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l5kvgs
What's so bad about the jungle cruise at disneyland?
Other
explainlikeimfive
[ "gkuswwk" ]
[ "It features characters and animatronics that are based on outdated views of native or indigenous people. They are usually depicted as primitive attackers or cannibals, and not really shown so much to just be people. It's just not in line with how a politically correct society views the idea of tribal cultures and religious beliefs and lifestyles." ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
hxj5wi
If motion causes friction, and friction causes heat, why does wind (which is air in motion) get colder the faster it blows?
Physics
explainlikeimfive
[ "fz6gmjl", "fz6uhuw", "fz6gl58", "fz7014d" ]
[ "You’re right, it does have friction which produces heat but this is minimal compared to the cooling effect. Wind blows away the warm air from the surface of our skin and helps our sweat to evaporate (I’ll write at the end why this helps) and these effects are larger than that of the friction. Tangent: sweat evaporating cools us down because the molecules with the most energy (heat) evaporate first, thereby taking away more than their fair share of heat, hence the average temperature of the sweat decreases. Edit: you’ve probably seen the extreme effects of friction from the air when seeing things enter the atmosphere in films." ]
[ 68 ]
[ [], [], [], [] ]
[ "url" ]
[ "url" ]
ch2reh
What is code and why is a lot of it in 0’s and 1’s?
Technology
explainlikeimfive
[ "euoclns", "euoam0e", "euoadhi" ]
[ "This is a really complicated question, but I'll try to answer it as briefly as I can. Your computer is very much a kind of electrical machine, that manipulates the voltages of different wires, and is designed to preform calculations on those voltages. Scientists realized pretty early on in computer science, that a simple cost effective way to build computers was to use only two different voltage levels to represent different values, a high level and a low level. With just two voltages, you can represent numbers by encoding them into a number system called binary. In binary, we use the number 0 to represent a low voltage and 1 to represent a high voltage. With just one digit you can only have two numbers 0 and 1, but if you have more digits then you can have bigger numbers. In binary 0, 1, 2, 3, 4, 5, 6, 7... gets converted to 0, 1, 10 (we added another digit for 2 because we ran out), 11, 100, 101, 110, 111... Once you can represent numbers in a computer, you can store other kinds of data by mapping the numbers to a code. For example if you want to represent the alphabet, you could make 0 a space, 1 the letter a, 2 the letter b, and so on. It's a code because the numbers represent something else, like letters. You can also represent computer instructions in a code (called machine code) and then you can design chips that read that code and execute those instructions. A chip that does this is called a processor, and the instructions it runs is called a program. You can also represent letters, and this kind of code is called an encoding. ASCII and ANSI are some simple encodings that you can use for English, and UNICODE is an encoding you can use for any language. You can also write letter codes that convert to machine code. This kind of code is called an assembly language, and a computer program that converts assembly to a new program is called an assembler. You can also write more complicated codes that you can use to create programs. This kind of code is called a programming language, and there are thousands of different programming languages with different levels of complexity. If someone says they are a coder, they probably mean that they write computer programs in a programing language. & #x200B; The 0's and 1's in the machine, by themselves are totally meaningless, and it's the machines ability to read those numbers as machine code, process those numbers with computer programs, or to convert them to a different format with encodings that make them useful. The computer can also just read them as binary numbers if it needs to, but binary is still a 'code' of sorts (called a number system) that converts those high and low voltages into numbers." ]
[ 11 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
cdsa2s
What are the cores and threads on a processor and why does it seem like more = better?
I've been looking for a new processor to buy because my current one is pretty bad. I quickly found that apparently cores and threads are a thing. How do they work, why do they matter, and why would you want more or less of these in your CPU?
Technology
explainlikeimfive
[ "etw29wr" ]
[ "In bare bare basic terms a core is like an office and a the threads workers. More cores more space for workers. Some processors are able to have 2 workers per office (hyperthreading Intel and multithreading amd). More workers more productivity. Although it is not always the case. And the new ryzen 3600 for 200 us is a super good deal for budget gaming or work machine. 6 cores 12 threads." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
64jlnq
What causes liquid to run down the side of your cup instead of following the usual rules of gravity and falling straight down?
Physics
explainlikeimfive
[ "dg2lgo0" ]
[ "Surface tension. It's strong enough to keep liquid clinging to the smooth surface of the cup. It still follows the usual rules of gravity, and having a pour spout or a little notch near the side is enough to allow the liquid to build up enough that gravity will overcome the tension." ]
[ 8 ]
[ [] ]
[ "url" ]
[ "url" ]
69vkxx
How/Where do Windows computers search for driver software when you click "automatically search the internet"?
Technology
explainlikeimfive
[ "dh9t1hq", "dh9pkq7" ]
[ "The hardware devices in your computer all have a Hardware ID that Windows keeps track of. Each driver has four set of IDs (Vendor, Device, Driver Version, Revision - if I recall correctly). When Windows is asked to search the internet it checks with a repository Microsoft has. At its basic level, Windows requests a driver for a Hardware ID that is 'newer' than the driver it currently has. If there is one, it is downloaded and installed. If the driver can't be unloaded and replaced then you are prompted to reboot after the update to allow the driver in memory to unload and be replaced. Things can get a little more tricky with driver 'ranking' when there are multiple 'newer' drivers for a piece of hardware. In general Windows takes the driver that is the most trusted in those cases (based on who made it, if it has been 'certified' from Windows Hardware Quality Labs (or WHQL), etc...) The system works with the idea that in general, the \"newest\" driver is the best one, but it isn't always the case. EDIT: Changes words to make things clearer" ]
[ 8 ]
[ [], [] ]
[ "url" ]
[ "url" ]
9iivu9
why can the FDA ban vapes and flavors, but not cigarettes?
Other
explainlikeimfive
[ "e6jxbw0", "e6jzft2" ]
[ "They have banned cigarettes from kids below age 18, I believe they’re going for a similar sentiment with the vaping trend. They believe the flavors entice the youth too much." ]
[ 4 ]
[ [], [] ]
[ "url" ]
[ "url" ]
i40hvd
What makes internal bleeding different from the blood that regularly flows through the body and comes out when you get a paper cut or some form of surface scratch/injury?
Biology
explainlikeimfive
[ "g0f588e", "g0f5hxl", "g0f6ajx" ]
[ "Typically it just means that blood is escaping into a space that shouldn't be filled with blood. In large cavities such as your chest, pelvis or certain compartments in your leg, you can lose a LOT of blood; sometimes without knowing. In comparison, an external bleed is usually obvious and can be quickly treated. Treating an internal bleed is much harder since you may need to get inside past viral structures in difficult to reach spaces to stop it. They also tend to be more severe since a paper cut is only affecting the tiny blood vessels in the skin, whereas an internal bleed may involve a vessel that is a few centimetres in diameter. Source: med student, top of my head, feel free to correct me!" ]
[ 10 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
bmyjbf
Why do chainmail suits block out electricty from shocking you
Physics
explainlikeimfive
[ "en0q0bq" ]
[ "first of all its not true that electriciry goes the path of least resistance, it goes through all paths. the reason you dont get shocked is because you are in parallel with a very low resistance, which means that the voltage drop across you is very low assuming there are other larger resistors in the circuit (such as the source internal resistance or resistance from long wires). Ultimately its the voltage across you that will determine if you get shocked or not" ]
[ 5 ]
[ [] ]
[ "url" ]
[ "url" ]
789m81
George Soros
Other
explainlikeimfive
[ "dos3b3m", "dos86b6" ]
[ "He a billionaire who donates money to causes he supports, but because he’s liberal and Jewish, the right wing tap into the old tropes of anti-Semitism, especially the lies surrounding Jewish bankers/financiers." ]
[ 24 ]
[ [], [] ]
[ "url" ]
[ "url" ]
6mfd6w
The difference between a hotel, motel, inn, lodge, etc.
Other
explainlikeimfive
[ "dk15bko", "dk1ap6j", "dk15nqd" ]
[ "That is a tough one. There is a lot of overlap between the different lodging classes. The most distinct is the Hostel, which is shared rooms, almost like a barracks. Then you have your B & B, which is like renting a bedroom in someone's home, but usually still a professional setting. Lodges are usually going to be small cabins for rent in wilderness areas. Inns are any sort of combination food and lodging. In Europe, it's actually usually a bar that rents rooms, also called a \"guest house\". In America, it tends to be a building with interior corridors that serves breakfast or has a small diner on site. Motels are usually exterior corridor buildings. The name derives from \"motor hotel\". And hotels are the larger buildings, interior corridor, with restaurants and additional amenities, like meeting spaces, gym, and room service." ]
[ 30 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
idricd
What was feudalism?
And why did European society shift from the Roman setup (which at least had democratic representatives right?) to a monarchy?
Other
explainlikeimfive
[ "g2axy8k", "g2awyh4" ]
[ "Feudalism means a series of personal client-patron relationships, flowing down from the king. The main point of feudalism is a layer of sovereign-vassal relationships. There is a supreme sovereign at the top, with a few vassals, each of whom is also a sovereign to his vassals, and so on. Specifically, the king owns all the land in the kingdom. He then distributes the land to his major supporters - let's say his dukes. Each duke gets a giant section of the kingdom, and then splits it into further smaller chunks, distributing those to his... counts, let's say. Each count splits his lands and distributes them to barons. Each baron splits his land and distributes small chunks to his knights. The knight, as the base unit of nobility, works his land directly and/or using serfs - poor farmers who don't own any land (and are often effectively attached to the land as an asset, with no freedom of movement). Every knight owes taxes to his baron, who owes taxes to his count, who owes taxes to his duke, who owes taxes to the king. Money flows upwards to the king. Same with military service: a knight must show up for his baron's war party when called, barons must show up for the count's regiment, counts must show up for the duke's corps, the duke must show up for the king's army. In a purely feudal system, each level is loyal only to the level directly above it. So a knight must take orders from his baron, but *not directly from the count or duke*. The key phrase is: My vassal's vassal is not my vassal. Now, why did they shift away from the Roman model? Because Rome was super-centralized. All the feudal power flowed up to the city of Rome, and the citizens of Rome then internally had a kind of democracy. This democracy did not really apply to the people in the colonies, though. Once Rome fell and these lands became their own kingdoms, feudalism was the most effective means of a) establishing a power structure, b) reliably collecting taxes for the central authority (king), and c) maintaining the ability to gather a force of well-trained, well-equipped knights. Each small landowner was given land and serfs specifically to pay for his military equipment and combat training." ]
[ 14 ]
[ [], [] ]
[ "url" ]
[ "url" ]
a7d4kg
With so much YouTube drama, it seems there would be a huge market for an alternative site. Why isn't there one?
