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blaifo
Why can organs be donated after we die but not blood?
Biology
explainlikeimfive
[ "emmvq7r" ]
[ "Livor Mortis sets in pretty quickly- it's the fourth stage of death. The blood sinks to the \"bottom\" of the body - basically, whatever point is lowest. Without the heart agitating the blood, the red blood cells sink to the bottom of the liquid, and then the rest of the blood seperates by density. So it may be possible to take the blood, but it's really not worth the effort." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
c2cga0
- Why do People Lift Tires Instead of Other Objects?
Other
explainlikeimfive
[ "erj7p6u", "erj7q0j" ]
[ "They're heavy, they're readily available, they're cheap, they're challenging and awkward to move (flip) and the tend not to damage things or surfaces if dropped or roll into something. That's what I'd guess." ]
[ 10 ]
[ [], [] ]
[ "url" ]
[ "url" ]
jnz1fr
Why the tongue after getting burned by hot food keeps the burn sensation for a long time, and how certain foods help with pain relief?
Biology
explainlikeimfive
[ "gb4k8sf" ]
[ "Capsaicin, the chemical responsible for the spicy sensation, is fat-soluble. This means it will stay bound to our taste buds until it's either broken down or something it's soluble in carries it off. Water is ineffective because capsaicin isn't soluble in it. Milk does a very good job of reducing the burning because capsaicin binds to its fats and is carried off to your stomach. Other fatty foods have the same effect." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
6ef43g
Why does the government and the central bank have to be different entities? What different agendas do they pursue?
Economics
explainlikeimfive
[ "di9t09w" ]
[ "Central banks are concerned with long-term economic stability and growth. They're supposed to be entirely focused on that long-term objective. If a banker at the Federal Reserve can enact policies that improve the economy over 20 years, they've done a good job. Government is often run by people who may have long-term goals, but very often have huge incentives for short-term gains even at the expense of long-term stability. If a politician can manipulate the markets to make it look like they're producing huge amounts of growth within a 2-, 4-, or 6-year span, they look like they've done a good job and might get re-elected. However, that same plan may destabilize the economy long-term, leading to big losses. Who cares as long as they got re-elected last term, right? If government controlled the central bank more strictly, who knows what the agenda of either would be, who stands to gain from which policy, are the policies actually helpful to the economy or are they helpful to a certain politician's constituents, etc.? Having separate entities with separate goals makes it a bit easier to trust that each seeks to accomplish different things for different reasons, and the *argument* between them is what usually produces sound policy on both sides when they can reach an agreement on something." ]
[ 7 ]
[ [] ]
[ "url" ]
[ "url" ]
86ko7a
how do rebel or insurgent armies get their weapons?
Other
explainlikeimfive
[ "dw5r3ia", "dw5uxh6", "dw5rszd" ]
[ "There is far less honor among weapons manufacturers than you might think. No, they don't bat an eye when they get an order that big because that's their business. And yes, weapons manufacturers are often subject to their country's laws that may prohibit sales to certain countries or rebel forces, so that's why there are also brokers who act as middlemen between said weapons manufacturer and said prohibited customer." ]
[ 15 ]
[ [], [ "https://www.theguardian.com/world/2014/aug/14/uk-britain-arms-supply-kurdish-forces-iraq-isis", "https://en.wikipedia.org/wiki/Ra%C3%BAl_Reyes#Aftermath", "https://www.stripes.com/news/kurdish-peshmerga-getting-heavy-weapons-for-mosul-push-1.404284" ], [] ]
[ "url" ]
[ "url" ]
lw07t8
How are small children able to master gymnastics moves, such as a handstand, seemingly effortlessly?
It took my little cousin less than a week to do a handstand for thirty seconds, yet I am still attempting to do it against a wall. How?!
Biology
explainlikeimfive
[ "gpemp3g", "gpeqmrn", "gpfdyhg", "gpemly7", "gpfh4zp" ]
[ "Children usually have less mass and a lower center of gravity than grownups. It is literally easier to do a handstand at 5 than at 25. Less strength and skill and coordination is required and even if you account for the fact that adults have more strength, and better coordination than week clumsy children, they come out ahead. It is also harder to hurt yourself when falling down as a small child due to physics and children are generally more fearless and will not hesitate when adults would, which helps with gymnastics a bit." ]
[ 48 ]
[ [], [], [], [], [] ]
[ "url" ]
[ "url" ]
jobvc2
Why does Jupiter not have rings comparable to that of Saturn?
Physics
explainlikeimfive
[ "gb71pn8" ]
[ "All of the gas giant planets have rings, Saturn's are just the most prominent. Rings are basically just big clouds of dust and ice that orbit a planet, like a moon. It's possible that material dates back to the formation of the solar system, or perhaps it is the debris left over from a moon destroyed in a collision or ripped apart by the planet's gravity. The fact that Saturn has such big and bright rings may just be an accident of timing. They're estimated to be only about 100 million years old (dating back to when the dinosaurs lived) and may dissipate in another 100 million years. In astronomical terms that isn't a very long time at all, so it seems not to be a stable arrangement." ]
[ 9 ]
[ [] ]
[ "url" ]
[ "url" ]
kfi21g
why do we feel emotions
Biology
explainlikeimfive
[ "gg8jb4p" ]
[ "Because they give us as an species an advantage. Fear is a easy example. It is good to feel scared of heights, darkness etc." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
99zvr4
Why do buildings always seem to fall apart faster when no one is in them for a while?
I mean, I understand overgrown/dying plants and getting dusty inside, but why does the structural integrity of the building seem to deteriorate when someone isn't living in the building for a few years? Like I feel like living in a home for 10 years, the buildings structure would be perfectly fine. But a home abandoned for ten years, somehow the building is nearly gonna collapse and paint/wallpaper is chipping/peeling away. What am I missing that's happening here?
Other
explainlikeimfive
[ "e4ro1s5", "e4roca9", "e4rr0bh", "e4sejxs", "e4sdowl", "e4si1sd", "e4sihon", "e4silxl", "e4sbooi", "e4s9xxc", "e4szy2i", "e4snmnc", "e4sona0" ]
[ "Water. Once the outside fails enough to let water enter, the water rapidly destroys the structure. Dust and spiders won't do any real damage, but water will level a building in just a few years. Rot wood, dissolve drywall, melt plaster. If the place freezes in the winter, that gives water even more power to freeze in the cracks and break down concrete and masonry." ]
[ 6443 ]
[ [], [], [], [], [], [], [], [], [], [], [], [], [] ]
[ "url" ]
[ "url" ]
5nsjne
Why is it bad to quickly restart an air conditioner compressor?
Technology
explainlikeimfive
[ "dcdz2zd" ]
[ "The air conditioner has a motor which compresses the gas hence it is called the compressor. If you start the compressor after a period of being off then the electric motor, the compressor, starts against no load. It does not begin pumping against a compressed gas. It is easier for a motor to start against no load. If the air conditioner was running then there is likely to be compressed gas still in the system. That is why the compressor is there. The compressor starts from zero speed against a load just as you might begin pedaling up a hill on a bicycle. Electric motors draw a large current getting started. They will draw even more when starting under a load." ]
[ 5 ]
[ [] ]
[ "url" ]
[ "url" ]
9chax9
For people with solar panels, how does the electrical company buy power off you if you have more than enough?
Other
explainlikeimfive
[ "e5apho5" ]
[ "I get credited at the end of the billing cycle for excess at a drastically lower rate then they sell it for" ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
a0ya92
How does sudden tempreture change happen? Like how do we go from being -6 degrees Celsius to +8 degrees Celsius within a span of 12 hours? Does the major factor in these changes have anything to do with solar flares or pressure systems?
Physics
explainlikeimfive
[ "eald35i" ]
[ "It has zero to do with solar flares. If you have a big swing like that and you don't live in a desert, then most likely a warm mass of air has moved in to replace a colder one, rather the air itself changing temperature. If you do live in a desert, then the sun alone can do that - things warm up in sunlight and cool off in its absence. Water requires a lot of energy to heat up, so the more water is around you, the less temperature will change from direct heating. That's why islands tend to be mostly the same temperature year round, and deserts have huge temperature changes just between day and night." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
c9goq1
What exactly is a pyramid scheme?
Economics
explainlikeimfive
[ "esy1x5e", "esymsnb", "esy1yni" ]
[ "First, send me 10 dollars. Then ask 4 of your friends for 10 dollars each. Ask them to do the same thing. You can keep half of whatever money you get but give the rest to me. Then you'll find out what a pyramid scheme is." ]
[ 56 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
7eqq9o
Considering the huge profits to be had from cannabis, how does it "hurt big pharma"?
Economics
explainlikeimfive
[ "dq6r6t3" ]
[ "Because right now they have pretty much zero infrastructure to get into the pot game; they don't have the facilities to grow, harvest, process or package it. When pot came out of the shadows, a whole school of cladestinely developed technique and art came with it, and as a result their competition isn't starting from zero, and is locking itself into a dramatically unexploited niche with a product that the big companies can't directly match without significant work and investment. In other words, someone other than them has an advantage in one particular field, and it's pissing them off." ]
[ 5 ]
[ [] ]
[ "url" ]
[ "url" ]
8hnc53
Why is it that when someone's photo is taken and they look at the camera, it looks like they are staring right at you no matter what angle you see it from?
