q_id stringlengths 6 6 | title stringlengths 4 294 | selftext stringlengths 0 2.48k | category stringclasses 1
value | subreddit stringclasses 1
value | answers dict | title_urls listlengths 1 1 | selftext_urls listlengths 1 1 |
|---|---|---|---|---|---|---|---|
a8sdho | why do batteries have a smaller carbon footprint than fossil fuels? | Technology | explainlikeimfive | {
"a_id": [
"ecdap80",
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"text": [
"Because you can generate power from Hydro-electric, Solar, Geothermal, Wind, Tidal, and Nuclear power and use that electricity to recharge the battery. Even with coal or diesel powerplants the power generated in them is much more efficient and therefore c... | [
"url"
] | [
"url"
] | |
a8uqov | Why hasn't anybody created a new "YouTube" | Technology | explainlikeimfive | {
"a_id": [
"ecdwc9k",
"ecdwjyr",
"ecdwdt4"
],
"text": [
"There are plenty of video streaming services - Vimeo, Streamable, Dailymotion. YouTube is simply more popular.",
"Vimeo..but its more professional artsy videos on that site..the community is not as toxic as youtube..also its more qualit... | [
"url"
] | [
"url"
] | |
a8v4yt | Why do many web pages seem to first load once, then disappear / realign and take another couple of seconds before they are actually done? | Technology | explainlikeimfive | {
"a_id": [
"ecedlx8",
"ecetlvu",
"ece4l3g",
"ece4rui"
],
"text": [
"Bad website design. This is something that people making websites should know about, and that is relatively easy to make not happen. But many website designers choose not to care about it when they're making websites, so they... | [
"url"
] | [
"url"
] | |
a8xfe7 | Why does AM radio sound like crap compared to FM? | Technology | explainlikeimfive | {
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"eceyv3k",
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"text": [
"I've seen it explained like this in the past: Radio waves are just light that you can't see. Imagine you can see this light now all of a sudden. FM gives your radio receiver information by changi... | [
"url"
] | [
"url"
] | |
a8xisc | Why is it that live TV doesn't buffer as an internet stream does? | Technology | explainlikeimfive | {
"a_id": [
"ecer2q7",
"eceve3z"
],
"text": [
"* Live TV via broadcast or cable network is sent directly to you via a dedicated system that only exists to send the audio and video to you. * The internet sends all kinds of data via a web of different companies and locations. Each stream of data is brok... | [
"url"
] | [
"url"
] | |
a8xza3 | How do live football field graphics appear beneath the players? | You know when it shows the scrimmage lines or whatever right on the field? I assume the graphics are already using pan/tilt/zoom data from the cameras, since it looks a lot stabler than simply motion tracking (please correct me if I'm wrong on that), but what really baffles me is how the graphics appear "beneath" the p... | Technology | explainlikeimfive | {
"a_id": [
"ecetmuv",
"eceytfi"
],
"text": [
"You had the right idea already. It is indeed chroma key. The cameras are simply good enough that they can distinguish between the green of the grass and the green in uniforms. They actually need to continually reset the chroma key as the color of the gras... | [
"url"
] | [
"url"
] |
a8z2q4 | What is the difference between re-chargeable batteries and standard ones, that allows for the former to be recharged? | Title | Technology | explainlikeimfive | {
"a_id": [
"ecf55hq"
],
"text": [
"All batteries use a chemical reaction to create the negative-to-positive electron current that powers our world. The chemical reaction that gives a standard, alkaline battery is irreversible, so once they are done they are done. Rechargable batteries use an electrical c... | [
"url"
] | [
"url"
] |
a90lrv | - How is music pressed into a vinyl disc and then replayed with a needle? | Technology | explainlikeimfive | {
"a_id": [
"ecfl67u"
],
"text": [
"First let's start with recording. A band would gather in a studio and play a song, and there would be a receiver of some sort that captures the sound. So imagine something like the horn on an old phonograph, and inside there is something that vibrates when sound hits it... | [
"url"
] | [
"url"
] | |
a91ndx | why aren’t commercial cargo shipping vessels using nuclear power? The little I’ve read says because of cost but if they have such a long life won’t the eventually pay for themselves? | With the recent talks of shipping lanes opening in the arctic and some Arctic’s icebreakers already using nuclear power, wouldn’t it be smart to only allow/ pusher for greener options to use these possible shipping lanes. Would it reduce greenhouse gases? | Technology | explainlikeimfive | {