Technology
explainlikeimfive
[ "ec20fep", "ec20w9o", "ec218h8", "ec218aw", "ec20tn1", "ec20zjx", "ec23m3n", "ec20z00", "ec24edt", "ec241f9" ]
[ "Twitch is branching off with features that support content creators who are searching for a alternative but that's all as far as i know. YouTube is just such a conglomerate that it controls the whole market around it." ]
[ 173 ]
[ [], [], [], [], [], [], [ "https://en.wikipedia.org/wiki/Network_effect" ], [], [], [] ]
[ "url" ]
[ "url" ]
7348mq
What keeps shoppers of digital products from locating themselves in a state without sales tax to save money? How do companies know if they're lying?
Specifically, Nintendo's eshop asked me for my zip code to calculate sales tax. Luckily, I live in a state without sales tax, but what would keep someone who lives elsewhere from putting in the same zip code?
Other
explainlikeimfive
[ "dnngys2" ]
[ "The zip code typically has to match the one associated with your credit card, which has to be associated with your actual address if you want to be able to get the card." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
i9xzyf
Why do some appliances/devices require 6 AA batteries instead of 2 C batteries?
Or whatever the equivalent would be. I'm not a battery guy obviously.
Technology
explainlikeimfive
[ "g1i8uem" ]
[ "AA, AAA, C, and D batteries all have the same voltage (1.5 V) but have different amounts of total charge and different maximum current. If you use 6 AA batteries in series you can get 9 volts but with more charge than a single 9V battery. With 6 AA batteries in parallel you can likely provide more current than 2 C batteries without overheating the batteries." ]
[ 6 ]
[ [] ]
[ "url" ]
[ "url" ]
7vq86b
Why are three pin plugs better than two pin plugs in terms of safety, and why?
Technology
explainlikeimfive
[ "dtukunc" ]
[ "The ground (the third prong) is a failsafe that appliances and tools can use if they want to. If you have a power tool in your hand and something shorts out inside and electrifies the casing or something else touching you, you would get shocked. But if the tool was designed to use the ground, the casing would be attached to the ground, making the path of least resistance the ground wire and third prong, rather than into your hand. It's like a spillway on a dam or the holes along the rim of a sink or bathtub, there to take away extra water and dump it somewhere other than your floor, just as the ground dumps extra current back into the wall socket, rather than go somewhere current isn't supposed to, like your hand." ]
[ 7 ]
[ [] ]
[ "url" ]
[ "url" ]
a21y1r
What happens to cause a computer to crash?
If it’s just 1s and 0s how are certain things more complex for the computer to handle than others? Is it just the sheer volume that overwhelms the computer stuff inside?
Technology
explainlikeimfive
[ "eauhnry", "eaugzs6" ]
[ "First up, you have to understand that computers are built up on layers upon layers of technologies. I code on C# at work, I can use commands like 'send an email' and the technology I use knows how to do that. You have more low-level technologies below that, I can also call directly into the network and connect to an email server and talk to it in raw SMTP - the language that email servers talk to each other in. I could even talk directly to the network hardware in the computer and manipulate the electronic signals it pulses in to your phone line. It's how all those 1s and 0s end up creating beautiful 3d landscapes in games, no one is coding 1s and 0s, no one is clever enough to code in binary directly anymore (aside from some _very_ specialised areas) people code on layers which ripple down getting closer and closer to the computer hardware. So you have hundreds of technologies all working together to make your computer 'do its thing' made by hundreds of different companies / developers. Now, most computers are programmed in instructional languages. \"do step 1\" \"do step 2\" \"do step 3\". We wrap it up in all these fancy techniques but essentially its just a series of steps to make the machine do what you want it to do. Imagine I'm coding _you_. I tell you to walk forward 3 paces, open a door, walk through the door, turn right, turn on the light. Now imagine I've programmed another redditor to sneak in and lock your door. You run your code, walk forward to the door and the door won't open. Computers don't have imagination, they just follow the steps, so in that case the computer wouldn't know what to do, it would crash. There are hundreds of things that can go wrong like this, the door is locked, someone else is standing in the door, the provider of the door has changed how the handle works (windows update much?) or maybe in the hundreds of instructions I gave you I was drunk one night after working 14 hours straight and just told you to turn the wrong direction. All ways a computer can crash." ]
[ 17 ]
[ [], [] ]
[ "url" ]
[ "url" ]
8o56xv
Why are MRSA carriers not dead?
Biology
explainlikeimfive
[ "e00rtr0", "e016n4e", "e01cao8" ]
[ "There is a difference between colonization- like a carrier, and infection. I am a nurse, I likely am colonized with MRSA. But our body can be colonized by dangerous bacteria and keep it in check. Until our immune system is compromised, or our flora is out of balance, it might not overgrow into an infection." ]
[ 15 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
lj99yv
What differs in the decomposition process of a human body when it's in the water compared to when it's on ground in contact with air etc.
Biology
explainlikeimfive
[ "gnawsi9", "gnahhxb" ]
[ "If you want to learn more about it, there’s a fantastic book by Mary Roach called “Stiff; the Curious lives of Human Cadavers.” It explores many of the ways our bodies are disposed of when we’re done with them." ]
[ 6 ]
[ [], [] ]
[ "url" ]
[ "url" ]
90oxqp
Why are external medications harmful when ingested?
Biology
explainlikeimfive
[ "e2s0zsg" ]
[ "Basically it has to do with the absorption rates into the bloodstream. Absorbing through the skin is extremely inefficient so the concentration of active ingredients tends to be much higher, as such if you ingest it then the greater concentration can lead to an overdose. Additionally, depending on what it is, a topical application of the treatment is likely to be more direct to the underlying symptoms whereas an ingested treatment tends to propagate throughout the body." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
e1juv8
what’s the difference between a stroke and a brain haemorrhage?
Biology
explainlikeimfive
[ "f8ppe4i", "f8ppfx7" ]
[ "A stroke is caused by any event that reduces or stops blood flow to your brain. One type of stroke is a hemorrhagic stroke, which is caused by a brain hemorrhage. The other is an ischemic stroke, which is when blood vessels are either blocked or narrowed. A brain hemorrhage doesn't necessarily mean you're going to have a stroke, but it does increase the risk." ]
[ 6 ]
[ [], [] ]
[ "url" ]
[ "url" ]
5tavrt
How can a 737 land on a snow covered runway perfectly and I it's hard for me to drive on snow?
Engineering
explainlikeimfive
[ "ddlg4cf", "ddlfuj5" ]
[ "A 737 can only land on a 'snow-covered' runway if it's significantly longer than the published runway length for the aircraft at the landing weight. The jet will use full reverse thrust for nearly the entirety of the stop; they also have anti-lock brakes to prevent too much skidding, so whatever stopping power the brakes can add is used to the fullest. For the most part, a runway is kept as clear as possible with plowing + de-icer so the plane is really just landing on a wet runway. To the guy who says that 'no tire can be expected to provide traction,' jets have to be certified to stop entirely without reverse thrust (on a dry runway) and many airports restrict the use of reverse thrust for noise consideration. Reverse thrust will decrease stopping distance by 20% or so, it doesn't do the whole job." ]
[ 7 ]
[ [], [] ]
[ "url" ]
[ "url" ]
8j6dgi
Why does heat make me so angry
Other
explainlikeimfive
[ "dyx90dk" ]
[ "Right there with you. Lived in Albuquerque for many years and hated the heat. Now I live in northern Minnesota and love the coldness." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
633d82
The Dalai Lama and why China has a problem with him?
Wasn't sure if flair should be Culture or Other; went with culture.
Culture
explainlikeimfive
[ "dfqzqen", "dfqzogc" ]
[ "The Dalai Lama is the traditional head of the government of the region/country of Tibet. China declares itself to control and own Tibet as a part of China, although affording it regional autonomy. The Dalai Lama on the other hand refuses any official Chinese title and rejects China's control of the area, declaring Tibet as an independent country. China of course doesn't enjoy this sort of rebellion and generally sees the Dalai Lama as a criminal." ]
[ 12 ]
[ [], [] ]
[ "url" ]
[ "url" ]
c513ub
What's the different between Gen 3/3+ or Gen 4 nuclear reactor to the normal Gen 2 reactor? What are the advantages?
Engineering
explainlikeimfive
[ "erzdqnr", "erzed7t" ]
[ "3+ plants incorporate passive safety features. That’s the biggest difference. Gen 3 plants eliminate large Recirculation piping and reduce the size of the worst possible LOCA because of smaller piping. They are usually simpler. They take advantage of the operating knowledge of the gen 2 plants which are the first plants that had very high power densities. They use more digital or solid state integrated control systems instead of the gen 2 plant analog control systems. Gen 3 plants are more standardized" ]
[ 5 ]
[ [], [] ]
[ "url" ]
[ "url" ]
j5uptp
Why is it tempting/satisfying to pick at scabs?
Biology
explainlikeimfive
[ "g7uglai" ]
[ "At least for me, I hate feeling a bump that shouldnt be there, and it's a relief for it to be gone, if only temporarily." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
65gpya
Why do we get a chill when we bite metal like a fork or a spoon?