If I take a photo of someone and they look at the camera lens, no matter what angle you view the picture from, it looks like they're staring at you. Why is this? Wouldn't they just stare forward??
Physics
explainlikeimfive
[ "dyl0dyo", "dyl8q4w" ]
[ "Well when looking at that photo no matter how you look at it you're seeing it from the perspective of the camera. And to the camera they were looking right at it." ]
[ 5 ]
[ [], [] ]
[ "url" ]
[ "url" ]
6pzcjw
"Continuous everywhere but differentiable nowhere." - Weierstrass function
How's that possible? I can't comprehend the paradox in this concept. Can you help me?
Mathematics
explainlikeimfive
[ "dktcqih" ]
[ "Derivatives rely upon the concept that if you have a small enough change in input, the function's response can be modeled as a line. The weirstrass function is made up of an infinite number of cosine functions, and so it never really \"settles down\" to a line as you zoom in. It's wavy all the way down, and as such, has no derivative while it is still continuous." ]
[ 10 ]
[ [] ]
[ "url" ]
[ "url" ]
da6eso
Why do economists say that rent control is bad?
Economics
explainlikeimfive
[ "f1njjx8", "f1nia4j", "f1nlwhh" ]
[ "Because rent are dependant on supply and demand. When the supply of habitation is lower than the demand the price go up. Rent control artifically keep the price of rent low, but this doesn't change the core problem. If the rent stay low, it become less interesting for people to build affordable habitation. So either they build less in that city, or they build something else that is more profitable for them. The supply and demand stay the same, so the price of construction go up and the price of land go up too. The only realy way to keep rent low is by increasing the supply and rent control is doing the opposite, it's a temporary solution that make thing worst on long term." ]
[ 35 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
83mm9x
Why does North America have an obsession with grass/lawn's?
Culture
explainlikeimfive
[ "dvixrgq" ]
[ "I don’t think it’s just a North American thing. It’s often about “keeping up appearances “ - like ironed shirts, polished shoes, etc. Tells everyone “we’ve got our shit together”." ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
l339v2
how can there be conditions that make you not feel specifically pain or make you not have a gag reflex? Touch is such a broad sense that it seems strange for a defect to single out one aspect and not at least dampen ones sense of touch as a whole.
Biology
explainlikeimfive
[ "gkaxmkz", "gkb9z22" ]
[ "We think of humans as having 5 senses, but this isn't strictly true. Humans have closer to 14 to 21 senses depending how you catergorise them. Touch is a very broad and simplistic way of categorizing human sense, in reality touch is several really complex systems that overlap. Damage one system and others can still be running." ]
[ 7 ]
[ [], [] ]
[ "url" ]
[ "url" ]
c612ju
Are human beings still evolving?
Biology
explainlikeimfive
[ "es5fvhz", "es5gqy6", "es5gims", "es5jcgm" ]
[ "Yes. Just in different ways now. What used to be considered a quality of survival is different. What is “weak” and “strong” has changed, so the process of natural selection is not the same as adaptive animal species. We have medicine. Technology. Public health management. Big muscles and tall height don’t inevitably lead to procreation anymore since our drive as a species is more complex than furthering our genetic lines." ]
[ 10 ]
[ [], [ "https://www.mirror.co.uk/news/real-life-stories/fourteen-members-same-family-12-6448609" ], [], [] ]
[ "url" ]
[ "url" ]
6s19cj
Why is there a barcode on taser confetti (non lethal weapon), but nothing similar to that on bullets (LETHAL weapon)
Yes, theres ballistic, but nothing like a taser with a universal database.
Other
explainlikeimfive
[ "dl99cq0" ]
[ "First, the amount of Tasers that get fired recreationally, in practice, and in service are extremely small compared to the amount of bullets that get fired. People shoot firearms for fun and for sport, not just defense and practice. The same can't be said about Tasers. Another big thing is that a shot out of a Taser costs about 30 bucks (according to Taser's website.) A full metal jacket 9mm Luger cartridge, if you aren't buying bulk, costs in the area of 10-15 cents. This makes putting barcodes on every single bullet in the world totally unfeasible. It's also worth mentioning that you can handload your own ammunition, and cast your own bullets, I do both. Edit: Also, many bullets are destroyed upon impact with a hard object, shed their copper jacket in the case of armor piercing bullets, or expand to a completely different shape in the case of jacketed hollow points. The point that you can make your own bullets kind of negates the idea of serializing them." ]
[ 22 ]
[ [] ]
[ "url" ]
[ "url" ]
5v2bdp
Could certain sensory input overload our brains and cause it to "crash"?
EDIT: Could large amounts of sensory input overload our brain and cause it to crash?
Biology
explainlikeimfive
[ "ddys6ww" ]
[ "I think I saw a video that explained what being autistic was like. It seems as though over stimulus is really hard for someone with autism to deal with which may result in sort of a crash. Normally your brain filters out the less important information. Like if you're computer was at the limit and just stopped processing the input from your keyboard while it caught up." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
l8vnk3
Why do videos or images in 4K still look more crisp than 1080p, on a 1080p display ?
Technology
explainlikeimfive
[ "glep4ug", "gleu79g" ]
[ "4k content is generally encoded at very high bitrates, and the media it's stored on support higher bitrates in their specifications. Downsampling a very high quality image can achieve better quality than just displaying an initially lower quality/resolution image at it's native resolution." ]
[ 6 ]
[ [], [] ]
[ "url" ]
[ "url" ]
l0nwgu
Why do people write (he/him) instead of just (he) or (him)?
Other
explainlikeimfive
[ "gjuiv69", "gjuqrtd", "gjuilw2" ]
[ "It’s for the less common ones where people may not know the matching term. Examples are (xe/xem) or (ve/ver)." ]
[ 11 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
5qawp3
Why isn't the foliage cut off the top of a pineapple?
Why do people who run pineapple farms not cut off the foliage of the top of a pineapple before selling it onto a supermarket for example? isn't it virtually useless?
Other
explainlikeimfive
[ "dcxqzv6", "dcxpvl3", "dcy9j83" ]
[ "Floridian here. I have about 30 pineapples growing in my garden. The stem at the top of the pineapple serves several purposes: * First, it keeps the fruit from drying out. If you were to cut it off, juice would leak out, the fruit would become dry and taste worse. * Second, it serves as an indicator of health. If the stem is green and stiff, that means the pineapple is in good shape. If it's brown, crusty, decayed, pulls off easily, etc that means that the pineapple is ripe/rotting. * Lastly, you can plant it and grow a new pineapple plant! That's how I made my garden. Cut the pineapple about a quarter inch below the stem, so that the stem has a disc-shaped bulge at the bottom. Plant it about 3-4 inches deep. As long as it's warm and wet, pineapples will tolerate just about any kind of soil. EDIT: Fun fact: While most plants produce fruit every year, pineapple plants only produce fruit every third year. Not so fun fact: I found out the hard way that you can be allergic to pineapple plants without being allergic to the fruit. Apparently [they are immunologically distinct]( URL_1 ). Five minutes of working in my garden is enough to make me start itching; fifteen minutes will make me break out in hives. EDIT 2: [Here]( URL_0 ) are some pictures of about half of my garden. (The less weedy half)" ]
[ 86 ]
[ [ "http://imgur.com/a/jjXm1", "https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1131219/" ], [], [] ]
[ "url" ]
[ "url" ]
7v3m0p
Why do our eyes go black when we stand up after sitting for a while?
Biology
explainlikeimfive
[ "dtp8hfw", "dtp9vk2", "dtpixp3" ]
[ "You're probably moving too fast. That's *orthostatic hypotension*, and that basically means your blood pressure to your brain dropped a lot from moving too fast. That's why you get dizzy and your vision goes blurry. Maybe try getting up a little more slowly in the future." ]
[ 35 ]
[ [], [], [ "https://en.wikipedia.org/wiki/Orthostatic_hypotension" ] ]
[ "url" ]
[ "url" ]
jsj0zl
Why did pirates burry treasure if they would never recover it?
Other
explainlikeimfive
[ "gbzfcae", "gbzgbof", "gbzfdqz" ]
[ "They almost never did, it's a trope we got from culturally significant books like *Treasure Island*. Only William Kidd was known for sure to have buried treasure on one occasion, intending to use it as leverage to bargain for his freedom were he ever captured. He did not succeed." ]
[ 34 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
cow6lk
how do we reliably know how much co2 we put globally into the air?
Other
explainlikeimfive
[ "ewljjgl", "ewlv8oq" ]
[ "Satellite imagery can show up the amount of CO2 in the atmosphere URL_0" ]
[ 8 ]
[ [ "https://climate.nasa.gov/climate_resources/99/graphic-measuring-carbon-dioxide-from-space/" ], [] ]
[ "url" ]
[ "url" ]
gw7203
How do doorbells work?
Engineering
explainlikeimfive
[ "fst7pch" ]
[ "Depends on the type of doorbell, many new ones are wifi enabled, but traditional doorbells that most people are familiar with are buttons/switches with electrical wires running through them, through the wall, and to a chime usually built into a wall somewhere closer to the middle of the house, though some are right inside the door. Pushing the button completes an electrical circuit which causes the \"bell\" to go off" ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
aqy80t
How does our brain store song lyrics even from 5 years ago but forget some important things that happen right away?
