA and determine your ancestors. Certain areas/species have specific genes, and we have recently discovered Ozzy Osborn has traces of Neanderthal heritage: _URL_0_\n\nThat's how we \"know\". But evolution occurs at... | [] | [
"http://en.wikipedia.org/wiki/Archaic_human_admixture_with_modern_humans"
] | [
[
"http://www.scientificamerican.com/article/ozzy-osbourne-genome/"
]
] | |
2isdqh | If one clock orbits Earth moving very fast, why does it measure less time when, relative to the orbiting clock, Earth-bound clocks are moving equally fast? | askscience | http://www.reddit.com/r/askscience/comments/2isdqh/if_one_clock_orbits_earth_moving_very_fast_why/ | {
"a_id": [
"cl5dsrv"
],
"score": [
2
],
"text": [
"See the [Wikipedia article for twin paradox](_URL_0_), specifically the resolution part."
]
} | [] | [] | [
[
"http://en.wikipedia.org/wiki/Twin_paradox"
]
] | ||
65s86q | During the Holocaust what was the difference between the death camps and the work camps? Also how was it decided who went where? | I'm interested in exactly how the camps operated differently from each other. Also were people separated based on age/health/capability or was it purely based on religion and ethnicity or perhaps geographical proximity? Additionally why did the Nazis have extermination camps at all? It seems like working people to deat... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/65s86q/during_the_holocaust_what_was_the_difference/ | {
"a_id": [
"dgcw923",
"dgoswby"
],
"score": [
2,
2
],
"text": [
"_URL_0_\n\nu/commiespaceinvader answered a lot of my questions in this post, but I'm still unsure of how it was decided who went to what camp",
"Good question! I hope that you read the link given in another answer and t... | [] | [] | [
[
"https://www.reddit.com/r/AskHistorians/comments/4nz0tk/why_didnt_hitler_wait_until_after_world_war_ii_to/"
],
[
"https://www.reddit.com/r/AskHistorians/comments/47sgtq/why_is_auschwitz_the_archetypal_concentration_camp/"
]
] | |
3ga74o | A friend of mine tells me every culture around the world has a myth of a great flood wiping out the whole world, and that the timelines match up indicated they are talking about the same flood. How true is this likely to be? | A friend of mine tells me that every culture has a myth about the great flood that wipes out the entire world. To me it seems obvious that since they only had access to their local area, and since at some point throughout history most local areas will flood, we would have no way to tell if they were really talking abou... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/3ga74o/a_friend_of_mine_tells_me_every_culture_around/ | {
"a_id": [
"ctwa4zo",
"ctwl55s"
],
"score": [
56,
13
],
"text": [
"[Mark Isaak has collection about a gazillion flood stories.](_URL_0_) That is a lot, but not every country has one. Nor is there all that much similarity across the stories. Boats are common, but you expect boats in a floo... | [] | [] | [
[
"http://www.talkorigins.org/faqs/flood-myths.html",
"https://en.wikipedia.org/wiki/Black_Sea_deluge_hypothesis"
],
[
"https://upload.wikimedia.org/wikipedia/commons/c/c6/Great_Australian_Bight_Marine_Park.jpg"
]
] | |
f916g4 | How can I learn history on my own and take steps to be a buff? | I am a 17 year old still in high school and I am so fascinated with history. I took a world history class last year but the teacher did not really teach in depth and skipped a lot. Now I am taking US history I am loving this class and the teacher.
I want to learn the history of the world that I never truly got to le... | AskHistorians | https://www.reddit.com/r/AskHistorians/comments/f916g4/how_can_i_learn_history_on_my_own_and_take_steps/ | {
"a_id": [
"fioy8xe",
"fip8voj",
"fipaviq",
"fipvvmz"
],
"score": [
6,
5,
7,
2
],
"text": [
"That’s a pretty broad spectrum. Are there any events, eras, or regions that you find most interesting.\n\nThe sub has a series of book recommendations for all sorts of topics, bro... | [] | [] | [
[],
[],
[],
[]
] | |
1s9hx4 | Why were (or even how) the battle tactics of Mesoamerican peoples so different from those of the old world at the time of contact? | Some reasons given to the Spanish Conquest is that the battle tactics of the Aztec differed greatly from the Europeans. Namely, that Aztecs were looking to gain captives in combat, and that cities were not prepared for the sort of European 'siege warfare'.