Biology
explainlikeimfive
[ "dga5d31", "dga5gub" ]
[ "I don't think that happens to everybody. Do you have metal dental fillings?" ]
[ 7 ]
[ [], [] ]
[ "url" ]
[ "url" ]
5wftga
Do ships still use constellations for orientation?
Other
explainlikeimfive
[ "de9qgkz", "de9qmyn" ]
[ "No, they use GPS. However celestial navigation is still taught to be used as a fallback, in case the more modern systems fail for any reason." ]
[ 19 ]
[ [], [] ]
[ "url" ]
[ "url" ]
lyzqvo
How far of the universe can we actually 'see'? And how did we discover the ones that we can't.
Physics
explainlikeimfive
[ "gpxezbv" ]
[ "We can only see one Universe, there's only one we're apart of. If you mean galaxies, then we can see more as time passes and technology grows. This is because as time goes on more light from things closer to the edge reach us, and as our tech grows we get more precise instruments. An example of the light traveling is even now if you look at the sun, everything you're seeing happened about 8 minutes ago. Even if the sun were to explode right now, you could read this before you would notice. It's sort of the same with when we say something is light years away. It takes light that long to reach us. So say a galaxy (or anything) just formed 10 light years away from us. We wouldn't know until 2031." ]
[ 6 ]
[ [] ]
[ "url" ]
[ "url" ]
5sm1az
The system for numbering interstate highways.
Other
explainlikeimfive
[ "ddg1i6e", "ddg79tc", "ddg1en6", "ddg1idr" ]
[ "Primary routes have two digits. Odd numbered highways run north and south, with lower numbers in the west and higher numbers in the east. Even numbered routes go east-west, with the lower numbers in the south and higher numbers in the north. Three digit routes starting with an even number are loops within or around a city. Three digit routes with an odd number are spurs into a city. For such three digit routes, the last two digits indicate the primary route they are based on." ]
[ 282 ]
[ [], [], [], [] ]
[ "url" ]
[ "url" ]
ahbtnf
Big Bang and the observable universe diameter
Physics
explainlikeimfive
[ "eed3aza" ]
[ "It expanded faster than the speed of light. Speed of light (or more correctly of causality) is the speed limit for things traveling through space. Space itself has no such limitation." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
b9jbfj
If you put your ear close to one of those foil balloons (birthday, etc., not the regular latex/rubber ones), the sound gets noticeably quieter. If you put your ear next to a wall at the same distance, the effect is not nearly the same. Why?
Physics
explainlikeimfive
[ "ek50s3n" ]
[ "I could be mistaken, but the way I understand it is, sound travels as a mechanical wave. In other word it is made of vibrations that are transferred as one particle pushes on the next and so on, forming a sort of domino affect. In a solid wall, the particles are closer together, allowing sound waves to travel from one particle to the next more easily. Alternatively, in a balloon, the matter inside is a gas, so the particles inside are farther apart which decreases the speed of the wave. I’m thinking there is probably more to it than just that, so hopefully a physicist will be able to add to this and/or explain it more thoroughly. Edit: Typo" ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
c13bu9
Why are there no guns with more effective explosives than gunpowder?
Engineering
explainlikeimfive
[ "eracxsm" ]
[ "I think you are seriously mistaken. Firearms haven't used gunpowder since [cordite]( URL_0 ) AKA smokeless powder was invented in the late 19th century. The only guns you'll find today that use actual black powder are antique and replica muzzle-loading rifles." ]
[ 5 ]
[ [ "https://en.wikipedia.org/wiki/Cordite" ] ]
[ "url" ]
[ "url" ]
bpqu7x
How do cameras at golfing events keep track of a golf ball after it's been hit when its moving so fast and so small?
Technology
explainlikeimfive
[ "enwitok", "enwtmyo", "enx0sp4", "enwnb3f" ]
[ "Typically they change the contrast in their viewfinder so the sky is white and the ball is black. That, and years of practice." ]
[ 85 ]
[ [], [], [], [] ]
[ "url" ]
[ "url" ]
e760n3
Why passenger trains in the US are often delayed while passenger trains in Europe and Asia have much better on-time performance.
I’m sitting here in 30th St Station in Philadelphia and almost all the Amtrak trains are delayed. How can train networks in other countries run so efficiently and we can’t seem to get our act together here.
Engineering
explainlikeimfive
[ "f9vl9hg", "f9vl9h4", "f9vng9v", "fa0nex0" ]
[ "Outside of the Northeast Corridor (Washington DC to Boston), there are almost no rails dedicated primarily to passenger rail. Freight companies own most of the country's rail networks, and they don't always give Amtrak trains the highest priority." ]
[ 9 ]
[ [], [], [], [] ]
[ "url" ]
[ "url" ]
hek5bl
How do scientists know the Big Bang happened?
What proof is there that the Big Bang happened? How do they formulate that theory with what is observable with the human eye?
Physics
explainlikeimfive
[ "fvrr6x0", "fvrrx1e", "fvryvpj", "fvrrfgw", "fvrrc49" ]
[ "We can literally see it. Or more specifically, a moment in time very shortly after it. Because light travels at a fixed speed, the further away you look, the further back in time you looking. Our sun is eight light-minutes away, so when you see it in the sky you are basically seeing an eight minute old video of it. Same thing with a star five light-years away being basically a five-year old video of that star. Look about 14.5 billion light years out in any direction, take into account the expansion of the universe and how it stretches light, and you can see an incredibly hot, dense explosion that was at one point everywhere in the universe. That explosion is made of one-visible light stretched into the microwave band, and it is essentially a baby picture of the universe." ]
[ 13 ]
[ [], [], [], [], [] ]
[ "url" ]
[ "url" ]
6punjq
Sharks, crocodiles etc. When they eat in the water their prey, where does all the water goes when they swallow? Do they somehow filter meat from water or do they just swallow it all?
Biology
explainlikeimfive
[ "dkskvho", "dksd6fw", "dksjqum", "dkseik7", "dksdxhl", "dksm6ng", "dksfyf9", "dksmtcp", "dksr7zg", "dkt7ihk", "dksgh6w", "dksqftv", "dksqkdp", "dkshnby", "dkx6qnz", "dkstvfz", "dksnurs" ]
[ "I feel like the question was \"Does it gulp a lot of water into it's stomach along with the food and does the water stay there or does it somehow get pushed out. And the reason this is an interesting question would be, does gulping large quantities of water mean that the shark is always ingesting way more water than food? And does that affect how it has to eat." ]
[ 4543 ]
[ [], [], [], [], [], [ "http://www.amnh.org/exhibitions/water-h2o-life/life-in-water/surviving-in-salt-water/" ], [], [], [ "http://animals.howstuffworks.com/reptiles/alligator3.htm" ], [ "https://www.google.com/search?q=crocodile+palatal+valve&client=ms-android-virgin-us&prmd=isvn&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiGr9GXpKrVAhUHOrwKHYIVA7QQ_AUICSgB&biw=360&bih=513#imgrc=Df0aqVKCtKzweM" ], [], [], [], [], [], [], [] ]
[ "url" ]
[ "url" ]
7hypwb
How does Whatsapp make money/profit?
Technology
explainlikeimfive
[ "dqusgzp" ]
[ "When a product is free, you are the product. Despite facebook telling us it's secure, I'm pretty sure they run a ton of analytics algorithms on your contact list, most used words, hours of sleep, ..." ]
[ 6 ]
[ [] ]
[ "url" ]
[ "url" ]
argy6m
Why do games render cutscenes real time instead of the cutscene just being a video that plays?
Technology
explainlikeimfive
[ "egn543t", "egn7hog", "egn53sa" ]
[ "More flexible and cheaper. In-game cutscenes mean you don't need external models and art, in addition to tooling; you can use your engine for everything. It's also easier to change something. If you want to change what happens, then you just do it; you don't have to re-render it. Also ages better, though I'm not sure anyone cares in the moment." ]
[ 11 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
9ejal8
Why do some candidates refuse to accept money from PACs/Super-PACs as if it's a bad thing - for example, what's the difference between me donating to a candidate directly or me donating to a PAC which donates to the candidate?
Culture
explainlikeimfive
[ "e5per8f" ]
[ "A PAC (or more specifically, a Super PAC) in some cases doesn't have to declare where the funds come from; that's the main issue, although there are some (small) steps being taken to change that. They can be used to funnel a great deal more money towards a nominee's interests than an individual could. They can only donate limited funds directly to a campaign, but they can run ads that benefit a particular candidate -- as long as they don't coordinate with the candidate directly. On top of that, you can only give a maximum of $2,700 to a given candidate, but you can give $5,000 to any number of PACs that support your interests. If you want to dole out $5,000 apiece to Yellow Team Sucks, Purple For A Brighter Tomorrow, MauvePAC and FuchsiaPAC, you can do that. That's $20,000 in campaign money that's going to support the purple candidate, which is a lot more bang for your buck than the $2,700 you'd be able to donate personally. Additionally, taking the support of a PAC might come with certain conditions attached to it. The idea of behind beholden to big-money interests is increasingly unpopular among certain sections of the electorate, specifically in the wake of things like the Citizens United ruling." ]
[ 8 ]
[ [] ]
[ "url" ]
[ "url" ]
5psn5f
Since Jupiter is 95% hydrogen, could its atmosphere be lit on fire?
In reference to the Hindenburg.
Physics
explainlikeimfive
[ "dcthi3e" ]
[ "You'd need an oxidizing agent (e.g. oxygen). The burning of hydrogen is just the reaction between hydrogen and oxygen. No oxygen, no combustion. Any oxygen that is in Jupiter likely already reacted with something like hydrogen a long, long time ago." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
edooe8
What are gamma values in pictures and why does it affect png (aka make it worse than jpeg?)