Biology
explainlikeimfive
[ "egjeud0" ]
[ "I would it have to do something with emotions. If you really liked the song and it made you feel good there is higher probability of remembering it. You also remember most things from childhood because it was related to some strong emotion either good or bad." ]
[ 8 ]
[ [] ]
[ "url" ]
[ "url" ]
8ryebk
Why do animals have so many different shapes of pupil and colours of iris?
In particular why do goats have alien eyes? Also, why does ELI5 automatically shut down questions that include the word e-v-o-l-v-e? What is the problem with that? I was forced to reword my question. Is this a fact-based reddit or are you trying to appease the creationists?
Biology
explainlikeimfive
[ "e0vg1jy" ]
[ "The eye is actually fairly uncomplicated from an evolutionary perspective. It only takes a few thousand years to grow, and every small evolution is a massive advantage Dawkins did a great presentation on \"what use is half an eye\": URL_0" ]
[ 4 ]
[ [ "www.youtube.com/watch?v=Nwew5gHoh3E" ] ]
[ "url" ]
[ "url" ]
868o61
If English is a Germanic language, why is it so difficult to read texts/understand speech in other Germanic languages?
I also speak Spanish, and I find it a lot easier to read text/partially understand spoken Portuguese and French (both of which are Romance languages), whereas the other Germanic languages (Dutch, German, Danish, etc.) are almost completely indecipherable for me as a native English speaker.
Culture
explainlikeimfive
[ "dw37fhd", "dw38v4l", "dw39h42", "dw3eck0", "dw3j6b9", "dw4p87e", "dw3hc9n", "dw3g2kd", "dw6p2lp" ]
[ "English is the dirty bastard of Germanic languages. It is not German, it is rooted in the same early language group that gave us modern German/Dutch/Icelandic and the rest. English was heavily influenced by the Romance language group, particularly through old French, when the invading Normans brought it along. Toss in some Gaelic influence, more Latin for the 'scholarly' types, and you end up with a language that bears only a passing resemblance to its Germanic cousins." ]
[ 86 ]
[ [], [], [], [], [], [], [], [ "http://russian-language-for-couples.com/img/russian-cases.gif", "https://www.amazon.com/Our-Magnificent-Bastard-Tongue-History/dp/1592404944/ref=sr_1_1?ie=UTF8&qid=1521707136&sr=8-1&keywords=our+magnificent+bastard+tongue" ], [] ]
[ "url" ]
[ "url" ]
htnx7k
what is cancer?
My dad just got diagnosed with stage 4 colon cancer and was told he has 2-5 years left to live. I feel very uneducated in this subject and was wondering if the kind people of reddit could help me out?! Why are there stages of cancer? How does chemo work? How do they predict a 2-5yr window? What is the best way to support my dad over the next few years? Thanks
Biology
explainlikeimfive
[ "fyhwaqj", "fyhxca0", "fyi4hxu" ]
[ "Best to start at URL_0 Read everything on the site. What happens in a nutshell is that cells replicate all the time. Normally they replicate to a point and stop naturally. Mutations in cellular machinery cause this process to go haywire and the cells start reproducing out of control. This out of control replication forms a tumor, each of the replicated cells also replicates out of control. Normally these cells stick together in a clump. Metastasis is where one or more cells breaks loose and is transported to another part of the body through your circulatory system. It's here that cells can start forming tumors all over the place including in the brain, heart, or other vital organs." ]
[ 10 ]
[ [ "https://www.cancer.org/cancer/cancer-basics/what-is-cancer.html" ], [], [] ]
[ "url" ]
[ "url" ]
dpzsxh
How to internet service providers, manipulate how fast or slow your internet connection is without any of their software on your device?
I've noticed some local ISPs have different rates for different speeds. How do they do accurately choke your internet connection without having to do anything to your device?
Technology
explainlikeimfive
[ "f5zrt2q", "f5zxtnc" ]
[ "Imagine a water hose. On one end is connected a garden sprayer. The other end is connected to the water faucet. If you squeeze the handle, you can control how much water comes out the sprayer. But the guy standing at the faucet can begin reducing the amount of water coming to the sprayer. If he reduces the water enough, it doesn't matter how much you squeeze the sprayer. The water is your internet speed. You and your sprayer are all your internet gear (modem, router, etc.). The guy at the faucet is your ISP." ]
[ 42 ]
[ [], [] ]
[ "url" ]
[ "url" ]
cg0scu
Why does a long stretch feel so satisfying, and what triggers it.
Biology
explainlikeimfive
[ "eudsfzd" ]
[ "I believe it’s because your muscles slowly tighten up and lose blood flow when immobile and stretching increases blood flow and relieves the tension." ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
i1lctm
How come time differs by hours in different timezones but not by minutes
why isn't there a gradual change in minutes between timezones (e.g : Its 4:20AM where i live but 8:20PM in The US)
Other
explainlikeimfive
[ "fzy8qvm", "fzy8pks", "fzy83lx", "fzyadti" ]
[ "FWIW, thee are some timezones that are offset by 30 minutes. But like the other post says, the timezones are just logical groups so that those near enough can operate on the same \"time\"." ]
[ 18 ]
[ [], [], [], [] ]
[ "url" ]
[ "url" ]
883ecv
Who is Jordan Peterson and why is he widely talked about in politics?
Other
explainlikeimfive
[ "dwhjdax", "dwhjjj0", "dwhju51" ]
[ "For \"what is this thing that Reddit's talking about\" questions, /r/outoftheloop is probably a better place to look than ELI5. They have [several past threads on this topic]( URL_0 )." ]
[ 4 ]
[ [ "https://www.reddit.com/r/OutOfTheLoop/search?q=jordan+peterson&restrict_sr=on&sort=relevance&t=all" ], [], [] ]
[ "url" ]
[ "url" ]
bb1y4x
Do ships use ocean currents like airplanes use the jet stream to get around faster? Is there an equivalent ocean "jet stream"?
Engineering
explainlikeimfive
[ "ekfv5pl", "ekgdga7" ]
[ "Absolutely! Off the easy coast of the United States is he Gulf Stream, it runs northish about 5 miles per hour. Northbound ships will stay in the Gulf Stream while southbound ships will avoid it." ]
[ 13 ]
[ [], [] ]
[ "url" ]
[ "url" ]
6conpv
Why does the fridge have a lightbulb in it but the freezer compartment doesn't? Is it too cold for the filament, would the bulb heat it up too much?
Engineering
explainlikeimfive
[ "dhw6rjs", "dhw8e16" ]
[ "Both of my freezers have lights. Although now that I think about it perhaps the older style \"fridge in the bottom, freezer on the top\" ones might not have had a light in the freezer compartment. Perhaps it was a heat issue and this has been resolved with the advent of LED lights?" ]
[ 7 ]
[ [], [] ]
[ "url" ]
[ "url" ]
60c1ef
When something claims to be water resistant up to 50 meters, what happens after 50 meters?
Technology
explainlikeimfive
[ "df53mtd", "df55qv0" ]
[ "The pressure of the water at that point would overcome any sort of resistance. The deeper down you go... The more water pressure is experienced." ]
[ 14 ]
[ [], [] ]
[ "url" ]
[ "url" ]
hirqoa
What is a Carb and what does your body do with it?
What is a carb actually and when you consume them what is the process you body goes through to use as energy? I’ve checked google and many other sources and nothing gives a concrete understandable answer. Too much food science has confused the subject entirely. I just wanna know how your body uses carbs.
Chemistry
explainlikeimfive
[ "fwhwilt" ]
[ "A carbohydrate is what it sounds like: a chemical made out of carbon, oxygen, and hydrogen arranged in a certain pattern called a sugar molecule. The “carbs” that we mean when we say carbs in an everyday sense are single sugar molecules (monosaccharides), pairs of connected sugar molecules (disaccharides), or chains of sugar molecules connected together (polysaccharides). Simple carbs are the first two things, while complex carbs are the third. Fiber is also a polysaccharide (a long string of sugars connected together), but we can’t digest it, so it doesn’t really count as a carb even though it is a sugar in a chemistry sense. When we eat carbs, they are broken down into simpler things that have less energy (through a process called glycolysis). We are able to harvest some of this energy lost during the chemical reaction in a way that allows us to make two energy currencies in the body: ATP and NADH. Your body can also use other things like fat and protein for energy, but breaking down carbs through glycolysis is one of the main ways our body gets energy from food when we eat a conventional diet." ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
hj68tv
What is resonance in physics?