"a_id": [
"ecfryac"
],
"text": [
"In that regard it's not a bad idea in my opinion, but there are more costs than just building the reactors, you also have to pay to train the operators and then pay them to operate. And trust me when I say that learning all that stuff is not an easy job. So I'd say at t... | [
"url"
] | [
"url"
] |
a9232t | Why do some state government healthcare websites shut down every night "for scheduled maintenance" - what maintenance are they doing for 8 hours every single night that prevents users from logging on to see their account? | Technology | explainlikeimfive | {
"a_id": [
"ecfveu3",
"ecfwk33"
],
"text": [
"Could be database backups that they don't want new data being written into while copying over to the backup files because that can lead to issues.",
"If the system is connected to their mainframe, it would be due to the fact that the mainframe goes of... | [
"url"
] | [
"url"
] | |
a953i7 | During the film editing process, how does a camera know exactly what is behind someone wearing a green morph suit? | Technology | explainlikeimfive | {
"a_id": [
"ecgg9wi",
"ecgypb4",
"ecgfz93"
],
"text": [
"Usually a shot called a \"plate shot\" is used. Sometimes it's as simple as removing all the actors, and filming the background for a second or two. This gives the visual effect company enough information to remove any green and replace tha... | [
"url"
] | [
"url"
] | |
a95ge0 | How does machine learning work? And why are people saying its dangerous? | Technology | explainlikeimfive | {
"a_id": [
"ecglxov",
"ecgm2mt",
"ecgitex"
],
"text": [
"Facebook can tell whether you're gay based on a few 'likes,' study says URL_0 Now suppose you live in a country where being gay is against the law.",
"Machine learning takes a bunch of random inputs: height, weight, income, education, r... | [
"url"
] | [
"url"
] | |
a96bwk | How did they manage to land people on the Moon and return to Earth with computers that were not even as powerful as mobile phones? | Technology | explainlikeimfive | {
"a_id": [
"ecgp8gb",
"ecgq0ff"
],
"text": [
"The trajectories were all calculated beforehand. There are still plenty of variables in space, but wind speed, weather, etc don’t apply like they do for aircraft. It really comes down to geometry, which can be done without much processing power.",
"> ... | [
"url"
] | [
"url"
] | |
a977dd | why is there a need for both "ip" and "mac" addressees to exist? | edit: thanks for the help guys | Technology | explainlikeimfive | {
"a_id": [
"ecgwz8v",
"ecgwhgk",
"ech3186",
"ech22f5"
],
"text": [
"Mac is who you are. IP is where you are. It’s same reason you have both a social security number and an address.",
"My very basic understanding is that MAC is like a devices serial number. Where IP can be reassigned. It's... | [
"url"
] | [
"url"
] |
a99q9n | Why do modern ultra-high-def TVs make some high-quality productions look like home video? | I’ve been noticing this for a while. When watching movies or shows on modern HD TVs, the production quality suddenly feels cheap. Top productions have the feel of high-quality home video or Asian soap opera. What would cause this? | Technology | explainlikeimfive | {
"a_id": [
"echjrij",
"echpd5f",
"echm24k"
],
"text": [
"The colloquial term is 'the Soap Opera effect'. Higher end TVs basically insert fake frames to reduce motion blur, causing 24fps video to look like 30/60fps. It causes that weird smooth look. If you wanna do further research, lookup MC/ME (... | [
"url"
] | [
"url"
] |
a9b2eg | how do computers know how to do math? | I understand someone programs it but how do you teach a piece of software to do math? | Technology | explainlikeimfive | {
"a_id": [
"echxbrh",
"echvsxy",
"echw7uq"
],
"text": [
"Logic gates. Basically you set up a series of switches that depending on an input will have one output. The basic logic gates are AND, OR, XOR, and NOT. They are all in binary and with the exception of NOT take two inputs. An AND gate outpu... | [
"url"
] | [
"url"
] |
a9bf6g | What defines a font? I.e., can one deduce what X, Y & Z look like based off of A-V? | Technology | explainlikeimfive | {
"a_id": [
"echyq7t"
],
"text": [
"A font is a uniform form of letter. It is based on calligraphy, an art form. The only thing that makes a font look a specific way is they look alike and since it's based on stylising something you can guess but there isn't a formula, just as there is not a set formula f... | [
"url"
] | [
"url"
] | |
a9bymq | How do lights change colors? | Technology | explainlikeimfive | {
"a_id": [
"eci3bzi",
"eci3jgw"
],
"text": [