I understand some of the obvious differences (such as the adva... | AskHistorians | http://www.reddit.com/r/AskHistorians/comments/1s9hx4/why_were_or_even_how_the_battle_tactics_of/ | {
"a_id": [
"cdvc5a3"
],
"score": [
7
],
"text": [
"The idea that the \"Aztecs were looking to gain captives in combat\" is really quite overblown. While the taking of prisoners was important for advancement in social and military rank, the number of prisoners to gain high status was quite small -... | [] | [] | [
[
"http://www.reddit.com/r/AskHistorians/comments/1coe7f/siege_warfare_in_precolombus_americas_how/c9ixz4h",
"http://www.reddit.com/r/AskHistorians/comments/1lq5ma/military_capabilities_of_precolombian_mesoamerica/cc3csj7"
]
] | |
48vw38 | why flight attendants close the windows during the night? | I've been to a lot of flights and this happens all the time. | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/48vw38/eli5_why_flight_attendants_close_the_windows/ | {
"a_id": [
"d0n02k7",
"d0n14cd"
],
"score": [
5,
2
],
"text": [
"So people can sleep. Night destination-time may not correspond to night at the longitude the plane is currently over. For example, you may be arriving in Europe early in the morning, but flying partially during daytime.",
... | [] | [] | [
[],
[]
] | |
g2skw | Does metric expansion of the universe apply to the dimension of time? If not, why not? | askscience | http://www.reddit.com/r/askscience/comments/g2skw/does_metric_expansion_of_the_universe_apply_to/ | {
"a_id": [
"c1khwcn",
"c1khyv4",
"c1ki2b4",
"c1ki4jz",
"c1kia21"
],
"score": [
5,
2,
12,
27,
75
],
"text": [
"If you look at the equations:\n_URL_1_\n_URL_0_\n\nYou will see the scale factor does not apply to time. ",
"It appears that space/time could be expan... | [] | [] | [
[
"http://en.wikipedia.org/wiki/Friedmann_equations",
"http://en.wikipedia.org/wiki/Friedmann-Lema%C3%AEtre-Robertson-Walker_metric"
],
[],
[
"http://www.physicsforums.com/showthread.php?t=71053"
],
[],
[]
] | ||
4iat99 | why do most power plants convert heat into electricity by heating water into steam and then using it to spin a turbine? is there not a more efficient way to do it? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/4iat99/eli5_why_do_most_power_plants_convert_heat_into/ | {
"a_id": [
"d2wiqm8",
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"d2wjitw",
"d2wjsva",
"d2wjyxl"
],
"score": [
5,
21,
13,
5,
2,
5
],
"text": [
"None that we've found. There are ways to make the process more efficient, but nothing can reliably keep the turbines spinning at maxim... | [] | [] | [
[],
[],
[],
[],
[
"http://www.brighthubengineering.com/power-plants/72369-compare-the-efficiency-of-different-power-plants/"
],
[]
] | ||
5xfnjw | what is the significance of having headphones in the correct ears when listening to music? | explainlikeimfive | https://www.reddit.com/r/explainlikeimfive/comments/5xfnjw/eli5_what_is_the_significance_of_having/ | {
"a_id": [
"dehpr9x"
],
"score": [
5
],
"text": [
"There isn't one from a music perspective, (some songs have differences in the left-right channel, but it doesn't really matter if it is reversed). The problem is with the shape of the headphones themselves. The right headphone is shaped for the r... | [] | [] | [
[]
] |
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