Physics
explainlikeimfive
[ "fwke5bt" ]
[ "Resonance is the frequency at which an object likes to vibrate. For example, guitar strings make different sounds when you pluck them because they naturally vibrate at different frequencies due to being different thicknesses. If you shorten any of the strings, it will also make a higher pitch. Resonant frequency is related to the inverse of the length of the vibrating object. This is because the inverse of frequency is wavelength, and if the wavelength matches the length of the vibrating object, there will be resonance. So if you force a vibration at a particular frequency, the object will vibrate better the close it is to its resonant frequency. In fact, if the it is exactly its resonant frequency, and there is no damping, the object's vibrations will getting larger and stronger indefinitely! Think about pushing someone on a swing. They are swinging at a certain frequency. If you push them close to that frequency, their swinging will get bigger. This resonant frequency is how singers can supposedly break wine glasses with their voice, why washing machines will shake the floor when spinning at a certain speed, and why microwaves can heat up water molecules. It is particularly imporrant when designing bridges and tall buildings, because the right frequency caused by the wind or and earthquake can do a lot of damage. Look at the Tacoma bridge for example: URL_0 URL_1" ]
[ 6 ]
[ [ "https://youtu.be/XggxeuFDaDU", "https://youtu.be/mXTSnZgrfxM" ] ]
[ "url" ]
[ "url" ]
en80q6
what is happening physically when someone is singing well vs. when someone is not
Biology
explainlikeimfive
[ "fdwa5og", "fdvzd17" ]
[ "On a basic level, to sing well you have to sing the correct pitches at the correct times. A well trained singer can hear the pitch they are supposed to hit, and know if their voice is slightly high or low (sharp or flat) and adjust as they go. They also hit the notes at the correct times, not late or early, and hold them for the full duration they’re supposed to. A poor singer may not know they are slightly out of tune, they may be slightly early or late on notes, bend into pitches rather than stepping into them, or cut notes short. On a more advanced level, a good singer will adjust their volume to match the shape of the melody. They may add vibrato on long notes. They’ll definitely breathe in between phrases, not in the middle of them. Poor singers may try to add too much vibrato, or add runs/extra notes to cover the fact that they’re not comfortable." ]
[ 6 ]
[ [], [] ]
[ "url" ]
[ "url" ]
6a35gl
How did we determine how long is a "day" on Jupiter since all the longitudinal gas bands move at different speeds
As seen in a video in this article URL_0
Physics
explainlikeimfive
[ "dhbdygo", "dhbgw1m" ]
[ "We calculate the day length of Jupiter by radio emissions from its magnetosphere. The rotation of the magnetosphere is the official basis of the rotational speed and period." ]
[ 16 ]
[ [], [] ]
[ "url" ]
[ "url" ]
babkbm
Why are FM signals interrupted when underneath buildings or bridges?
Physics
explainlikeimfive
[ "ekadgqx" ]
[ "Radios use special waves to send their messages. Dense stuff like bridges usually have metal in them, and metal is really good at blocking those special waves. If those waves can't get through, your car's antenna can't pick them up. It's like putting a pillow over your ears- you might be able to still hear a little bit, but it's really muffled because the sound is being absorbed by the pillow. Slightly > 5 explanation: bridges/buildings often have rebar, which is concrete that is strengthened with metal bars. The metal bars often create a mesh which acts like a Faraday cage, which generally blocks incoming radio transmission. This is why you often get poor cell service in big buildings. Someone please correct me if I'm wrong here." ]
[ 7 ]
[ [] ]
[ "url" ]
[ "url" ]
bho8gz
Besides just "oil", why is modern U.S. allied with and catering to Saudi Arabia?
Other
explainlikeimfive
[ "eludlr5", "eluct54", "elvi89a", "eluejk6", "elud21i" ]
[ "The Saudi Arabian government allows the US to keep military bases in their country, which gives us a great local place to monitor the situation throughout the Middle East and respond quickly without the need for establishing new supply lines in the area. They also buy TENS OF BILLIONS of dollars worth of military equipment from us. Planes, tanks, missiles, you name it." ]
[ 19 ]
[ [], [], [], [], [] ]
[ "url" ]
[ "url" ]
fmo80g
Why are xrays printed on a clear piece of plastic and held up to a light box, instead of just black ink on white paper?
Technology
explainlikeimfive
[ "fl56b8n", "fl5c6py", "fl59unw", "fl58obu" ]
[ "They aren't \"printed\" they are a photographic exposure with the \"film\" reacting to the X-rays to produce a negative as happened with cameras before digital cameras existed." ]
[ 148 ]
[ [], [], [], [] ]
[ "url" ]
[ "url" ]
b7czpy
How did Silicon Valley become the "mecca" of computer technology? Could this have happened anywhere like New York or Chicago or is there something specific about the geographic or political climate that allowed Silicon Valley to become what it is?
Other
explainlikeimfive
[ "ejqufex", "ejqualn", "ejr9pcd", "ejrbqzu", "ejr91c5", "ejrc8u7", "ejray3s", "ejrc54y" ]
[ "William Shockley, one of the men who invented the transistor spent time there as a child. He founded his company, Shockley Semiconductor and headquartered it there. He hired 8 engineers for his new company, and was such a bad manager they abandoned him and founded their own company under the Fairchild business (they made camera and plane parts). This became Fairchild semiconductor. They're called the \"Traitorous 8\" and this is considered the birth of startup culture. One of the unique parts of Fairchild's culture was that the engineers would leave the company to found their own businesses, called the \"Fairchildren.\" One of the most famous Fairchildren is Intel, which was founded by two of the Traitorous 8 themselves - Gordon Moore and Robert Noyce . It turns out Fairchild and the Fairchildren did some exceptional things with technology, and made a lot of money. The venture capital culture began to grow, which provides the financial backbone for startups. TL;DR blame Shockley and Fairchild and all the great ideas spawned from them and the money that followed." ]
[ 442 ]
[ [], [], [], [], [], [ "http://www.paulgraham.com/siliconvalley.html" ], [ "https://www.inc.com/magazine/19940201/2758.html" ], [ "https://www.youtube.com/watch?v=ZTC_RxWN_xo" ] ]
[ "url" ]
[ "url" ]
5rlzt3
(and not American): What is "Alt Right" and why is it a big deal that their sub was banned?
Repost
explainlikeimfive
[ "dd8b5mk", "dd8b7oh" ]
[ "Alt right is a term used to describe a group of mostly young white males who feel that they have become disillusioned and lost in the shuffle. With things such as affirmative action, there has been a big push for women, minorities, and members of the LBGT community to have more representation in jobs and culture (certainly not limited to starring roles in movies and TV). Because of this push, these young white men feel that there's no place for them, that because they're not minorities or women, that their opportunities are diminishing. It's a big deal because they support racist, sexiest, and xenophobic ideals. They see those women and minorities as a threat to their livelihood. I mean, imagine having the feeling that you don't belong in society? You're going to find someone to blame. (This is the anecdotal part, please don't delete this comment) Personally, as a young-ish white male, I don't agree with the alt right movement but I completely understand where they're coming from. I will fully admit that there has been more of a push for inclusion, but the fact is that most of the jobs are still given to white males." ]
[ 29 ]
[ [], [] ]
[ "url" ]
[ "url" ]
8o0n9r
What causes the clouds to look purple during a thunderstorm?
Other
explainlikeimfive
[ "dzzs1cm" ]
[ "The sky is usually blue. Similar to a sunset, the storm clouds cause a small amount of red light to scatter. Blue + red = purple." ]
[ 17 ]
[ [] ]
[ "url" ]
[ "url" ]
6jhk2e
During space travel how do we navigate? North South East and West doesnt work once we are off earth..
Engineering
explainlikeimfive
[ "djeag6u", "djeiz8u", "djesbsi" ]
[ "In direct relation to the position of two other known points such as the Earth and the Sun." ]
[ 3 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
5mr03v
Why do movies and TV shows use old phones and odd-looking texting and computer platforms?
Please excuse my possible misuse of terminology, I'm not in that field. I dont understood why in 2016 some movies and TV shows still use flip phones. Thanks in advance.
Other
explainlikeimfive
[ "dc5o0ea" ]
[ "This varies a lot. The props department is often tasked with finding phones for the actors. Buying new phones is expensive, especially since the phones is going to get abuse on set and might not survive. They also need to disguise the phones so you can not determine the brand of the phone as that could get them in trouble with the manufacturers. So it is much easier to get something they have in storage that they got for cheap some time back and is already made unrecognizable in the last movie it appeared it. Sometimes there may even be stunt replicas of these phones made already. Other times they may even do it simpler and let the actor use his own phone since he have it on set already and just make sure the brand is not shown. The texting and computer displays is also quite different. Again you would not want to show anything that could get you in trouble with well established brands. You also need to make sure the screen is clear of any clutter like the clock (unless required by the plot), alerts, unused buttons, portraits, etc. that would make the screen harder to read in the few seconds it is shown on camera. You also need to be able to let the actor do one thing and the phone do another thing and make sure it is repeatable for different takes. You may also theme the screens to better fit the movie or TV show. All this would be hard to do with authentic software. You might use authentic software for the initial consent but then recreate it with your modifications so it is easier to do on screen." ]
[ 6 ]
[ [] ]
[ "url" ]
[ "url" ]
7je4jl
Why did Spanish become so widespread in Spanish colonies, while French turned into various creoles languages?
Culture
explainlikeimfive
[ "dr5nc3a", "dr5nrlc" ]
[ "The French colonies in the Americas did not tend to become independent. Instead they were transferred to the control of other powers (Texas holdings went to Mexico, Louisiana went to the US, Quebec went to the British, etc). These powers sent their own colonials in and the languages blended (which is what a creole language is)" ]
[ 7 ]
[ [], [] ]
[ "url" ]
[ "url" ]
kj9608
if US is trillions in debt, who are they in debt to and what are the assets?