"Lights that change collors will actually have three small lights inside them which can turn on at various brightness. The lights inside will be a red, green, and blue. These will turn on at various brightnesses to cause different colors to appear. Red and... | [
"url"
] | [
"url"
] | |
a9bzep | 5: how or why do wireless devices catch viruses? | Technology | explainlikeimfive | {
"a_id": [
"eci3i57",
"eci3pxv"
],
"text": [
"The same way that conventional electronic devices do, wireless is just another way of connecting to the internet it doesn't provide any protection against viruses if anything because a wireless network is easier to hack you are more vulnerable.",
"Wir... | [
"url"
] | [
"url"
] | |
a9d3id | how 60fps works on a 144Hz monitor | According to quick calculations in my head, for a 144Hz monitor to display 60 fps, each frame would have to run for 2.4 "cycles" of the monitor, which to my understanding wouldn't be possible (only changes on whole digit "cycles", 144 of which happen per second) Do I have some kind of fundamental misunderstanding of th... | Technology | explainlikeimfive | {
"a_id": [
"ecibx99",
"ecic110"
],
"text": [
"They are unrelated. The screen is always technically flickering at 144hz no matter what the FPS is. The FPS is from your computer only",
"The fps is the limiting factor. If the GPU pushes a new image 60 times per second, but the monitor is refreshing ... | [
"url"
] | [
"url"
] |
a9d8ed | Why did the ".us" domain never catch on compared to other countries' domains? | Technology | explainlikeimfive | {
"a_id": [
"ecidfta",
"ecicyxd",
"ecixvhk"
],
"text": [
"The Internet was invented by the US as a joint project with universities and the US military, and while the World Wide Web (www.) address system was developed in the UK most of the early sites cataloged in the system were based in the US. T... | [
"url"
] | [
"url"
] | |
a9dmrd | Why does a device retain it's setting if the batteries are replaced quickly? | I have an older digital camera. If I swap the batteries in a few seconds the clock and other settings remain. Why? | Technology | explainlikeimfive | {
"a_id": [
"ecifr5o"
],
"text": [
"This can be any one of several different reasons: 1) If you lose those settings if you take more than 15 seconds to switch, most likely there's charge left in capacitors distributed throughout the camera and it's this charge that's used to keep the clock ticking for a f... | [
"url"
] | [
"url"
] |
a9f80s | Why aren't decentralized "Internets" popular? | Technology | explainlikeimfive | {
"a_id": [
"ecisk7h"
],
"text": [
"They have a lot of problems. For example you would need some path to whatever physical server you want to reach and that generally means you would need an unbroken chain of WiFi routers. That simply doesn't exist in most cases; perhaps within a dense city but there is a... | [
"url"
] | [
"url"
] | |
a9g16p | Why does auto correct often change what you're actually trying to say, but when you make simple mistakes, like 'tge' instead of 'the', it often doesn't fix it? | Technology | explainlikeimfive | {
"a_id": [
"eciyme2",
"ecj4mli",
"ecjv1sk"
],
"text": [
"Most auto correct features \"learn\". Because small fuckups on everyday words happen quite often, after a while the auto correct assumes that is how you want to spell it, because it may be a slang or dialect word, the program doesn't know. ... | [
"url"
] | [
"url"
] | |
a9i2ci | How does a Turbofan differ from a Turbojet? | I’ve heard that Turbofans are much more efficient, and powerful compared to a turbojet which is why airliners use them, if this is true, why does something like an F-18 or even the F-35 use a turbojet? | Technology | explainlikeimfive | {
"a_id": [
"eck0k4e"
],
"text": [
"Let's clear up some confusion: F/A-18s, F-35s, F-22s, F-15s, etc all use turbofan engines. Turbojet engines haven't been used in fighters for quite some time because they're less efficient. Turbofans are essentially turbojets that are placed into yet another tube, with ... | [
"url"
] | [
"url"
] |
a9k2ux | What exactly is Discogs for/how does it work? | Technology | explainlikeimfive | {
"a_id": [
"ecke6os"
],
"text": [
"It’s a database that allows users to archive all the recorded music of a particular artist in detail. Their discography. It’s an excellent reference site for music nerds. Users obsess over how many test pressings a record had, or find out how many red Van Halen Diver Do... | [
"url"
] | [
"url"
] | |
a9k9r8 | How does the sound of your phone transfer through headphones? | Technology | explainlikeimfive | {
"a_id": [
"eck4pss"
],
"text": [
"The headphones contain speakers like the phone does, a flexible diaphragm which is caused to vibrate with an electromagnet to make the air vibrate. The wire connecting them to the phone conveys the electricity to actuate the electromagnet."