Technology
explainlikeimfive
[ "fbjj7gi", "fbjm152" ]
[ "This comes from the days when computers were much slower and monitors were huge and heavy boxes with thick glass on the front of the screen - the CRT, or cathode ray tube, uses intense electromagnets to shoot tiny bits of stuff at a screen that glows when hit by this stuff. That's how it makes colors and pictures, by changing how the stuff is fired at the screen and by aiming to make flat lines to cover the whole screen down from the top, 30 or 60 times every second. When this was going on, in the earlier days of computing, we hadn't figured out how to make colors exactly the same from Mac os and Windows and other computer operating systems. When we tried the normal way they looked different, and that did not work for us. So we tried to use this gamma value to preserve the color we would see on the screen from one device to another to make them match. But something went wrong when not everyone agreed on how or even if they wanted to use it at all. So all sorts of things happened, some devices used it right and others did not. It was a mess! The gamma value specifically tells the computer how much of the color to show, from none to all of it or possibly even more. That's because the gamma was used to say 'this device is already showing more green and red and blue than the one that made the image, so turn down the colors of this image so it looks right on this device' or 'this device naturally shows less green and red and blue than the one that made the image, so turn them all up to match'. Over time we realized how silly this was and fixed the problem in a better way so everything matched all the time outside of gamma images. Now the gamma value is a leftover of what was tried before, and most browsers don't use it or have a default set up to work in most cases. Better or worse depends on what you're doing. PNG is designed to be good on websites, so it can get smaller than a jpg or gif with the same picture. But not all browsers support it the same as jpg or gif formats, there are still old browsers out there still using the gamma values or trying to. Because of that it is a matter of knowing who will be using your site and images - if you need to use the old stuff jpg may be a better bet. If you have all new stuff png may work better. When you make new png files, the gamma can be left out to make it like a more efficient jpg format. Great question!" ]
[ 22 ]
[ [], [] ]
[ "url" ]
[ "url" ]
ckzazc
Why does a glass of milk go so well with sugary foods?
Chemistry
explainlikeimfive
[ "evrx2gg", "evrw3ac" ]
[ "The fat both coats your taste buds to prevent some of the sweetness from being overpowering, while also being rich tasting on its own to enhance the flavor." ]
[ 12 ]
[ [], [] ]
[ "url" ]
[ "url" ]
hvhjj9
about anesthesia
Biology
explainlikeimfive
[ "fytciec", "fyte5ju", "fytd8f7", "fytby8z" ]
[ "When I went under general anaesthetic a few years ago, one minute I was just laying there having a chat with the anaesthetist, and then the next minute, I'm waking up in a different room and babbling on to some guy about what type of vegetable an asparagus is. Think of it a bit like nodding off when watching the news and waking up to the Simpsons." ]
[ 7 ]
[ [], [], [], [] ]
[ "url" ]
[ "url" ]
h16vc8
Why is a building called a "building" when it is already built?
Engineering
explainlikeimfive
[ "ftqcghv" ]
[ "In English, we use gerunds, verbs ending in \"ing\", to create related nouns. You paint a painting, draw a drawing, and build a building. In this sense, \"ing\" can be seen as meaning \"that which is made by\", especially in an artistic sense, but there are more utilitarian examples, like a covering (a cover for an item) or a sighting (the event of seeing something)" ]
[ 17 ]
[ [] ]
[ "url" ]
[ "url" ]
9gv6pq
What is a benign developmental venous anomaly and what does this mean for me and my future?
Biology
explainlikeimfive
[ "e670nxg", "e671b5m" ]
[ "I can't give specifics, but I can dissect the word. Benign- harmless Developmental - happened in early childhood as a result of genetics or exposure at an early age Veinous - In the veins. Anomaly - unusual thingy. In other words, the MRI detected an odd thing involving the blood vessels in the brain that may be causing minor but mostly harmless effects that are probably why you went into an MRI in the first place." ]
[ 14 ]
[ [], [] ]
[ "url" ]
[ "url" ]
aiaw44
Cardinal Numbers.
Mathematics
explainlikeimfive
[ "eemelw5" ]
[ "The ordinary numbers you're used to do two things: They order AND they quantify. If you want to count the number of oranges you have, you'll go through them one at a time and maybe say something like * \"1 Orange, 2 Oranges, 3 Oranges. I have 3 Oranges\" But not only have you quantified how many oranges you have, you've put them in an order based on how you count them. You have the first orange you counted, the second orange you counted, and the third orange you counted. So the number \"3\" quantifies the number of oranges you have, but the process of counting them orders them as well. In everyday life, there is little need to distinguish these two things. In fact, for ever ordinary ol' number, there is exactly one quantity corresponding to it and exactly one \"order structure\" for them. Sure, you can rearrange the order, but the order will always \"look the same\", there's no way for it not to come in the order First, Second, Third. So, this is what numbers do. They quantify things, and they order things. Now, you *can* count without ordering (this is what the [Chinese Remainder Theorem]( URL_1 ) was originally used for), but most of the time we think of counting through this ordering procedure. But, when you get to larger amounts of things, infinite amounts of things, the distinction between the ordering process and the quantifying process becomes very important. If you have all of the positive integers in a box {1,2,3,4,5,...}, then you can arrange them in many distinct orders: * 1, 2, 3, 4, 5, 6, ... * 2, 3, 4, 5, 6, 7, ...., 1 In this last one, we have put 1 after every single other number. This way of ordering the numbers is totally different from the first way of ordering them. So even though both of these lists of numbers have the same *quantity* of numbers, we an find structurally different ways to order them. This suggests that when we push into investigating infinitely large things that we need to split the two functions of numbers, quantifying and ordering, and realize each of these as a separate *type* of number. The numbers that describe the *quantity* of a collection of things is called a Cardinal Number. The numbers that describe the *order* of a collection of things is called an Ordinal Number. So the two infinite lists of numbers correspond to the same Cardinal Number, which we call \"Countable Infinity\" usually denoted ℵ*_0_* or \"Aleph Null\", but correspond to different Ordinal Numbers, in this case it would be 𝜔 (omega) and 𝜔+1. There are larger Cardinal Numbers than ℵ*_0_*, the real line has *more* points on it than the quantity ℵ*_0_* can count and the cardinal number that counts this is called the \"Continuum\", usually denoted **c**. We can then write ℵ*_0_* < **c**. But, there are tons, and tons, and tons of Ordinal Numbers that work with the quantity ℵ*_0_*, it takes a long time to get to something of the size **c** using nothing but Ordinal Numbers. [VSauce actually has a really nice video on the topic that is pretty accessible]( URL_0 ). TL;DR: Cardinal numbers are quantities." ]
[ 3 ]
[ [ "https://www.youtube.com/watch?v=SrU9YDoXE88", "https://en.wikipedia.org/wiki/Chinese_remainder_theorem" ] ]
[ "url" ]
[ "url" ]
g42xma
How does cutting our toenails straight instead of a curve prevent ingrown toenails?
Does the nail grow sideways and into the flesh only when it is curved? How does cutting it straight prevent this?
Biology
explainlikeimfive
[ "fnv4x4k" ]
[ "Cutting straight allows the corners of the nail to grow past the edge of the toe where it would normally get ingrown, it'll just grow past the toe skin thingy and not be able to catch the skin." ]
[ 11 ]
[ [] ]
[ "url" ]
[ "url" ]
9ov1x2
What is the difference between sink water in the kitchen and sink water from the bathroom?
Other
explainlikeimfive
[ "e7wze83" ]
[ "There is no difference between the water that comes out of any faucets or spigots in your house or yard. It’s all coming from the same place." ]
[ 8 ]
[ [] ]
[ "url" ]
[ "url" ]
ldfmga
- What is "the chicken enchilada standard"?
Stouffers Chicken Enchiladas Family Size has a label on the front - 2 times the chicken\* \*Required by the chicken enchilada standard.
Other
explainlikeimfive
[ "gm5lxeu" ]
[ "USDA standard says that in order for an enchilada to be called that, it has to be at least 15% of the total weight in meat, cheese or poultry." ]
[ 9 ]
[ [] ]
[ "url" ]
[ "url" ]
j8m68f
Why does a car going in reverse make that distinguished sound?
Other
explainlikeimfive
[ "g8c3bbh", "g8bwb5c" ]
[ "Your forward gears have helical-cut teeth because that makes them quieter, but they're more expensive to make than straight-cut gears, and since you don't use reverse for long periods of time it doesn't matter if it's louder." ]
[ 29 ]
[ [], [] ]
[ "url" ]
[ "url" ]
e0z0b4
Why are buses so shaky and unstable?
Engineering
explainlikeimfive
[ "f8k4bj0" ]
[ "They are shaky, but they are very stable, in part due to the shakiness it is extremely difficult to tip over a bus due to the low centre of gravity and the long wheelbase, the shaking comes from the generally poor suspension which prevents the bus from \"bouncing over\"." ]
[ 11 ]
[ [] ]
[ "url" ]
[ "url" ]
es3l01
why doesnt a lighter work after being left outside in the cold?
Engineering
explainlikeimfive
[ "ff7mxnj", "ff7koqs", "ff7kijg", "ff7pucp", "ff7o5c9", "ff7q9i4" ]
[ "The boiling point of butane is about 30F / -1C. If it is colder than that, the butane liquid in the lighter will not turn into a gas and come out the top to burn (liquid butane doesn't burn). The trick is to hold it in your warm hands (or keep it in your pocket) to keep it well above the boiling point." ]
[ 8 ]
[ [], [], [], [], [], [] ]
[ "url" ]
[ "url" ]
hbi45r
How can hospitals put us in medically induced comas and remove us at any time, but can't remove people from a coma that isn't medically induced?
Biology
explainlikeimfive
[ "fv8wsl9", "fv8xehf", "fv8xjny" ]
[ "I am not a doctor, but it's my understanding that doctors give the patient drugs to.cause the coma, so they just withdraw the drugs to end it. When some is in a regular, non-induced coma, they can't end it because there are no drugs to stop giving." ]
[ 6 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
e1pyf9
how do we sense our distance from things when playing sports
i was playing badminton for the first time the other day and it made me wonder how i'm able to locate the approximate distance the birdie is from my racquet and be able to hit it without really looking at it. of course, we still need to look up at the birdie while it's in the air to adjust our body to an optimal position but we don't really look at the racquet when we actually hit it. i'm aware this isn't a fail-proof system but for the majority of the time, we're able to do it successfully.