Economics
explainlikeimfive
[ "ggvfmr0", "ggvin5x", "ggvfqr9", "ggvrpmz", "ggvf2j8", "ggvo1e1" ]
[ "Here is the information directly from the source: the US Treasury website. I've sent the link to the FAQ but the site has links that probably answers the questions. [ URL_1 ]( URL_0 ) In theory and practice, it is difficult to give a \"valuation\" of the assets of the government of any country. For example: how to put values against national parks, forests, mineral and other deposits, federal lands, the value of the armed forces, the value of civil services etc etc." ]
[ 21 ]
[ [ "https://www.treasurydirect.gov/govt/resources/faq/faq_publicdebt.htm", "https://www.treasurydirect.gov/govt/resources/faq/faq\\_publicdebt.htm" ], [], [], [], [], [] ]
[ "url" ]
[ "url" ]
ih1ng9
what is the difference between interest rate and the rate of return?
Economics
explainlikeimfive
[ "g2x8o2u", "g2xfzug" ]
[ "Interest rate is how much you pay every time period (weekly, monthly, yearly) that you have not paid back a loan or debt principal (the amount you borrowed). You can convert weekly, bi-weekly, monthly or yearly rates into each other. A rate of return is how much an investment of $x turns into $y. I.e., if you invest (or better for this example, lend out to someone) $100 and after some period your investment is now worth, or you receive back from the loan $110, your return is $10. Your rate of return is $10/$100 or 10%. If you're the bank, your rate of return on a loan you give out is the sum total of all the interest calculated on that loan, expressed as a percentage of the principal. Note that an interest rate isn't the same as the interest amount. The total interest you pay on a loan or a debt depends on the interest *rate* in conjunction with how frequently the interest is calculated and whether it compounds or not." ]
[ 3 ]
[ [], [] ]
[ "url" ]
[ "url" ]
ailklx
Why do passengers have to stay boarded on a plane for 12+ hours when there is a issue?
Other
explainlikeimfive
[ "eeolme2" ]
[ "Generally speaking, when in a vehicle flying over a country, passengers can't disembark from such vehicle outside of emergencies without technically entering that country. However, that airport did not have staff to handle immigration/customs entry at the time, so passengers could not legally leave the aircraft." ]
[ 5 ]
[ [] ]
[ "url" ]
[ "url" ]
7rk93i
If an older person is wealthy.. would it not be wiser for them to distribute some of that wealth the way they want BEFORE they die?
Economics
explainlikeimfive
[ "dsxjkis", "dsxis8b" ]
[ "Yes. It's very common to do this. There are lawyers and accountants who specialize in it. It's not a magic pill. You can't give unlimited gifts to people without paying taxes, because to the government, that looks really suspicious. If I remember correctly, the present rules in the US are, you can give individuals up to $14k per year as gifts ($149k for your spouse if they're not a US citizen, unlimited if they are), and if you give any one person more than that, it counts toward a $5.5M lifetime gift limit. If you go over that lifetime gift limit, the giver has to pay a gift tax. (Paying for someone's education or medical care doesn't count toward the limit; neither do contributions to charities.) There are also things you can do like owning land in common with someone else; in that case (and remember, this is ELI5 chat, not legal education), when you die, the property stays with that person, instead of going into your estate to be divided up according to your will. Anyway, even if you do all that stuff, it doesn't necessarily prevent legal fighting afterwards. Inheritance law has ins and outs." ]
[ 8 ]
[ [], [] ]
[ "url" ]
[ "url" ]
7rf5to
Why do kids' shows frequently have an "ask and response" component (ie Dora the Explorer)? Do the kids believe the characters understand them?
I've recently found myself watching TV with preschoolers. Several of the shows have parts where the characters ask the viewer questions, then wait for an answer. The kids I was with would respond to the questions like Dora could really hear them. Why is this such a common aspect of kids' TV? Do they know it's part of the show, or do they think the characters can understand them? Culture
Culture
explainlikeimfive
[ "dswfx83", "dswfxy5", "dswlhyb", "dswg4wa", "dswmwqe" ]
[ "Very young children have an under-developed model of how the world works. In some cases they may literally believe they are heard. In other cases they may simply enjoy playing along *as if* they are being heard -- a game." ]
[ 18 ]
[ [], [], [], [], [] ]
[ "url" ]
[ "url" ]
62ljtm
Money laundering
I'd really appreciate an example-based explanation for this. EDIT: Thanks for the quick and great answers!
Other
explainlikeimfive
[ "dfnglng", "dfngysl" ]
[ "So I sell illegal drugs, and I have tons of cash. If I deposit this cash at my bank, the IRS/government will become suspicious. So instead, I purchase a local car wash business. I then claim parts of my cash horde as business profits. This process takes \"dirty\" money and channels it through a legal business to make it \"clean\"." ]
[ 3 ]
[ [], [] ]
[ "url" ]
[ "url" ]
6us2n7
How come when someone tries to open a car door at the same time that someone unlocks the door, it won't open/unlock?
Technology
explainlikeimfive
[ "dluzqdd" ]
[ "Does not happen in modern cars. There's a latchkey in older cars that, if you tension the door lock wire at the wrong time, will cause it to go flaccid - which will result in the door lock not opening. So you press the lock button, it tenses an actual wire, and if the door handle is opened at that exact moment it can't pull any tenser, so it does not unlock. Modern cars have circuitry to prevent that situation." ]
[ 14 ]
[ [] ]
[ "url" ]
[ "url" ]
jq8esw
How does the human body know that it should start producing more blood when a person is gaining weight- getting bigger?
Biology
explainlikeimfive
[ "gbkzm6p" ]
[ "Your kidneys detect a decrease in oxygen in your blood and in response release a protein which signals your bone marrow to produce more red blood cells." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
6g7dsm
why does new/freshly healed skin sting so badly when touching chrome/metal?
Recently got a cut and the new skin is healing over it, accidentally touched it against the taps in the shower and felt a really intense metallic stinging. Other than that the area doesn't hurt to touch any other time.
Biology
explainlikeimfive
[ "dip0562" ]
[ "Outer layer of skin is dead, nerves are under skin, new skin doesn't have many layers, nerves are closer to surface, shower tap must've been different temperature than 32C, drastic change in temp causes mild pain in addition to exposed nerves, voila." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
5xp1g4
Why does blood taste the same as metal coins?
My finger was bleeding earlier and the only thing I could do is lick it for the time being. I realized it tastes very similar to that metallic taste coins have.
Biology
explainlikeimfive
[ "dejr1hh" ]
[ "There's metal in your blood. To be specific, iron. It's used to transport oxygen throughout your body. It tastes slightly rusty because oxidized iron is basically what creates rust." ]
[ 27 ]
[ [] ]
[ "url" ]
[ "url" ]
d293ni
Why does spicy food burn just as much on the way out as it does on the way in?
Biology
explainlikeimfive
[ "eztjag7" ]
[ "Capsaicin, which gives most spicy foods their effect, cannot be broken down by digestion. So the compounds enter and exit the body without being deconstructed, so it has the same effect on nerves throughout the body." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
9cgvw9
What exactly does it mean to die instantly?
Biology
explainlikeimfive
[ "e5alrso" ]
[ "It's a phrase that doesn't have any medical meaning; generally cause of death is noted, but 'quickness of death' is not medically relevant. The media use it in instances where a sudden impact or injury caused a person to die in a way that was very quick. Typically though, the nature of these incidents (eg. Car crash fatality) is such that the time between the injury being sustained and the person dying isnt able to be accurately measured, due to lack of witnesses." ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
5sgll0
How is the observable universe (approximately) 93 billion lightyears in diameter if the big bang occured 13.7 billion years ago?
I suppose my question could be naive, but I was under the impression nothing could travel faster than the speed of light, so even if the universe expanded at exactly that speed, it could only be 27.4 billion lightyears wide?
Physics
explainlikeimfive
[ "ddew7cv", "ddevkqn", "ddewqxl", "ddf8e59" ]
[ "Space itself is expanding. We know this because the light from distant galaxies is redshifted (stretched out), and the farther away they are the more redshifted they are. So while it is natural to think of the time since the Big Bang as a bunch of galaxies expanding out into empty space - in which case the universe would, as you say, be only 27.4 billion years across - the expansion of space *itself* means the galaxies have moved farther than that. There are some problems with it, but the 'spots on a balloon' metaphor is pretty good... the galaxies are moving away from the Big Bang, but space itself is expanding too. (This has some interesting repercussions. At some distance, the speed at which distant galaxies are moving away from us becomes faster than the speed of light, and we will never see those galaxies again... they will have become causally disconnected from us.)" ]
[ 89 ]
[ [], [], [ "https://youtu.be/gzLM6ltw3l0?t=6m50s" ], [ "https://en.wikipedia.org/wiki/Accelerating_expansion_of_the_universe" ] ]
[ "url" ]
[ "url" ]
ncemio
Does increasing time gap between 2nd dose increase period of vulnerability after 1st dose?
Recently, India increased the time gap between first and second dose of the AstraZeneca vaccine from the earlier 4-6 weeks to 6-12 weeks. This is supposedly based on studies which suggest that increasing the time gap between first and second doses increases its efficacy to 90%. However, this does mean that a person getting the first dose would have to spend 3-4 months without being fully vaccinated. Can someone explain how increasing the time period Between first and second doses increases overall efficacy? Also, does this also increase efficacy of the first dose?