],
"score": [
19
],... | [
"url"
] | [
"url"
] | |
a9knzm | Why is it that we are unable to take good photos of the moon using a cellphone camera? | Technology | explainlikeimfive | {
"a_id": [
"eck8hoy"
],
"text": [
"It's exposing for an average of the frame, which is very dark, so the moon which is bright overexposes to white. If you have an exposure slider you can drop it way negative and potentially expose for the moon correctly. Or get a zoom so you can make the moon more than 5... | [
"url"
] | [
"url"
] | |
a9p4d7 | How data packets work? | Technology | explainlikeimfive | {
"a_id": [
"ecl72n6",
"ecl7xa0"
],
"text": [
"A packet is just the general name for a chunk of data, how it's configured is different for each protocol For communication over Ethernet it works a lot like an IRL letter where there's a header that says who it's from and where it's going. If you want to... | [
"url"
] | [
"url"
] | |
a9pc90 | How do active noise cancelling headphones work? | As in the headphones with mics in them that supposedly counteract the outside noise depending on what it is? I mean they can't just play silence? I'm so confused... | Technology | explainlikeimfive | {
"a_id": [
"ecl8k2n"
],
"text": [
"A micro phone picks up the average ( selected range) sound and produces the opposite sound (one sound wave cancelling out the other) in the ear thereby cancelling the two out. (Edit for thick thumbs)"
],
"score": [
16
],
"text_urls": [
[]
]
} | [
"url"
] | [
"url"
] |
a9pxti | Difference between Excel Add-in and COM Add-in? | There's an Add-in category dropdown in Excel. There are other options, but I'm interested in Excel Add-in and COM Add-in. Aren't they both Excel add-ins? | Technology | explainlikeimfive | {
"a_id": [
"eclg9qm"
],
"text": [
"They are both Add-Ins, but the integration/development method is different. Microsoft evolved the add-in and extension frameworks over time. COM (Common Object Model) was notoriously difficult to work with and an unstable COM add-in could crash the whole application. Th... | [
"url"
] | [
"url"
] |
a9r14p | How do phone/computer chargers work? | Technology | explainlikeimfive | {
"a_id": [
"eclnz6c",
"eclqqco"
],
"text": [
"Without more explanation of what you want to understand I'll explain very simply. Your phone and computer have batteries that need to be charged. They need direct current input at a specific voltage. The charger takes the alternating current coming out of... | [
"url"
] | [
"url"
] | |
a9ru2d | How does Bluetooth work? | We see and use Bluetooth on our devices all the time. We all know that if we press the device we want to connect to on the Bluetooth page from our devices we can hear or watch whatever we want on different devices, but I can not even begin to understand how it works. | Technology | explainlikeimfive | {
"a_id": [
"eclv2lc"
],
"text": [
"How deep of an explanation do you want? At its core, Bluetooth is similar to any other wireless data communication standard like wifi or cellular data. It sends data encoded into a radio wave in the 2.4 Ghz range. Bluetooth has multiple profiles that allows it to send a... | [
"url"
] | [
"url"
] |
a9tw5f | When movies were projected on screen with film, the screen was black 50% of the time and our brains filled in the gaps to create motion. Do modern digital projectors work in the same way? Or how is the magic achieved? | Technology | explainlikeimfive | {
"a_id": [
"ecmhycm",
"ecmwp29",
"ecmfn7c"
],
"text": [
"Old fashioned film projectors used a flashing light or a blinking shutter to briefly project a still image onto a screen, then blanks the screen to enable the film to rotate to the new image. Modern screens use solid-state electronics, whic... | [
"url"
] | [
"url"
] | |
a9ubfp | SSH certificates | I work in the web dev industry but rarely use them so don’t have a good understanding when they’re brought up in tutorials or conversation. Could any ELI5 SSH certificates and how they work for the web world? | Technology | explainlikeimfive | {
"a_id": [
"ecmjltc",
"ecn1o9l"
],
"text": [
"A certificate is used to verify that you are who you claim to be. Basically like a password, but a certificate is more like a big document that is too big to remember. Certificates can be handy for SSH as an alternative to passwords because * Passwords ar... | [
"url"
] | [
"url"
] |
a9uid3 | do planes actually have to request 'permission' to land at airports even when they have flight plans? | Technology | explainlikeimfive | {
"a_id": [
"ecmkd3h",
"ecml16v",
"ecmnbyo",
"ecmld40",
"ecmknq8"
],
"text": [
"Busy airports schedule their flights to the minute, and a flight plan is not anywhere near that specific. If you want to land at a controlled airport you need to announce your intentions and await permission. F... | [
"url"
] | [
"url"
] | |
a9v961 | Why do nearby WIFI networks appear above mine, even though I am next to my router? | Technology | explainlikeimfive | {
"a_id": [
"ecms3dv",
"ecmym1x",
"ecn2zai"
],
"text": [
"Depends on the fliter in the OS. Could be due to name, WiFi security type, strength of the connection, GHz band etc.",
"Being right next to the router can sometimes result in a worse signal because of the way radio waves travel away fro... | [
"url"
] | [
"url"
] | |
a9vriu | C$ network share | I know this is a hidden share, but what's the point of it? Is C$ a duplication of the C: drive (meaning is it using the same amount of space as C:), and why does it exist? Surely administrators can see the regular C drive anyway? | Technology | explainlikeimfive | {
"a_id": [
"ecmxule"
],
"text": [
"C$ is your C: drive. It's not a duplicate of your C: drive, it's the same thing. Administrators can't see the C: drive from a different computer."