Biology
explainlikeimfive
[ "f8r4ely" ]
[ "The human brain/body is a very powerful. I'll break down the question into a few parts. Human perception of distance is based on a bunch of different scenarios, but the easiest to explain is two eyes looking at a single object to determine distance. Think of a triangle with two points being each eye and the third being the object to determine the distance. This is the basic strategy in triangulation used in many technologies today. Essentially, the difference in images between two eyes calculates the perceived distance to the object (in the most simplest terms). This is all done constantly and without thought. Next we will take a moving object where this same strategy applies and calculate the distance the racquet head is versus the moving birdie. The birdie moves in a path that is relatively consistent so the brain can assume where the birdie will be instead of just where it is. This is how people catch baseballs etc. Your brain can also calculate where the racquet head will be and match that up with where the birdie will be. The accuracy of this is based on the individual and takes practice." ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
5ubvuy
Why are we so amazed at what past civilizations created (pyramids, temples, etc) how did we lose the way these types of mega structures were created?
I can't figure out how word it better hopefully someone understands what I'm asking. Thank you !
Engineering
explainlikeimfive
[ "ddsvy07", "ddsvxds", "ddt4wkl", "ddt3z3v", "ddt6rdb", "ddt3lhf", "ddsxsdi", "ddtx7vw" ]
[ "We are amazed because building massive structures without sophisticated machines and tools seems amazing to us today. We haven't \"lost\" anything though. People kept right on building amazing structures right the way through history. The pyramids, the Acropolis, the Aqueducts, hundreds of amazing Cathedrals, etc." ]
[ 196 ]
[ [], [], [], [], [], [], [], [] ]
[ "url" ]
[ "url" ]
5r0l7x
What are those sudden, weird, sharp pains that you sometimes get, usually in your chest, out of nowhere?
Biology
explainlikeimfive
[ "dd3ho9i" ]
[ "if they quickly come and go and feel like someone is squeezing your heart then it is not harmful. They are called precordial catch syndrome and they are not harmful as far as we know. they tend to dissipate with age. We currently do not know the cause of them." ]
[ 7 ]
[ [] ]
[ "url" ]
[ "url" ]
7wfkk5
Why does heartburn at night cause nightmares and a racing heart?
Biology
explainlikeimfive
[ "dtzxf36" ]
[ "I'm no Dr but I am a chronic sufferer of acid reflux, especially at night. I have never experienced this. It may be psychosomatic. I used to experience muscle spasms and stinging feelings in my back as a child and they were always accompanied by dreams of bee stings. I've experienced these feelings while awake and always assumed the dreams were my brain \"making sense\" of the information it was receiving. The brain likes to fill in blanks, even if it's wrong." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
6idock
How do "game rooms" and other illegal casinos get away with it for so long in places where gambling is illegal i.e. Texas
Other
explainlikeimfive
[ "dj5gjcc" ]
[ "It probably varies based on the location, but in Texas some of them are basically skirting the rules. They have a membership to go in and play, and don't take a cut, so it effectively becomes just people getting a place to gamble against other people, which is legal. In other cases, the casino is on a reservation. That's technically considered tribal lands, and isn't subject to state regulations." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
ach50m
Why are some perfume considered feminine and other masculine?
Other
explainlikeimfive
[ "ed7v28g" ]
[ "Women and men are associated with different scents due to older society role model stuff, and influenced by scents that match our sexuality. Guys would do \"manly\" stuff in their day-to-day, like work in the woods where their clothes would pick up evergreen scents, or work with horses and pick up the scent of leather, or bring home the clean scent of the open salt sea on their clothes from their naval adventures. So many gents' colognes accentuate those types of smells because women find them to be pleasant. Womens' perfumes are often more flower-like, possibly because women were more likely to use flowers as an expression of their femininity. Other notes like cinnamon or citrus are sort of in the middle and can go into either guy or girl scents, to add complexity and structure to it. And there are male and female versions of \"musks\", very complex scents that are associated with sexuality." ]
[ 10 ]
[ [] ]
[ "url" ]
[ "url" ]
8y3rt2
How do female astronauts deal with their period in space?
I just watched [this]( URL_0 ) video of a female astronaut showing around the ISS, including showing the bathroom and how it works. I noticed that she didn't explain what happens if/when she or another female astronaut gets their period in space.
Biology
explainlikeimfive
[ "e27w0vu", "e281bfx", "e287xuv", "e27wuby" ]
[ "It's likely that they'd choose to avoid having their period altogether for the obvious convenience. There's options with birth control to prevent you from getting their period for a certain amount of time depending on which one you get. I'd probably do that if I was in their position. But if they did choose to get their period naturally I don't see why tampons wouldn't work the same. Even pads should work the same as anything else. The blood doesn't like float around or anything. It sticks to the pad or tampon and you just wipe up the rest the same as if you went pee but just a little more thorough" ]
[ 24 ]
[ [], [], [ "https://webcache.googleusercontent.com/search?q=cache:tNUXfBVutUIJ:https://www.popsci.com/brief-history-menstruating-in-space+&amp;cd=10&amp;hl=en&amp;ct=clnk&amp;gl=au" ], [] ]
[ "url" ]
[ "url" ]
66llhm
Why does the ship suck you in when it sinks?
So I just recently started rewatching mythbusters and during one episode they examine the "suction" of a ship when it sinks, what got me really confused is the result. Now I used to work for a few years on cruise ships and I do have the basic training of survival on sea and am qualified to "save" passengers and the way I was taught is that you absolutely have to swim away from a sinking ship or it will drag you down. Mythbusters apparently proved it otherwise. Now I don't understand hydrodynamics one bit and heres my question: Why does a ship sink you in? Why did the mythbusters say otherwise? How does the whole water pressure work and buoyancy (escaping air from air pockets, water fill in the space etc)
Other
explainlikeimfive
[ "dgjkoq2", "dgjgzuw" ]
[ "Bubbles of air escaping from the sinking ship can reduce the density of water and thus reduce buoyancy for any nearby boats or swimmers. Boats are generally overly buoyant, but for swimmers the bubbles may be an issue. And the sinking ship could create eddy vortices that may drag swimmers down; depends on the shape of the ship and how fast it's sinking." ]
[ 5 ]
[ [], [] ]
[ "url" ]
[ "url" ]
c4jzfl
- Why does skin repair on your face when you get a scab, but not when you get acne?
Biology
explainlikeimfive
[ "erx92y2" ]
[ "Oh, it’s *trying* to heal. But acne isn’t one owie a year, it scabs over and it’s done... acne is an ongoing process where every goddamn time an individual wound starts healing, something else causes yet another wound (often in the same place). Some pores do make it to the scab stage and return to normal eventually— but others are stuck in a permanent cycle of partial healing and yet more destruction." ]
[ 5 ]
[ [] ]
[ "url" ]
[ "url" ]
7behyz
how do “smart” products save on electricity bills if they are always on?
As above. Smart lighting is supposed to save on energy costs but if they are always on and waiting for a signal, surely they are expending more energy than if it was a normal bulb turned on and off at the socket? The same question applies to smart plugs.
Technology
explainlikeimfive
[ "dphblli", "dphbdc3" ]
[ "The amount that these devices consume for the purposes of waiting for a signal is very small. The idea is that the amount of energy saved by the primary utility of the device (the light bulb, or the device plugged into the smart plug) being on less because the smart circuitry turns it on and off as needed far exceeds the amount of energy that is consumed when the device is not operating but is communicating with the controller. In other words, you might spend an extra two cents in \"smart controller\" power to save 30 cents on power consumption." ]
[ 9 ]
[ [], [] ]
[ "url" ]
[ "url" ]
6ko3kx
What causes babies to go from happy as can be one minute, to bawling their eyes out the next for seemingly no reason?
Biology
explainlikeimfive
[ "djnia35", "djnncrx", "djniha0", "djnr4md", "djnnfwc", "djnrdrp", "djnq0ad", "djns38u" ]
[ "Babies can't communicate except by crying and everything is new and weird. Cold breeze? Cry. Feeling lonely? Cry. Just realized you're hungry? Cry. Tummy hurts? Cry." ]
[ 405 ]
[ [], [], [], [], [], [], [], [] ]
[ "url" ]
[ "url" ]
618hmz
What is M-103 and Sharia Law all about? How are they connected and why are so many people against it?
Culture
explainlikeimfive
[ "dfchtrc", "dfcklmx" ]
[ "M103 basically condemns islamaphobia, however no clear definition of islamaphobia is given thus you could say something like \"I don't think Allah exists\" and it would be considered islamaphobia. The fact that it's for Islam alone and it is essentially an assault of free speech means it's not that popular. Sharia law is basically a governing moral system in Muslim majority countries derived from Islam. It states stuff like husbands can beat their wives and generally really oppressive things about women." ]
[ 25 ]
[ [], [ "http://atheism.wikia.com/wiki/Problems_with_Muslim_Sharia_Law", "http://www.americanthinker.com/articles/2005/08/top_ten_reasons_why_sharia_is.html", "https://counterjihad.com/women" ] ]
[ "url" ]
[ "url" ]
bwoog2
Why do so many otherwise great TV shows struggle to end their stories well? What is it about the creative/production process that makes this so difficult?
Specifically talking about shows versus movies, and shows that are widely considered to be good throughout many seasons.
Culture
explainlikeimfive
[ "epyzrha", "epz0h2q" ]
[ "Simply put, it's easier to tell a 2 hour story than what amounts to an 80 hour story. With a 2 hour movie you spent 20 minutes introducing your characters, build your story a little and then spend 20 minutes ending it. If you've got 65 hours story building, it would feel very cheap to spend 20 minutes on ending it. In modern times the internet also plays a factor here. With fan communities theorizing your possible endings, a lot of writers feel an obligation to avoid ending things the way fans expect, so if the obvious ending is the best ending, it may not get used." ]
[ 13 ]
[ [], [] ]
[ "url" ]
[ "url" ]
bn4x3d
how does supply driven economics work?