Biology
explainlikeimfive
[ "gy4o5a7", "gy4wgoh" ]
[ "Yes that is the math. However, only one shot does give **some** protection. This gives a larger group of people some protection quicker in exchange for it taking longer to get people full protection." ]
[ 5 ]
[ [], [] ]
[ "url" ]
[ "url" ]
hlrv0l
what's the difference between being fetishized for our physical attributes vs someone being attracted to us for them?
Other
explainlikeimfive
[ "fx0utqx", "fx0x9xy" ]
[ "If it's a fetish, then you as a person don't really factor in. You're just a means of growing the feet or whatever. If someone finds you physically attractive, that is part of the whole person they are attracted to. And often you are more attracted to the body because of the person." ]
[ 16 ]
[ [], [] ]
[ "url" ]
[ "url" ]
bigeqh
Whats the difference between a Gas Giant planets and a tiny sun?
Is it just size, or does something need to happen with the gases for it to be classified as a sun?
Physics
explainlikeimfive
[ "em0hddt" ]
[ "The difference is there is fusion in the core of them. A gas giant have not fusion and a main sequence star have hydrogen1 fusion. There is also Brown dwarf in between the have some fusion but not hydrogen1 You need enough pressure and temperature in the core for fusion to start. That depend on the mass of the object so is is the mass that determine if it become a gas gigant a brown dwarf or a main sequence star. If you had approximate 13 Jupiter and put them together they would form become a brown dwarf and if you had 80 they become a star. So is is if fission happen that is important but that directly depend on there size A gas gigant can have a size to 13x Jupiter and there is not fusion in them. Jupiter have a mass of 1/1047 of the sun so \\~0.1% Then you get a brown dwarf with a mass off approximate 13 juptiers to 75-80 Jupiter that is nor really a planet or a star but something in between. They have enough mass to fusion Deuterium(hydrogen2) and litium7 but not Hydrogen1. & #x200B; They you have a red dwarfs that start at 75-80 Jupiter masses or 0.074-0,08 solar masses and they stop at about 0.5 solar masses. The have fusion of Hydrogen1 but are a lot colder on the surface then our sun and we can see any of them with a naked eye on the sky" ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
ldkbvr
why is it believed by some economists that national debt can be beneficial for a country’s economy?
Economics
explainlikeimfive
[ "gm6biy5", "gm6bjle", "gm6aw2d", "gm6o3os" ]
[ "Government debt is much more like Corporate debt than personal debt. As individuals we're taught that debt is bad and we should do everything we can to get out of it. While Companies and Nations borrow money all the time and it's a perfect sane and reasonable thing to do so long as you don't go too far. One economic theory goes that the government should borrow money during a recession. By putting money into the economy, creating projects and jobs, the government is helping the economy get running again. The government makes it's money through taxes so it's said that for every dollar the government spends it gets 60-70 cents back in taxes. The stronger the economy, the more money the government brings in. So in the short term it's better for everyone if the government borrows money to help get the economy rolling. Where-as if the government doesn't borrow money it instead needs to perform austerity measures, which means cutting back programs to save money. This in turn cuts back on jobs and programs that people need to survive, which makes the crisis worse and makes it last longer. Another factor is much of the savings industry is built on Government debt. Pension plans, 401k's, life savings, etc are heavily invested in Government Bonds because it's a very safe investment. So even though the government is borrowing money from Joe Taxpayer, Joe does get something out of it. Both in the very programs that are being paid for by that debt, and by the interest he makes on his savings." ]
[ 23 ]
[ [], [], [], [] ]
[ "url" ]
[ "url" ]
a5d12p
Recalling lyrics perfectly when associated with music?
Why are we able to recall, word for word, lyrics to entire songs we haven't listened to in over a decade, so long as the song is playing, but couldn't provide them on demand without the music?
Biology
explainlikeimfive
[ "eblo7kz", "eblzrzh" ]
[ "Your brain associates the lyrics to the music while you listen to the song, and if you hear it again, it remembers what comes next, aided by the memory aid of the melody. To put it short, the melody is a memory aid." ]
[ 14 ]
[ [], [] ]
[ "url" ]
[ "url" ]
5qvu28
Why do people like red velvet cake? Is there a reason besides the visual appeal?
Culture
explainlikeimfive
[ "dd2gxjc" ]
[ "The redish color originally came from dutch process cocoa, which had a dark red color. It's a mildly chocolate cake. People love the red color so they add it to make it ever more red, but the cake itself is traditionally a mildly chocolate cake." ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
7xk71q
What exactly is happening when you stand up too fast or have a big stretch and your body feels like it's going to shut down?
I've had this happen tons of times where I go to stand up and it's like some crazy tunnel vision happens and all the sounds slow fades into a low pitched buzz, then suddenly it stops and I'm normal... same thing happens when I'm doing a big long stretch... am I slowly dying? please ELI5
Biology
explainlikeimfive
[ "du8vqyo" ]
[ "The blood pressure in your body needs to readjust. When standing up too fast the blood rushes from your brain (where its doing some very vital work)" ]
[ 7 ]
[ [] ]
[ "url" ]
[ "url" ]
ab1wsd
How is it that a single boil on a body causes feverish symptoms but acne all over the face/body does not have that cumulative effect if they are both infections?
Biology
explainlikeimfive
[ "ecwur6i" ]
[ "Acne is typically caused by clogged pores, not necessarily infections, although some infections might contribute. That being said, acne/boils are symptoms of a problem and not themselves the 'cause' of the problem, so the \"number of skin disruptions\" is not necessarily indicative of how dangerous the underlying illness(or lack thereof) may be." ]
[ 7 ]
[ [] ]
[ "url" ]
[ "url" ]
79rxoc
How're elevators replaced?
Engineering
explainlikeimfive
[ "dp4bvea" ]
[ "Removing a old one can be done by taking it apart at the bottom level. Either disassembly the parts or just cutting it apart. The new elevators are build from parts that fit trough the door on the lowest level. The harder part to install is likely guide rails etc in the shaft Here is a video of presentation of how a large manufacturer replace a old elevator with a new URL_0" ]
[ 3 ]
[ [ "https://www.youtube.com/watch?v=D4KV7Z6SknE" ] ]
[ "url" ]
[ "url" ]
61oi8k
Is there an explanation for bored-eating?
Biology
explainlikeimfive
[ "dfg1ts9", "dfgfhv8" ]
[ "I'm bored, how could I feel good the easiest? Oh! Eat something! The feel good feelings are the easiest to access. Like the path of least resistance." ]
[ 26 ]
[ [], [] ]
[ "url" ]
[ "url" ]
73vifl
How do plants crack rock and concrete?
How can a plant get enough leverage to break a huge rock or a piece of concrete apart? What's happening on the cellular/molecular level?
Biology
explainlikeimfive
[ "dntj3py", "dnthi4q" ]
[ "If you think about breaking a rock with a hammer, it's a finite amount energy required all being conveyed at the same time. In the case of a plant, the cells divide on a microscopic level with each division requiring a small amount of energy for the process and expelling a small amount of kinetic energy during mitosis. Once a plant's vine or root starts growing within a crack it not only moves forward into space but also expands as a cylinder along the stalk. Instead of the instant force of a hammer, the plant exerts the same amount of total force over a longer period of time." ]
[ 51 ]
[ [], [] ]
[ "url" ]
[ "url" ]
759ykx
When an insect gets trapped in a car and transported miles away, is the insect able to find its way back? If not, will insects who live in groups be able to join a new hive/colony in the new location or will they get rejected?
Other
explainlikeimfive
[ "do4lza0" ]
[ "Generally speaking such an insect would not be able to find its way home unless it was still within the normal range of its community (going several miles might not do that for a bee). Communal insects do not accept members from other groups except under unusual circumstances (adopted bee queens) so they would likely just die in short order." ]
[ 7 ]
[ [] ]
[ "url" ]
[ "url" ]
gi5uw1
Why does dust settle no matter how much you clean? And why does it seemingly keep adding up?
Other
explainlikeimfive
[ "fqcrjg7" ]
[ "Most of what makes up dust comes from you and your body— it’s dead skin cells, dead hair cells, pollen and dirt that you drag in from outside, pet fur and skin cells, etc. It builds up because living creatures occupy the space and move all throughout it, discarding dead cells as they go. Cleaning it cleans it, and then you make more, so you need to clean again." ]
[ 6 ]
[ [] ]
[ "url" ]
[ "url" ]
8n6z49
Why is it safe to buy exposed meat at Asian wet market with ambient temperature of over 30°C, when supermarkets are wrapping them air-tight and keeping them in refrigerators?
If you don't know what Asian wet markets look like, here's a quick Google image search: [ URL_0 ]( URL_0 )
Biology
explainlikeimfive
[ "dzta9km", "dzt9yfk", "dztjaqp" ]
[ "They're fresh. The animal is slaughtered then sent to the market immediately. At the market, the meat is usually sold out in a few hours. Slaughterhouse to end buyer, it's around 6 hours." ]
[ 44 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
8twb3m
Large scale debt
As I know it the basic form of debt goes like this: I borrow $100 from Joe, so he lends it to me, but before he gets paid back he ends up needing $1,000 which he borrows from Bill. Bill ends up needing $1,000 before Joe can pay it back to him and for some reason he can't get anyone to lend him money. And then Joe dies. So Bill's screwed and has to suffer in a way. America is in trillions of dollars of debt, so when it's on such a huge scale, who is at the end of it? Who is getting screwed so bad and ripped off? Because surely you can't pay off 14.6 trillion dollars in a lifetime, even if it's over a ton of people, let alone trace it back to where it even started. So someone somewhere must be getting screwed over, right? And what about when debt is forgiven..? Doesn't that mean someone somewhere isn't getting paid for their work? There's definitely a huge part of this I'm missing and I'm hoping someone could explain it to me. Sorry if it's a dumb question.