],
"score": [
6
],
"text_urls": [
[]
]
} | [
"url"
] | [
"url"
] |
a9wbyo | Difference between Cat5 and Cat5e lan cables? How does this entire LAN tech work? | Technology | explainlikeimfive | {
"a_id": [
"ecn0ypl"
],
"text": [
"It’s just a huge, broad question. There are four year degree programs about this (Computer Network Engineering). As for the cables, simply put the difference between cat5 and cat5e is that e is faster. This is because of the way the cables are twisted, essentially. They... | [
"url"
] | [
"url"
] | |
a9wme8 | Why can TV antenna's reception be improved by adding a dish around it but the same won’t work for WiFi antennas and cellphone antennas? | Technology | explainlikeimfive | {
"a_id": [
"ecn2kz6",
"ecn36e2",
"ecn2s2o"
],
"text": [
"Your premise is false. It *does* work for these other antennas, as long as you know the direction of the device you are communicating with.",
"We use them for point to point where both units stay in the same place. If you don't mind hav... | [
"url"
] | [
"url"
] | |
a9xalj | How is video manipulation done? | I understand one could painstakingly manipulate photos to add, remove or move objects, change the color, etc. But isn't it crazy to do the same for video, since it would need to be done for thousands of frames? Maybe with modern Machine Learning techniques it got easier, but isn't that still in experimental stages? & #... | Technology | explainlikeimfive | {
"a_id": [
"ecn7x2e",
"ecnqe3k",
"ecn8re0"
],
"text": [
"One way is to track motion in the video and add the effect/object to that \"stationary\" (relative to the in-footage object) point. We did a post effects project in my uni where we replaced a wound on the actor with a 3D model because the m... | [
"url"
] | [
"url"
] |
aa0dob | How do game anti cheats, like BattlEye or GameGuard work? | What I mean is - I know they can check the processes which are running and are associated to the game that you're playing, but how do they know that those processes are actually cheating tools? | Technology | explainlikeimfive | {
"a_id": [
"eco0g43",
"eco0k0f"
],
"text": [
"There are different flags that can be detected to assume someone is trying to tamper the game, such as debugging another process (the game in this case), accessing the memory mapped to that game, running the game in a virtualized environment, tampering th... | [
"url"
] | [
"url"
] |
aa0sei | Why do people that repair phone screens need your passcode to your phone? | Technology | explainlikeimfive | {
"a_id": [
"eco2chw",
"eco27fm",
"eco2r6t"
],
"text": [
"Every phone has a test mode where you can test every corner of the screen and be sure everything works. Without passcode you cannot get to that mode.",
"I think maybe they need to make sure your finger movements work properly and the se... | [
"url"
] | [
"url"
] | |
aa12y9 | in a world of account lockout thresholds, do brute force attacks still work? | Technology | explainlikeimfive | {
"a_id": [
"eco510p"
],
"text": [
"So you're assuming your account lockout is on the account rather than an IP block. Most brute force systems will block the IP address trying to attack (because locking the account means the genuine user can no longer gain access). A few points: 1) if account lockout is ... | [
"url"
] | [
"url"
] | |
aa2fm1 | Why is there internet download and upload limits. | Technology | explainlikeimfive | {
"a_id": [
"ecof0sd"
],
"text": [
"Partly to help keep bandwidth available for other people to use; but mostly just because they can make money out of you that way."
],
"score": [
10
],
"text_urls": [
[]
]
} | [
"url"
] | [
"url"
] | |
aa31o0 | In the Apollo 13 mission, how did the command module become freezing in the return trip from the moon? | So in the Apollo 13 movie, when returning from the moon, the crew has to turn off all of their equipment in order to conserve energy for the reentry, due to a lot of their fuel being vented. Now I'm not sure if this is just creative license in the movie to create more suspense, but my cursory knowledge of this is that ... | Technology | explainlikeimfive | {
"a_id": [
"ecokrax"
],
"text": [
"It's absolutely true that the command module reached temperatures not much above freezing after the equipment was shut off. You're correct that it's hard to radiate heat in space, but on the same hand, it's hard to absorb heat radiated from the sun (radiation is the onl... | [
"url"
] | [
"url"
] |
aa3lvq | How can data (files and photos) be recovered from a damaged or deleted hard drive? | Technology | explainlikeimfive | {
"a_id": [
"ecor9o7"
],
"text": [
"Most often, \"deleted\" data isn't actually gone. The computer simply removes its reference to it -- like scratching out a chapter in the Table of Contents without actually tearing those pages from the book. Similarly, when new data is written over old data, it may not ... | [
"url"
] | [
"url"
] | |
aa45sz | How do those movie theatre vacuums work? The ones that don’t plug in and you just run it over the carpet? | Technology | explainlikeimfive | {
"a_id": [
"ecou9po"
],
"text": [
"Wheels turn a drum with brushes, that moves trash into the body of the unit. No suction, just human powered rotating brushes."