Normally we talk about demand driven economics where producers make products to satisfy the demands of consumers. One of my professors mentioned supply driven economics. How does this one work and how well does it approximate real life?
Economics
explainlikeimfive
[ "en2f7be" ]
[ "I've interpreted the question primarily in the context of macroeconomics. No non-hack economists have used terms like supply-side economics and demand-side economics since the 1980s. Anyone who has got past undergraduate economics and expressed any interest in graduate school will have got to both aggregate demand and supply. In 2019, these terms are political ones that have basically no relation to the actual practice of economics. Returning to the question. Generally, what is considered to be supply-side economics, isn't actually supply-side economics. The main explanation for this concept goes something along the lines of \"if we reduce taxes, people can spend more and buy more things\". This is fundamentally a demand-side story. What the terms originally meant in the 1980s was a broad label between \"Old\" Keynesian (then not old) demand-management economics and a more broad non-novel belief that lower taxes and looser regulations would lower costs on firms and allow them to expand production. This is not an unreasonable idea. If it is expensive and difficult for firms to expand, they will do less of that. Making it easier and cheaper for them to do so has the same incentive effect as making Netflix cheaper will have on Netflix subscriptions. If it is expensive for firms to raise equity, they will do less of that, lowering their ability to invest in machines and other products. In the late 1970s, there was also something now called \"stagflation\", which was a generally stagnant economy accompanied with high inflation. In such an environment, increasing demand would likely cause higher inflation rather than any economic growth. And in that environment, such policies are eminently growth-increasing, and in the added context of higher interest rates intended to avert inflation, one of the few mechanisms by which government can avert recessionary tendencies. Politically, this idea has been massively overblown, even in the 1980s. You can find a general and relatively contemporaneous overview of the politicisation and general unreality of \"supply-side economics\" in the public imagination sold to them written by Martin Feldstein, _Supply Side Economics: Old Truths and New Claims_, 76 American Economic Review, 26 (1986). What Feldstein calls the \"new supply-siders\" massively overpromised and, in his opinion, discredited many of the more reasonable economists who made legitimate arguments with modest and reasonable predictions." ]
[ 5 ]
[ [] ]
[ "url" ]
[ "url" ]
6ryzbp
How do bookmakers determine odds for unpredictable but likely events?
I was browsing a betting website and they were providing quotes for unpredictable events. Some were "jokes" (like area 51 being opened to the public) and had very high odds, like 500. Others were much more realistic, like a celebrity getting a divorce. And were like 1.1 for divorce and 1.3 for no divorce. How do they determine a reasonable odd, so that they don't risk losing too much money?? I mean... They have zero ways to estimate actual probability ratios!
Economics
explainlikeimfive
[ "dl8tco2", "dl8uf03", "dl93mof" ]
[ "> They have zero ways to estimate actual probability ratios! Of course they have, welcome to the real of statistics. There is a countable number of married celebrities, and a countable number of celebreties that get a divorce, and this gives a measurable marriage to divorce ratio over a given time, let's say a year. So we have 500 celebreties that are married in 2015, and of those 500 couples at the beginning of that year, 30 got a divorce (all numbers are completely fictional). So the probability for any given couple to get divorced is 6% every year. And now we take data over multiple years, and find that it's 5%, 6%, 11%, 3%, 4%, 6%, 5%, 5%, 7%, 0%, 4% from 2000 to 2011, giving us an avarage of about 5% in total. And now we introduce other criteria and look if they play a part in this... let's say actors married to musicians, are they having different values form actors with actors? And if you only have enough of those criteria, monitored over a long enough time, then you will eventually reach some kind of probability value, and based on that you can make odds that will always be in your favour same way as you would in roulette, once you know the probability of all the options, making odds for people to bet on is easy." ]
[ 4 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
kt5w5d
Why does it hurt when you put on deodorant after shaving?
Biology
explainlikeimfive
[ "gijzcfn" ]
[ "Same thing with after shave there are micro cuts then when something gets in the cut it stings" ]
[ 8 ]
[ [] ]
[ "url" ]
[ "url" ]
e5xwvj
How has the UK national debt increased when the deficit has decreased?
Economics
explainlikeimfive
[ "f9mhk7u" ]
[ "The Deficit is the gap between income and expenditure whilst debt is what we currently owe. Bonds also have the interest to be paid so this keeps the debt pile increasing faster than what the deficit would imply" ]
[ 6 ]
[ [] ]
[ "url" ]
[ "url" ]
75py20
Why when pulling an all-nighter do we go through a period where we're extremely tired and if we push through it wide awake?
Biology
explainlikeimfive
[ "do821rw" ]
[ "Your body has this thing called a circadian rhythm that tells you when you should do things like sleep. You get sleepy in part because you're tired, but in part because that's when your body is programmed to sleep. Once you pass that time up, you're still physically/emotionally/mentally tired, but you are no longer being pushed to sleep because \"it's time to.\"" ]
[ 14 ]
[ [] ]
[ "url" ]
[ "url" ]
gu0ko0
Why are games sold in disks? Wouldn't usb drives be more efficient and save space on the console?
Technology
explainlikeimfive
[ "fsfeh40", "fsfechs", "fsfirkd", "fsfnpb5", "fsg25jh" ]
[ "USB drives are much more expensive. They don't seem like they're that expensive, maybe $10 or so for one with the same storage as a blu-ray. But when you're mass manufacturing, a single blu-ray disc costs pennies to produce. Shipping on USB drives would either increase the price of games or make less profit for the publishers. Also, as we go into the next generation of consoles, USB drives won't be fast enough. The SSDs that are going to be in next gen consoles wipe the floor with the speeds of a USB drive, so you'd have to install them to the SSD anyway." ]
[ 158 ]
[ [], [], [], [], [] ]
[ "url" ]
[ "url" ]
e7o60k
how can phone screens tell the difference between your fingerprint and something like a stick?
Engineering
explainlikeimfive
[ "fa1tzfg" ]
[ "In a word, capacitance. The human body is a significant amount water, and that water has a specific range that is measurable by the phone. The phone puts a very small electrical charge on the screen and when it's disrupted by your finger, the phone \"knows\" that it fits the capacitance range, and assumes it's an input." ]
[ 12 ]
[ [] ]
[ "url" ]
[ "url" ]
j2cny6
why are wine glasses shaped the way they are instead of a normal glass cup?
Does it make it taste better or something?
Chemistry
explainlikeimfive
[ "g74ns6z" ]
[ "One reason why wine glasses are narrower at the top than the bottom is to concentrate the aroma (smell) of the wine as this is a major component in the experience of wine tasting. The wide bottom of the glass also helps increase oxygen exposure of the wine by increasing surface area. Oxygenating wine can help develop flavors and may help get rid off off flavors that can develop from the wine making process There are also different glasses for different types of wine. As a general rule I use stemmed glasses for white wines and stemless for reds. This is because white wines are typically served chilled so having a stem keeps your hands off of the glass thus preventing the heat from your hand from warming the wine. Red wines on the other hand are typically served at room temperature so keeping them cold is not an issue." ]
[ 10 ]
[ [] ]
[ "url" ]
[ "url" ]
65r2jv
Why dont police officers have to wear body cameras yet?
Other
explainlikeimfive
[ "dgciwrl", "dgckm6l", "dgcpuvu", "dgchwi1", "dgchq50", "dgcql5u" ]
[ "Police unions. No one has mentioned this yet. As most police officers are unionized, any change to their working conditions has to be approved through collective bargaining (negotiating with the union). Union contracts often run for 3-5 years so the state can't just tell cops to start using them. Since many police union members (cops) don't want the cameras the unions can delay or prevent departments from adopting them. Police unions are often politically powerful and politicians generally don't like to ram things down their throats that they really don't want. This is why in many places they've either been slow to adopt cameras or haven't done it at all. Note: I'm not demonizing police unions. They are not the sole reason that cameras are not fully adopted. Money is probably the number one reason, but there are also privacy concerns as well." ]
[ 32 ]
[ [], [], [], [], [], [ "https://en.wikipedia.org/wiki/CSI_effect" ] ]
[ "url" ]
[ "url" ]
aqpy38
Why is warm/hot water less thirst quenching than cool/cold water?
Biology
explainlikeimfive
[ "eghrv2w" ]
[ "We don't actually have a solid answer on that. Only some theories, often revolving around sensation feedback since water takes longer to reach the blood stream than other substances, so the body needs a way to tell you ease off before you over hydrate. It could also have to do with the secondary aspect of maintaining temperature homeostasis. It also might be that you taste it less, since cold can numb out your taste buds so it's \"Refreshing\" to cleanse your pallet, where as warmer water will allow you to taste any minerals or other substances in the water." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
aog067
What is the difference between mass and weight?
Physics
explainlikeimfive
[ "eg0ia5d" ]
[ "Weight is based on gravity. So its how strong the rock you'reon pulls you down. So your weight would change based on if you were on the moon or earth. Mass is how much matter or stuff makes an object. So its usually measured by putting an object in other matter and using the difference to find mass. So if you have a graduated cylinder you can fill it to water and drop a dice or penny or anything in it. And watching the water go up." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
920yqr
how do circuits vary voltage with no moving parts?
I understand a transistor works by having a gate that open the circuit flow once the voltage can overcome the potential barrier in the transistor effectively creating a non mechanical switch that can open and only extremely fast based on the voltage changes, but how exactly do they vary the voltage for this gate without moving parts in like a phone or sumn
Physics
explainlikeimfive
[ "e328zuz", "e328trn" ]
[ "There are a lot of ways so it depends on the device. Sometimes you use a moving parts like a button that the user pressed. If there is some kind of analog signal, such as an audio signal, the voltage and current will be constantly changing, since that is what a signal is. Almost any sort of input will have fluctuations in voltage. The antenna on a phone or radio converts radio waves to a changing voltage. Devices that use AC current have built in voltage changes. You'll also see a lot of DC devices that use some type of clock or pulse generator (the 555 timer is a very common one) to create a regular repeating signal." ]
[ 3 ]
[ [], [ "https://www.youtube.com/watch?v=tz62t-q_KEc" ] ]
[ "url" ]
[ "url" ]
afkkgr
How does muscle memory work?