Economics
explainlikeimfive
[ "e1asywu", "e1aqwoe", "e1aqej5" ]
[ "Your perception of debt seems to be slightly confused. No offence. After all, that's what ELI5 is for. It might be easier to explain debt from the other side: the lender. So, say a bank lends 100 people $100 each for one year. They charge 10% interest. This is obviously massively simplified, but it'll do. Now let's assume that 80 of those people pay back their debt, fine, no issues. The bank receives $8,800. 15 people pay it back, but pay it back late. The bank has to get this money back, and so this costs them $2 per person. So, in total, the bank receives $1,620 from those people ($100 original loan + $10 interest - $2 for the cost of getting that money back x 15 people). Finally, 5 people never pay it back. For whatever reason, the bank simply can not get any of that money back. So, that's $0. In total, the bank lent $10,000 and received $10,420 back after a year. Because banks lend money to borrowers from other people who save money with the bank, the bank has to pay some interest to those savers. Let's say they pay 3% interest. That's $300 to those savers. This leaves the bank with a profit of $120. This despite the fact that 5 people simply never repaid any money back to the bank. Does this example answer your question? If not, let me know and I'll get more specific." ]
[ 8 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
5zj0mb
How can some food / diet drinks have 0 calories?
Repost
explainlikeimfive
[ "deyflyo" ]
[ "The drinks are usually just flavored water with artificial sweeteners like acesulfame-k that pass right through the body. The konjac pasta is a type of fibre that is not absorbed by the body. It fills up your stomach though so makes you feel full. People who are trying to lose weight should probably not eat them, and instead lots of green beans and other water\\fibre rich vegetables which do the same thing but also provide vital nutrients." ]
[ 4 ]
[ [] ]
[ "url" ]
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7bdksq
How do they make old songs sound clear in movie trailers?
Technology
explainlikeimfive
[ "dph41o9", "dphgca8", "dphbd4u", "dphivhg", "dphltzu", "dphn6m8", "dphpgud", "dphnwfj", "dphnz0h" ]
[ "Large Hollywood movie production studios have contracts with many large record labels for access to their original master recordings of music, and for more popular songs, the record labels can also sometimes provide the individual unmixed track recordings of those songs. Basically, the movie studios can get separate high quality recordings of the drums, vocals, horn section, guitar, piano, etc, and completely remix the song to fit the context of the movie/trailer. As far as making the tracks sound “clear”, this is either just done by having high quality recordings, or the audio engineers have added some sort of compression, equalizer, or other form of effects processing to the tracks to give them and crisper, more modern sound. EDIT: These multitrack master recordings and the individual tracks are referred to as “stems.” I was not aware of this term at the time of writing." ]
[ 1859 ]
[ [], [ "https://cdn.lynda.com/video/137180-140-635180851189681333_338x600_thumb.jpg" ], [], [], [], [], [ "http://www.americanphotomag.com/inside-iron-mountain-vault-housing-lunch-atop-skyscraper-negative" ], [], [] ]
[ "url" ]
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jdj1ft
Why do restaurant salads taste so much better than any salad I try to make at home, even if I use the restaurant's dressing?
Other
explainlikeimfive
[ "g98hfyk", "g98xy37", "g98o3wm", "g9aa4ty", "g98ixw2", "g9a9m93", "g99c4rj", "g98wthx", "g98glaj", "g99z5gx", "g997mu2", "g9aah5i", "g9aakyr", "g98qr8s", "g9a49zb", "g99khc4" ]
[ "Frankly a lot of times salt is the answer. Use it liberally if you want your food to taste good. Also, just because you're using their bottled dressing doesn't mean it's actually the same thing they use in house. They might, for instance, be making essentially the same dressing fresh everyday or every week. There are also often preparation techniques that can take a dish to the next level. Like with a salad, we used to mix the croutons in the dressing to get them drenched before mixing the rest of the salad, which would give the croutons a muuuch better texture." ]
[ 990 ]
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8bz1q4
How do authors make money if their book is free with Kindle Unlimited on Amazon?
Economics
explainlikeimfive
[ "dxast0m", "dxaqadj", "dxaq9ws" ]
[ "One I'm qualified for! Amazon's pricing stuctures are a little weird sometimes. (I'm going to stick to dollars for this, for simplicity's sake, but there's an equivalent -- but not necessarily equal -- structure in place for every currency.) First, let's talk sales. Basically, you get paid 70% for the sale of your book, *if* your book is priced between $2.99 and $9.99. If it's not, you get paid 35%. That means that for a book that's priced at $0.99 needs to sell six times as many copies as one that's priced at $2.99 to get the same amount of money in your account. This is basically a form of protective price fixing, both for Amazon the seller and the writers; it stops writers engaging in a sort of 'race for the bottom', where they're continuously trying to undercut each other. So what about Kindle Unlimited? Well, as other people have said, we get paid based on how much reading is done. KU has a bigass pot attached to it. This month, for example, it's twenty million dollars. All of the books in the Kindle Unlimited program have their pages-read counted, and the pot is divided between them. This usually works out at a little less than half a cent per page. (By my loose calculation, a 'page' from Amazon's perspective is about 150 words.) This doesn't sound like a lot -- and it isn't -- but it can add up. However, this is Amazon's second swing at making a KDP system that worked; it used to have a different approach. What we call KDP 2.0 (the current system) works on a per-page basis. The old system, KDP 1.0, worked on a per-borrow system. If you downloaded a book and read more than 10% of it, the authors would get a fixed price -- usually around $1.35 -- *no matter the length of the book*. This was controversial among certain sections of the author community, because a 6,000 erotic short story would earn you the same amount as that 600,000 page fantasy novel that someone had worked for years on. (I was in the former group, so I wasn't exactly pleased when the new rules came in, but what can you do?) This had a big impact on the romance writing community in general, with a lot of us jumping ship from erotic shorts (which was where the money used to be; KU 1.0 made it very easy to make a living if you hit the right niche) to full-length romance novels. The other important thing to remember is that signing up for the KU program grants Amazon exclusivity over your work -- you're not allowed to sell it elsewhere for a three month period, recurring as long as you stay in the program. You're not even allowed to give it away for free. That means that they don't have to worry about people getting your book elsewhere, so if you're popular, they're getting a bigger cut. Even if they take a bit of a loss on KU in general, it helps to keep them the dominant force in epublishing by squeezing other publishers out of the marketplace." ]
[ 51 ]
[ [], [], [ "https://kdp.amazon.com/en_US/help/topic/G201541130" ] ]
[ "url" ]
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crnnuq
What is the origin of the current use of the word "flex?"
Only in recent weeks, I have seen a serious uptick in the number of people using the word "flex" in place of words like, "show," "display," and "present." What is the origin of this alternate usage?
Culture
explainlikeimfive
[ "ex77ybp", "ex75gv9", "ex7crrd" ]
[ "well, flex and -flect come from the same latin root meaning to bend. When you flex a muscle (most notably your biceps, to show off) you bend your arm. so that’s that etymological root for flexing your muscles. in terms of flexing on someone, you’re showing your strengths, the same way flexing your muscles shows off your physical strength." ]
[ 8 ]
[ [], [], [ "https://www.google.com/amp/s/www.urbandictionary.com/define.php%3fterm=Flex&amp=true" ] ]
[ "url" ]
[ "url" ]
89ub1g
- how do so many sportstars, actors, etc. that make millions of dollars end up in debts?
Other
explainlikeimfive
[ "dwtkccd", "dwtkkdf" ]
[ "Because they, like many others in our society, spend more than they make. Yes, they make a lot. They also spend > a lot." ]
[ 7 ]
[ [], [] ]
[ "url" ]
[ "url" ]
fqp7zj
How does salt bring out the flavor of food?
Chemistry
explainlikeimfive
[ "flrg6w5", "flrulq3" ]
[ "In the simplest form, it reduces the water content, which allows you to taste more of the actual food. Water is very good a diluting pretty much everything, flavor included. So, you add some salt and it mixes with the water causing some of it dissolve the salt." ]
[ 6 ]
[ [], [] ]
[ "url" ]
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5nqqon
A woman in the U.S. was killed by a superbug resistant to all known antibiotics. Why can't our adaptive immune system fight off bacteria? Isn't that why the immune system is a) there and b) adaptive?
Biology
explainlikeimfive
[ "dcdjcpc", "dcdq0wu", "dcdm65v" ]
[ "You immune system is doing this all the time, you're just not realizing it *precisely* because it does it so well. Not only it can eliminate bacterial, fungal and via infections, it also protects you against multicellular parasites and even kills potentially malignant cells so you don't develop cancer. Without it you'd probably drop dead in a week or so due to some random infection." ]
[ 10 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
kgvshu
how we know we can trust the web browser with our usernames and passwords?