],
"score": [
10
],
"text_urls": [
[]
]
} | [
"url"
] | [
"url"
] | |
aa7l7n | How does a relatively small transformer fire light up almost an entire city? Also, why is it blue? | Technology | explainlikeimfive | {
"a_id": [
"ecpod3u",
"ecqhdd6"
],
"text": [
"Even a relatively small transformer draws a massive amount of power. The power supply is high voltage AC, which is arcing in the open air. Basically, the open air is acting as a fluorescent bulb. It's mostly light from nitrogen, which glows blue, like neo... | [
"url"
] | [
"url"
] | |
aa7ofu | How can videos capture the physical movement of waves passing through guitar strings, when they just look like they are moving back and forth rapidly to the naked eye? | An example of this would be like in this video URL_0 | Technology | explainlikeimfive | {
"a_id": [
"ecpopam"
],
"text": [
"Rolling shutter. Image sensors in cameras don't take the entire imagine at one single time, they scan it up and down/side to side. So it is basically capturing the strings in different places for the same frame. Here's a video. [ URL_0 ]( URL_0 )"
],
"score": [
... | [
"url"
] | [
"url"
] |
aa8e4x | How do google "index of" websites work? | I know that you can find some interesting stuff(eg. movies, games, software) by adding "indexof" to your google query. I want to know why and how this works and why the websites cannot be found by normal search. I also tried to do a traceroute, ping and whois search but the sites seem to be non existant. How are they a... | Technology | explainlikeimfive | {
"a_id": [
"ecpwu30"
],
"text": [
"The \"index of\" is a feature of the webserver, that is delivering the website. Normally you tell your webserver which file of a directory is the index, or rather which file to deliver by default (i.e. index.html). If the webserver does not find that file it might creat... | [
"url"
] | [
"url"
] |
aa8nvd | Why is a camera not able to take a proper picture of a monitor or TV screen? | Technology | explainlikeimfive | {
"a_id": [
"ecpwer4",
"ecpvvrt"
],
"text": [
"Are you talking about the wavy lines? They're called [moiré patterns]( URL_0 ). Nothing to do with the refreshing of the screen. It's an interference pattern due to the difference between the grid of pixels on the screen, grid of the camera sensor, and pi... | [
"url"
] | [
"url"
] | |
aa9li2 | How do computer drivers work? Why do some accessories need them and some don't? | Technology | explainlikeimfive | {
"a_id": [
"ecq1esn"
],
"text": [
"Basically, a driver is a program (software) that tells the computer how to use the hardware. When you press a key on a keyboard, move or click your mouse, or anything of that nature, the computer needs to have a program to tell it what those signals should make it do. I... | [
"url"
] | [
"url"
] | |
aac6l1 | How could improper connection of 3.5mm jack could sometimes fully isolate the music in some content? | I've been watching a show with my headphones connected to the PC and something happened that I recall to have happen more than once before, the voices of the people are cut out and the music plays like nothing is wrong. How could it isolate it so perfectly like that from just an improper connection? | Technology | explainlikeimfive | {
"a_id": [
"ecqrvbp",
"ecqpc9e"
],
"text": [
"Former audio equipment service guy here. 3.5mm jack is built that way that, if you don’t plug it in fully - it doesn’t connect all 3 wires (L, R, and mutual ground); without ground, both headphone sides plays the same - just the difference between left an... | [
"url"
] | [
"url"
] |
aacmq5 | How are 3D movies made? Are the movies also edited wearing 3D glasses? | Technology | explainlikeimfive | {
"a_id": [
"ecqtnc2",
"ecr17rw"
],
"text": [
"There are 3d cameras that have 2 lenses that allow for the 3d effect. I can't speak about editing though.",
"What you refer to is called stereoscopic vision which requires a movie to be shot on two different films in order to take the differing perspe... | [
"url"
] | [
"url"
] | |
aafurh | Why when stored vertically vinyl records do not warp but when stored laying flat (horizontal) they can warp? | Seems like it should be the opposite | Technology | explainlikeimfive | {
"a_id": [
"ecrop58"
],
"text": [
"You can store them horizontally, you can even store two of them on top of each other, but keep in mind: The more you put on top of each other, the more weight will be on the bottom ones. The edges of the cover and sheet are twisted back and glued, which means that the p... | [
"url"
] | [
"url"
] |
aagoil | What is a long exposure photo and how are they taken? | I have seen a lot of "long exposure" photos in reddit and I can't seem to understand what are they exactly and how do they work, any help? | Technology | explainlikeimfive | {
"a_id": [
"ecrv7jh"
],
"text": [
"To take a picture, we control for 3 variables - aperture, exposure time and ISO. ISO is the sensitivity of the sensor. Higher the sensitivity, higher the noise. Increase ISO only if the light is low and subject is moving. Aperture is how wide the lens is open. Larger th... | [
"url"
] | [
"url"
] |
aagt4p | How does the live traffic feature on Google Maps work? | Technology | explainlikeimfive | {
"a_id": [