Biology
explainlikeimfive
[ "edzc7mf" ]
[ "Scientists still figuring this out but here is general idea. When you learn something you brain use so much energy running over pathways in cell. Like ants randomly seeking food. Then the ants found shortest path to food and leave pheromones for other ants then ants line is formed they will use this line for food until condition change. Brain use this technique for efficiency." ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
ajv2c3
Can you melt wood without it combusting? If so, what is the end result?
Physics
explainlikeimfive
[ "eez084h" ]
[ "No, the wood will undergo pyrolysis if you prevent it from catching fire. This is how charcoal is made. Ultimately you can't melt wood, because the bonds that make up the 'mix of stuff' that is wood will break down at a lower temperature than the melting point of same. So it stops being wood before it can melt. If you keep applying more and more heat, the end products will either break down further, or melt, and eventually evaporate, but you no longer have wood well before that point." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
7g2h0f
Why aren’t we frantically planting seagrass everywhere since it stores more CO2 than an equivalent area of rainforest? Seems easier than haggling with locals to replant rainforest.
Biology
explainlikeimfive
[ "dqg3dlb" ]
[ "Biodiversity. There's alot of that in a rainforest, the cure for cancer could be in some tree beetle we've never discovered, but then went extinct when we cut down all the trees it lived in. Also a rainforest is much more resilient. One disease or pest can wipe out a whole system of seagrass, since they're all the same kind of plants. It's happened before, see: Irish Potato famine. It's happening now, see: Panama Disease. A rainforest can lose a species of tree to a pest, but there are 200+ other species left. By cutting it down, we kill all of the 200+ species." ]
[ 7 ]
[ [] ]
[ "url" ]
[ "url" ]
jqou8u
Why does cancer kill you?
I know what a tumor is, but can someone explain what terminal cancer is and what is it about cancer that can kill/ cause permanent damage to your body?
Biology
explainlikeimfive
[ "gboh7rd", "gbogqqr", "gbohdwm", "gbogrkn" ]
[ "It depends on the exact type of cancer. For some of them the cancer simply takes more nutrients than your body can supply and it causes the other parts of your body to die off. For some kinds of cancers as the tumor grows it will apply pressure and restrictions to various other parts of the body (such as the mother of a person I once knew whose tumor grew so large it sealed her esophagus causing her to choke to death, or a brain tumor which applies pressure on the parts of the brain which control vital functions.) Some cancers remain functional in their original purpose and cause overproduction of the function for their purpose, whereas others contain other mutations that can cause them to produce toxins. Lastly sometimes the immune system, in desparation to remove the cancers, may cease to recognize the difference between self and foreign bodies and may begin attacking the vital organs." ]
[ 35 ]
[ [], [], [], [] ]
[ "url" ]
[ "url" ]
68x4m1
At what point does the atmosphere turn into space and become a vacuum?
Physics
explainlikeimfive
[ "dh217a5" ]
[ "It's a gradual process, the Earth's atmosphere getting less and less dense with height. For each 17 km (11 miles) of height gained, the atmosphere becomes 1/10th as dense. The 'official' boundary of space, for records and legal uses, is 100 km up. This is approximately the height at which an aircraft could not create enough lift to fly using wings unless it flies so fast it's in orbit and doesn't need wings to stay up. But at 100 km there is still enough atmosphere that an orbiting object would be slowed down by drag and come back down to Earth within a few hours. Somewhat higher, about 350 km and above, the drag is low enough that satellites can orbit for months or years. The International Space Station periodically gets a boost from a rocket engine to compensate for drag slowly lowering its orbit. The outer limits of the Earth's atmosphere blend into the solar wind in interplanetary space, as the Sun's gravity and the speed of that solar wind become more important than the pull of the Earth at its distance. That's about halfway to the Moon, 200,000 km from Earth. Interplanetary space is far less dense than any vacuum we can make on Earth, but there is still stuff there. Nowhere is truly a perfect vacuum." ]
[ 6 ]
[ [] ]
[ "url" ]
[ "url" ]
7d2s8o
What causes the feeling of Déjà-Vu?
Repost
explainlikeimfive
[ "dpupg08", "dpuppi3" ]
[ "Sometimes something *really has* happened before. Like this question! :-) 1. [ELI5: What happens when we experience déjà vu? ]( URL_6 ) 1. [ELI5: Why do I sometimes experience Déjà Vu? ]( URL_4 ) 1. [ELI5: What is deja vu and how does it work? ]( URL_5 ) 1. [ELI5: Why do we sometimes feel Déjà Vu's ]( URL_2 ) 1. [ELI5: How exactly does Deja Vu happen, and is it abnormal to experience it daily? ]( URL_7 ) 1. [ELI5:Why do We Have Deja-Vu In Different amounts of Severeness? ]( URL_8 ) 1. [ELI5: Déjà vu ]( URL_3 ) 1. [ELI5: Why do people have Deja vu for things that clearly never happened? In other words, what happens in your brain when you experience deja vu? ]( URL_1 ) 1. [ELI5: Deja Vu. Why does it happen and How? ]( URL_0 )" ]
[ 6 ]
[ [ "https://www.reddit.com/r/explainlikeimfive/comments/1tljgo/eli5_deja_vu_why_does_it_happen_and_how/", "https://www.reddit.com/r/explainlikeimfive/comments/2zyk7o/eli5_why_do_people_have_deja_vu_for_things_that/", "https://www.reddit.com/r/explainlikeimfive/comments/3gupq1/eli5_why_do_we_sometimes_feel_d%C3%A9j%C3%A0_vus/", "https://www.reddit.com/r/explainlikeimfive/comments/1jnspm/eli5_d%C3%A9j%C3%A0_vu/", "https://www.reddit.com/r/explainlikeimfive/comments/1mwes3/eli5_why_do_i_sometimes_experience_d%C3%A9j%C3%A0_vu/", "https://www.reddit.com/r/explainlikeimfive/comments/12saub/eli5_what_is_deja_vu_and_how_does_it_work/", "https://www.reddit.com/r/explainlikeimfive/comments/512esi/eli5_what_happens_when_we_experience_d%C3%A9j%C3%A0_vu/", "https://www.reddit.com/r/explainlikeimfive/comments/2ts9ge/eli5_how_exactly_does_deja_vu_happen_and_is_it/", "https://www.reddit.com/r/explainlikeimfive/comments/59xxeq/eli5why_do_we_have_dejavu_in_different_amounts_of/" ], [] ]
[ "url" ]
[ "url" ]
7in216
What causes that feeling in joints that makes you want to crack your neck? Why is cracking your neck so satisfying and addicting?
Repost
explainlikeimfive
[ "dr008yr" ]
[ "Yo ho ho! Yer not alone in askin', and kind strangers have explained: 1. [Why does cracking / popping your back feel so good? ]( URL_2 ) ^(_47 comments_) 1. [ELI5: Why does cracking your knuckles/back/neck feel good? ]( URL_1 ) ^(_29 comments_) 1. [ELI5: why does cracking your neck and fingers feel so good? ]( URL_8 ) ^(_4 comments_) 1. [ELI5: What cracking your neck actually does. ]( URL_0 ) ^(_2 comments_) 1. [ELI5: What happens when you pop your neck and is it dangerous to do to yourself? ]( URL_6 ) ^(_5 comments_) 1. [ELI5: What exactly happens when you \"pop\" your neck or any other body part? ]( URL_7 ) ^(_26 comments_) 1. [ELI5:What happens when I crack my neck/back, and why does it give me relief? ]( URL_5 ) ^(_2 comments_) 1. [ELI5: Why do we feel relief when we \"crack\" our knuckles/joints? ]( URL_3 ) ^(_20 comments_) 1. [ELI5:What happens when I crack my neck? Why does it feel better than just stretching? Is it harmful or helpful?? ]( URL_4 ) ^(_1 comment_)" ]
[ 6 ]
[ [ "https://www.reddit.com/r/explainlikeimfive/comments/49tfu0/eli5_what_cracking_your_neck_actually_does/", "https://www.reddit.com/r/explainlikeimfive/comments/2m2fmp/eli5_why_does_cracking_your_knucklesbackneck_feel/", "https://www.reddit.com/r/NoStupidQuestions/comments/5srdvz/why_does_cracking_popping_your_back_feel_so_good/", "https://www.reddit.com/r/explainlikeimfive/comments/597spn/eli5_why_do_we_feel_relief_when_we_crack_our/", "https://www.reddit.com/r/explainlikeimfive/comments/1mvee7/eli5what_happens_when_i_crack_my_neck_why_does_it/", "https://www.reddit.com/r/explainlikeimfive/comments/1lcney/eli5what_happens_when_i_crack_my_neckback_and_why/", "https://www.reddit.com/r/explainlikeimfive/comments/5jfmq7/eli5_what_happens_when_you_pop_your_neck_and_is/", "https://www.reddit.com/r/explainlikeimfive/comments/6eqxfb/eli5_what_exactly_happens_when_you_pop_your_neck/", "https://www.reddit.com/r/explainlikeimfive/comments/6ui7kq/eli5_why_does_cracking_your_neck_and_fingers_feel/" ] ]
[ "url" ]
[ "url" ]
lczilg
- Why do we get the munchies when we smoke marijuana?
Biology
explainlikeimfive
[ "gm33282" ]
[ "Here are a couple reasons in brief: 1) a subset of brain cells (POMC neurons) that typically signal \"I'm full\" switch to an \"I'm hungry/craving\" signal. 2) An increase in dopamine makes eating more enjoyable. 3) An increased level of the \"I'm hungry\" hormone (ghrelin) is pumped out. So you not only feel hungry, but giving into the craving has high reward." ]
[ 6 ]
[ [] ]
[ "url" ]
[ "url" ]
hr64il
Why can you see clearly underwater with goggles but not without them?