The browser sees all the logins we make, with websites, usernames, and passwords in plain text. How do we know it isn’t remembering them and sending them back to the mother ship? It’s possible someone would inspect the code of open source browsers and make a noise if they found something, but even then most people don’t build from source, so there’s no need for the source to be the same as the downloaded app. 2FA makes it less of a problem, but there are still plenty of juicy pickings for the evil browser.
Technology
explainlikeimfive
[ "gghhzj4", "gghitbj", "ggi7iej", "gghxmrd" ]
[ "This is actually a pretty good question. Bottom line is, you can’t. Most browsers are closed source, so you can’t “know”. But there are security researchers who are always watching what software and how it communicates looking for unexpected behavior. There’s also the risk to the company. If one instance were confirmed of the software doing something like that, it could totally ruin the whole company." ]
[ 45 ]
[ [], [], [], [] ]
[ "url" ]
[ "url" ]
jq4h5a
Why do people get random urges to clean their room, bathroom, etc. ?
Other
explainlikeimfive
[ "gbjn7wr" ]
[ "Because you have an exam to study. What else are you supposed to do?" ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
ajdcz4
What is a database package, and how does it work?
I'm trying to get my head around this but the Oracle PLSQL resources I'm looking at don't clarify much. I need a really simple analogy. Help?
Technology
explainlikeimfive
[ "eeusdk0", "eeusz4z" ]
[ "A package is basically like a folder. It helps you organize stuff. A database allows you to create your own functions. (E.g. a function could delete an entry from two different tables.) You can put multiple of those into a single package and then grant a user the authorizations to use every function in this package." ]
[ 3 ]
[ [], [] ]
[ "url" ]
[ "url" ]
7icdpo
What exactly happened during the Enron Scandal in 2002?
Repost
explainlikeimfive
[ "dqxsphn", "dqxqvqc", "dqxv0wc" ]
[ "In trying to make their oil company cool, they wanted to think of themselves as a trading firm. So they started doing things like trading energy or Internet traffic. Because of their mindset, all they cared about the cash on the books at the end of each quarter. In order to get cash on the books when they had none, they devised many accounting tricks to increase the cash on the books and decrease losses. Not in reality, just in reporting. For example, they would sell portions of loss making subsidiaries, where there was some weird rules like if they sold a tiny fraction of the subsidiary, then they won't be the owners and not have to report the losses. Something like sell 7% of a electric plant and not have to report loses of that. In addition, the would write down all potential gains in the first year of contract. Like if they had a contract in 1997 to provide water to a region for 7 years, they guessed your much money they would make from that over the seven years and book all the potential profits in the first year. Regardless if they ever made any money or profit, they didn't go back and revise down. So it looked like they made a lot of money. Back to the selling assets, their CFO, while CFO, started a hedge fund which would be the place that Enron would sell their fractions troubled assets. As CFO, he was able to negotiate both sides of the deal, and because Enron was desperate to unload losses from their sheets, they would sell at a very bad price for Enron, and a great price for the hedge fund. Many of the investors in the hedge fund were employees of Enron, or bankers who wanted to do business with Enron (the CFO would give them preferential treatment). Check out book and or documentary \"smartest guys in the room\"" ]
[ 19 ]
[ [], [], [] ]
[ "url" ]
[ "url" ]
n21mu7
How those anti-counterfeiting stickers work?
Isn't it true that everyone can create those stickers? I mean like these [ URL_0 ]( URL_0 )
Technology
explainlikeimfive
[ "gwgpttt" ]
[ "These types of stickers is designed so that they are quite hard to make yourself. You can not just print them out on a printer but they need to be printed on a press with a very expensive type of die with specific microgroves in them to make the exact fine texture that gives it these effects when seen in different light conditions. So you either have to develop some sort of new technology or you need to spend hundreds of thousands of dollars on making such a die. However when you have that die you could print them out in the millions. This is why it is cheap for manufacturers to make these stickers but very expensive for forgers who only need to make a handful of them." ]
[ 10 ]
[ [] ]
[ "url" ]
[ "url" ]
9zeukv
Standard Deviations, Standard error of mean, Confidence intervals and P Value.
I have a really big exam at university in a few weeks, it's a Research Methods in Nursing exam. I am having real trouble getting my head around these statistics terms. I have searched the sub and looked at some answers but I still can't get a solid grip of them. It's probably worth mentioning I am dyslexic. Any help anyone can offer in really simply explaining these terms would be simply fantastic. I would be so grateful.
Mathematics
explainlikeimfive
[ "ea95s1z" ]
[ "Standard deviation (SD) - representation of how far away from the sample mean a score is. For example, sample meam of IQ is 100 and SD of 15. If I scored 1 SD above the mean, that means I have an IQ of 115. Confidence intervals (CI) - how sure are you that the score you received was an actual case and not just a false positive. Most are set at 95%. Which means, depending on the statistical test you are running, sets you're cut off for accepting or rejecting the null hypothesis. P. Value is just another way of saying the CI. P values are typically used in the results and the discussion. It allows the reader to interpret the results without writing it all out. So you have a CI of 95%, your p. value would be .05. It is saying there is a 5% chance you are wrong. Or that every 20th test you run will result in a false positive." ]
[ 3 ]
[ [] ]
[ "url" ]
[ "url" ]
evlbmw
How is a molecular clock calculated?
Its also called gene clock
Biology
explainlikeimfive
[ "ffwd0t9" ]
[ "To calibrate a molecular clock, you need something that's known and dated, like a fossil from the specific species in question. Then, once the rate of mutation is determined, you can calculate the divergence of species, although it's not always that easy, because mutation rates can fluctuate which leads to some degree of uncertainty. This can be minimized if you have more fossils from different time periods to look at, but that's not always possible." ]
[ 6 ]
[ [] ]
[ "url" ]
[ "url" ]
b1471c
How do large chains like Starbucks or Dunkin Donuts offer free drinks as rewards even if you never go to a specific location and redeem your free drink code there?
Other
explainlikeimfive
[ "eij5m98" ]
[ "The individual store records the fact that they gave out a free drink, and the corporation refunds them partially or fully. Often, individual stores are allowed to opt out of these promotions, hence the \"at participating locations\" disclaimer when they are advertised." ]
[ 4 ]
[ [] ]
[ "url" ]
[ "url" ]
632y1v
Why is red perceived as a color but wavelenghts inmediately below it are perceived as heat?
Why, if the distinction between red and infrared is only made by us humans, do those two wavelength ranges have so different properties? I mean, what's so different about infrared wavelengths that makes them related to heat, but not the inmediately higher frequencies like red?
Physics
explainlikeimfive
[ "dfqx2nm", "dfqwrsz" ]
[ "All the wavelenght have energy that you can feel as heat on your skin if it's powerful enough. There is two phenomenon that happen, which will explain how you perceive it. 1) Our eyes can detect a portion of light wavelenght. We call that visible light, but the wavelenght themselves have no special value except that our eye can see them. We can see red, but not infrared. 2) Everything with energy emit electromagnetic waves as radiation. That wavelenght that any object emit depend on it's temperature. Look at your oven heating element. It's glowing red because it reach a specific temperature so it radiate in dark red. A fire have a higher temperature so it radiate orange/red. A plasma torch have an even higher temperature and will look blue. Well the same thing happen with object colder. At room temperature object still have energy that they radiate, but they radiate in the infrared. That's why we think of infrared as the heat signature, because you can see the infrared that everyday object and people emits." ]
[ 5 ]
[ [], [] ]
[ "url" ]
[ "url" ]
6qo6oo
Why do animal products (i.e. cow's milk) spoil much faster than plant products (i.e. almond milk)?
Biology
explainlikeimfive
[ "dkyp58e" ]
[ "Evolution. Cow's milk is supposed to come straight out the udder and into the calf's mouth. There is no preservation needed besides sitting in the cow:s stomach for a few hours where there are things to help fight disease anyway although these die quickly and without replenishment the bacteria can spread easily. Plant products however, are either made in a factory, and so are made in a relatively sterile environment in terms with the law of the country. In which case the bacteria has to get into the milk and then start multiplying which takes time, especially when the lid is never opened. So the only bacteria is the tiny amount inside already, which takes ages to grow enough to become harmful. Milk made by plants for plants ie coconut milk is designed to last a long time. So the anything placed in the milk by the plant to fight bacteria also lasts along time, so it has the best chance of keeping long enough for the plant, or offspring or whatever, to use" ]
[ 5 ]
[ [] ]
[ "url" ]
[ "url" ]
5x49dd
Do people without Nielsen boxes affect viewership ratings? Does recording a show and watching it later increase viewership counts?
I'm trying to find out if there are other metrics other than Nielsen. Do they still use Nielsen boxes?
Technology
explainlikeimfive
[ "def4k7p", "def7cpu", "defeyts" ]
[ "They still use nielsen pretty much exclusively. And nielsen still relies almost entirely on set-top boxes. They have a competitor in rentrak which uses actual data provided by cable provider partners. nielsen recently [struck a deal with dish network]( URL_0 ) to do the same. Their numbers are garbage and that's no secret to anyone." ]
[ 34 ]
[ [ "https://www.wsj.com/articles/nielsen-to-include-set-top-box-data-in-ratings-for-first-time-1459764001" ], [], [] ]
[ "url" ]
[ "url" ]