"ecrxs8i",
"ecrxm8t"
],
"text": [
"URL_0 It collects data from smartphones with location turned on, and if notices a lot of users seem to move slowly on a certain road, it'll know that there is a traffic congestion there.",
"They gather real time data from people who have their phone t... | [
"url"
] | [
"url"
] | |
aagyft | What exactly does "Airplane mode" do and how does it keep my phone from disrupting airplane functions? | Technology | explainlikeimfive | {
"a_id": [
"ecrxzd9",
"ecs05o2",
"ecsatga",
"ecrya80",
"ecsj486"
],
"text": [
"It disables the cellular transceiver in your phone. It just turns off the part of your phone that sends and receives data from cell towers. The idea is that you will not be creating electromagnetic interference... | [
"url"
] | [
"url"
] | |
aahnmb | How does a computer keep track of the time even when its off? | Technology | explainlikeimfive | {
"a_id": [
"ecs3bjw",
"ecs3i8q"
],
"text": [
"There is a real clock in the computer that keeps track of date and time even when the computer is powered off. All computer mother boards have CMOS battery installed that keeps this real clock running. The battery doesn't last forever but from my experien... | [
"url"
] | [
"url"
] | |
aahuhx | How do interactive movies (like Bandersnatch) work, technologically-speaking? | Technology | explainlikeimfive | {
"a_id": [
"ecs55qq"
],
"text": [
"I haven't watched it yet, so no spoilers please, but Basically it has to do with utilising Netflix's metadata parser. You may be familiar with how you can click a button to skip the intro of a show, or to immediately go from the credits of one ep to the start of the nex... | [
"url"
] | [
"url"
] | |
aai7mu | Why do holy books (the Bible, Book of Mormon, etc.) tend to use similar thin paper? | Technology | explainlikeimfive | {
"a_id": [
"ecs850g",
"ecsh6lq"
],
"text": [
"The special type of paper is called \"scritta paper,\" and it is used in books that have a large number of pages to reduce the thickness and weight.",
"A big part of it is cost - you can get a 1200 page hardcover for 12$, and a softcover for 3$ (or fr... | [
"url"
] | [
"url"
] | |
aal3g3 | Why does a weapon scope aims precisely to where the bullet is going to hit if it is standing above the barrel? | Technology | explainlikeimfive | {
"a_id": [
"ecsu12n",
"ecsu28e",
"ecsu4n1",
"ecsumy2"
],
"text": [
"I mean, it has to be calibrated to a certain distance. Its not like video games where ya just pop it on and its accurate",
"Well first of all you have to calibrate the scope. You still have to adjust for distance, wind et... | [
"url"
] | [
"url"
] | |
aal91x | How a PS2 game will be incompatible with the Xbox even if both games are written in C++ | Just something I'm wondering about. I have an engine that makes games with C++, but there are compile/export options to make the game a game for the Nintendo Switch, PS4, PC or Xbox One. What exactly do these options do? For example why can the same PS2 game be ported to the Xbox but if you put the Xbox disk into the P... | Technology | explainlikeimfive | {
"a_id": [
"ecsvpxh",
"ecsv6tc"
],
"text": [
"C++ is a \"high level\" language. The CPU doesn't directly understand C++, it has to be converted into machine code. That's what the compiler does. The PS2 and the Xbox use different machine code. They \"speak different languages\" in a sense. Some C++ co... | [
"url"
] | [
"url"
] |
aal9yk | How are console games developed for a system when they take longer than that system’s lifecycle? | I read an article that the game Cyberpunk 2077 has been in development for the past 8 years. Say a game that’s in development spans a console, do the developers need to refactor code and assets to work on the new platform? | Technology | explainlikeimfive | {
"a_id": [
"ecsvpok",
"ectcqxr"
],
"text": [
"In short: Yes. Nowadays assets are often made in very high quality (because it's easier to work with) and then downgraded to fit into the game. Porting a game to a new console can be very little work, assuming the architecture isn't too different from oth... | [
"url"
] | [
"url"
] |
aalkxm | In old cartridge console games, why would an image be frozen onto the screen if the cartridge was removed during play? | I can remember as a kid that if you were playing an N64 or Genesis and, while the game was running, removed the cartridge without turning off the console, the game's present image would be frozen onto the tv screen. How does this happen? | Technology | explainlikeimfive | {
"a_id": [
"ecsyyv6",
"ectsewy"
],
"text": [
"The graphics processor (if you will) would await commands from the central processor that would be awaiting responses from the cartridge based on the parameters in the rom file. If the cartridge was all the sudden gone, the processor would move into a hol... | [
"url"
] | [
"url"
] |
aamfk7 | With the popularity of high powered telescopes, can't moon landing deniers be easily proven wrong by seeing leftovers from the landings? | Basically the title... With the popularity of high powered telescopes, aren't there enough consumer grade telescopes available to see all the leftover stuff on the moon from all the landings and wouldn't this easily disprove all moon-landing deniers? Or am I underestimating how hard that would be to see | Technology | explainlikeimfive | {