Other
explainlikeimfive
[ "fy23wyv", "fy23z3x" ]
[ "The curvature of the front surface of your eye is optimized for an air to lens interface. Goggles contain air, thereby making your eye work correctly. They have a flat front face, so that the air-plastic-water interfaces don't cause additional distortion. When water is in contact with your eye lens, it has a lens to water interface. While this sorta works, water has a different index of refraction than air, and the lens lacks sufficient adjustment to focus clearly." ]
[ 17 ]
[ [], [] ]
[ "url" ]
[ "url" ]
8p83z1
Why do only some displays display HDR? Isn't a display just a series of pixels that display different color values? What makes an HDR display different?
To clarify, if my normal LCD display does not display HDR, what makes it different, hardware wise, from an HDR compatible one? I understand the HDR process when taking a picture, and the layering of differently exposed images, but then how can I view the HDR image on my non-HDR phone?
Technology
explainlikeimfive
[ "e098wvq", "e097lnx" ]
[ "An HDR screen is a different concept to taking HDR photos. Although both relate to using a wider range of colours. A non-HDR screen only has 256 different levels of red, green and blue. So there's only a certain range of colours and brightness it can display. HDR screens increase this so there is a wider range of colours/brightness levels. True HDR screens are supposed to be capable of more brightness, but it's not just the maximum brightness that matters, it's how many levels of brightness each colour channel has. So for example you could have a movie in HDR which for the most part looks the same as the non-HDR version, except explosions are brighter. If you just turned the brightness up on the non-HDR version, everything would just look washed out because the brightness goes up for everything. The HDR version has more brightness levels to work with." ]
[ 14 ]
[ [], [] ]
[ "url" ]
[ "url" ]
a9csol
Why do massages feel good from others but not from yourself?
Other
explainlikeimfive
[ "eci9urs" ]
[ "Your brain has feedback loops and knows when you are touching you, causing it to anticipate what will happen, vs. someone else touching you, which it can't anticipate." ]
[ 22 ]
[ [] ]
[ "url" ]
[ "url" ]
ibdj9e
What made the GOMAD (1 Gallon Of Milk A Day) diet helps skinny people gain weight? And why is it not good for health?
I saw guys from fitness community suggest this diet to skinny people, so they can gain weight and do workout better. What’s the science behind it?
Biology
explainlikeimfive
[ "g1umr9b", "g1umt80", "g1uvms6" ]
[ "The science isn't anything complex. Milk is to fatten up baby cows. Its has a lot of fat, sugar, and carbs. All of those things will be converted into fat if not used, so drinking a gallon of milk a day is a good way to make that happen." ]
[ 7 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
7u6u6v
Why is it called "gasoline" when it's a liquid?
Other
explainlikeimfive
[ "dti20f8", "dtid9l3" ]
[ "The original fuel compounds used in automobiles were derived from coal gas. Later, one of the early petrol/oil motors that was very popular was called \"Cazeline\", and it's believed (though not thoroughly documented) that the term \"gasoline\" was coined as a portmanteau of sorts of \"gas\" and \"Cazeline\", and was often rendered in those days as \"gazeline\"." ]
[ 18 ]
[ [], [] ]
[ "url" ]
[ "url" ]
b0txxe
When you are hungry, what causes your stomach to make a churning/grumbling noise and why is it so loud?
Biology
explainlikeimfive
[ "eii1nxk" ]
[ "If I remember correctly from high school anatomy, the inside of your stomach is covered with ridges or wrinkles called rugae. When there is food in your stomach, these help to churn the slurry to aid digestion. As the stomach empties, however, the stomach constricts and the rugae rub together, causing a gurgling or grumbling sound. Someone please correct me if I'm wrong, it has been a long time since high school. XD" ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
khgczt
why do library apps have due dates for digital books?
If you download your local library app here in the states; you can check out a vast amount of books/movies/music. Why do they have a due date if you get a book? It is digital. It isn’t hurting anyone if it’s “checked out”. If you don’t finish it before your date you have to recheck it out and lose your place in the book.
Technology
explainlikeimfive
[ "ggkwi1y", "ggkwrjq" ]
[ "Because books are protected by copyright. So the library can't just give away \"free books\": it would be a crime. The library is allowed to lend a limited number of digital copies of a book: digital books are treated like kind of physical books by the law. So the library needs you to return it in order to give it to someone else." ]
[ 24 ]
[ [], [] ]
[ "url" ]
[ "url" ]
e8ixkt
If semen is only 2-5% sperm what is the rest of semen made up and what is it’s purpose, also why do men ejaculate 100-300 million sperm if only one is required to swim to fertilization?
Like the question says what are the remaining contents of semen. In addition, can sperm survive inside the vagina or anywhere else without the remaining contents of semen. Also how does this compare with the contents in pre ejaculate. If sperm can’t survive without the contents of semen can they survive in the contents of pre ejaculate.
Biology
explainlikeimfive
[ "fachlzs", "facg9tn" ]
[ "Seminal fluid contains proteins, sugars, vitamins and other nutrients. Sperm are living cells. They require nutrients to survive their voyage. They also require a medium in which to travel. Without a fluid they wouldn't be able to travel. It also contains enzymes to counteract vaginal fluids. The vagina is a hostile environment, very acidic. Many sperm die before making it anywhere near the egg. The sperm is ejaculated at such high velocity that many of them die on impact with the vagina. The sperm must then find a path of least resistant through the acidic vaginal fluids. Many go into a dead end, become surrounded and die. They must then travel up one of two fallopian tubes to reach the egg. Typically only one tube actually contains an egg so half will travel up the wrong tube and die. Once reaching the egg it doesnt take one sperm to get in. Usually the first sperm to the egg is not the winner. The egg has a protective coating. The tip of the sperm contains enzymes meant to erode the eggs protective coating. The enzymes of one sperm is not sufficient to get through. It will deplete its enzymes, tire out and die. One of the sperm after that will complete the erosion and once one sperm makes it into the egg it sets off a chain reaction that basically solidifies the egg coating preventing any other sperm from getting through. The rest die. Being a sperm is very dangerous. The fact that you even made it is a miracle." ]
[ 21 ]
[ [], [] ]
[ "url" ]
[ "url" ]
64zs0s
Why do two negative numbers yield a positive number when multiplied together?
I know that it's a pretty commonly accepted fact but I haven't really found a mathematical foundation for this part of integers.
Mathematics
explainlikeimfive
[ "dg6cw1a", "dg6fi04", "dg69t61", "dg6a0vy", "dg6jrwg", "dg69tic", "dg6c7nj", "dg6dwsn", "dg6n954", "dg6ef9m", "dg6gwqw" ]
[ "I read a really good explanation on this sub a while back so I'll take a shot at it (I'm on mobile so please pardon any mistakes). So, you can either walk forwards or backwards. This would represent positive and negative. This is the same for a recording. It can be played forward or in reverse. -If you play a recording forward of you walking forward, the end result is you walking forward in the video (positive*positive). -If you play a recording forward of you walking in reverse, the end result would be negative as you are going backwards in the video (negative*positive). -If you play a recording in reverse of you walking forwards, the end result will be negative as you are going backwards in thw video (positive*negative) -Finally, you can play a recording in reverse of you walking backwards. The result will be positive, as you are appearing to walk forwards in the video (negative*negative)." ]
[ 918 ]
[ [], [ "https://www.reddit.com/r/explainlikeimfive/comments/3r90cw/eli5_why_does_multiplying_two_negatives_give_you/cwm35qn/" ], [], [], [], [], [], [], [], [], [] ]
[ "url" ]
[ "url" ]
mo38z3
why do heroin users seem to get acne?
Biology
explainlikeimfive
[ "gu19qf8", "gu19mo4", "gu29v50" ]
[ "I mean. It's not really the drug. I work with opi addicts all day and many of them don't have acne. But it could be because they have a higher tenancy to not take care of themselves properly. They may be homeless and therefore dirty because they don't have a place to shower. They could pick at their skin which could damage it and may look like acne." ]
[ 32 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
lvye5n
What does this quote mean?
"and who looks at a shadow when then have a flame? Who would ever choose a monster over a god?” - **King's Cage by Victoria Aveyard.** I get the god part, but I don't get what the shadow part means. "When then have a flame?" Is that even correct english? If it's old english for "they" then I still don't really get the meaning behind it or how I could apply it to life.
Other
explainlikeimfive
[ "gpeeq5g" ]
[ "I took it to mean “ why would you be scared of the dark when you have the torch/light? You are the cause of the shadow” kinda thing. I could be totally off base here and wrong but that’s my interpretation" ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
5umnlz
My 9 year old LG Dare still has a full charge despite not being turned on or charged in 7 years. My IPhone 6 Plus that I powered off two weeks ago is completely dead. Why?
Technology
explainlikeimfive
[ "ddvc3ig" ]
[ "Different batteries behave differently. Your 9 year old LG is probably using a low-discharge NiMH battery, which keeps its charge better. Your iPhone is using a Li-ion battery, which self-discharges more quickly. However, it shouldn't be dead in two weeks. I have iPhones that I haven't powered in 6 months that still have some large amount of capacity left. You powered it down/powered it off, correct? Some more info (see the self-discharge section): URL_0" ]
[ 16 ]
[ [ "https://en.wikipedia.org/wiki/Lithium-ion_battery" ] ]
[ "url" ]
[ "url" ]
8w4yu3
What is the simplest way to get my coals ready to cook food on a charcoal grill?
Chemistry
explainlikeimfive
[ "e1squws" ]
[ "Buy a Chimney! Weber Stephen Company 7429 Rapid Fire Chimney Starter, Silver URL_0" ]
[ 4 ]
[ [ "https://www.amazon.com/dp/B07B5BHKDZ/ref=cm_sw_r_cp_apa_2KtpBbHPAA6K9" ] ]
[ "url" ]
[ "url" ]