"a_id": [
"ectdxc6",
"ect5a2f",
"ect5iar",
"ecth4wa"
],
"text": [
"Moon landing deniers aren't interested in seeing proof. There is ample proof available already, and there has been for decades. Anyone actually curious about it could find definitive proof quite quickly. New proof is irreleva... | [
"url"
] | [
"url"
] |
aamq9z | why does restarting seem to solve so many computer problems? | Heck, it solves many other problems with electronics too from a faulty bulb to a WiFi router. | Technology | explainlikeimfive | {
"a_id": [
"ect7jz0",
"ecu1cfj",
"ectehyn"
],
"text": [
"It clears the RAM and reloads all of the drivers. So if theres anything that is stuck or had a driver failure it fixed the immediate problem. The problem may still exist but its been put back to square 1.",
"Have you ever read a Choose ... | [
"url"
] | [
"url"
] |
aan6r0 | Why are most file extensions 3 letters long? | Technology | explainlikeimfive | {
"a_id": [
"ectb8gz",
"ectbasd",
"ectbyny"
],
"text": [
"Many years ago when memory was an issue and the name of a file could actually be important for your computers allocation of memory, ~~windows microsoft operating systems~~ older operating systems used a so-called [8.3 filename system]( URL_... | [
"url"
] | [
"url"
] | |
aan6vf | why is the sound quality of a song so much better when it’s played during a movie vs just listening to the song regularly? | Technology | explainlikeimfive | {
"a_id": [
"ectbnp9",
"ectbazp"
],
"text": [
"I have not experienced this. Maybe it is something subjective to yourself? I listen to music on the same HiFi system that I use for movies. Both sound equally great. Can you provide a specific example of a song in a movie? I'll stream the movie then play ... | [
"url"
] | [
"url"
] | |
aap1iu | Why is styrofoam still used? | I just removed a piece of exercise equipment purchased from Costco. It was packed in molded styrofoam. I'm super careful that I don't litter anything, but styrofoam makes that nearly impossible. Tons of little foam beads break off and blow away, stick to anything with static, and are very difficult to clean up, yet we ... | Technology | explainlikeimfive | {
"a_id": [
"ectqvjh",
"ectr0mj",
"ecu3zsh",
"ectr31d"
],
"text": [
"It's cheap, effective, and for the most part completely legal. As long as those three factors are still true companies will very likely continue to use it. If another, cheaper, more effective option presents itself or styrofo... | [
"url"
] | [
"url"
] |
aap44j | How do you judge lenses for cameras? | I've been looking at lenses for my camera, but there are so many terms to watch out for. I've come to understand the 14-80mm thing and how that works for zooming, but once you have e.g. two 14-80mm lenses, what else do you consider? | Technology | explainlikeimfive | {
"a_id": [
"ectwdh4"
],
"text": [
"First of all, the aperture. f/2.8 has a shallower depth of field and can capture more light than f/5.6 Then you should consider optical defects, like chromatic aberration, geometric distortion, vignetting and propensity to flare. You should also consider the resolving p... | [
"url"
] | [
"url"
] |
aaq1dk | How does the electronic ignition in a lighter with no batreries work? | Technology | explainlikeimfive | {
"a_id": [
"ecu0ftb"
],
"text": [
"There are certain crystals that generate electricity when squeezed or bent. It's called piezoelectricity. The crystal has two electrodes either side to collect the electricity when the button is pressed, one is connected to the has jet nozzle nd the other to a metal rod... | [
"url"
] | [
"url"
] | |
aaq57x | What cores, threads and other related terms are when talking about game performance | I recently updated my Stellaris game and the game has slowed down a lot. Apparently this is something to do with cores and threads, but I can never follow the conversation. Could someone please explain? | Technology | explainlikeimfive | {
"a_id": [
"ecu1j7y"
],
"text": [
"Up until the mid-2000's the most common CPUs could only do one thing at a time. It could only be doing work on one set of calculations. It had the ability to pause its work, set aside one set of calculations and work on another set but the first set would be waiting on ... | [
"url"
] | [
"url"
] |
aaqepu | What's the function of a Screensaver | Technology | explainlikeimfive | {
"a_id": [
"ecu364m",
"ecu40of"
],
"text": [
"Back in the day when people had cathode ray tube monitors, if you left a static image on your screen for too long it would \"burn in\" and permanently discolor the screen. So people invented software called \"screen savers\" that after a certain period of... | [
"url"
] | [
"url"
] | |
aaqf9f | How did daguerreotypes work? What was the process? | Technology | explainlikeimfive | {
"a_id": [
"ecu4of3"
],
"text": [
"For that type of early photography you take a dark baseplate coated in silver and expose it to fumes from typically iodine or chlorine. This changes the pure silver to a compound that is sensitive to light. The places where the light hits are turned back into silver by ... | [
"url"
] | [
"url"
] | |
aaqu7a | why do digital clocks, like the ones on your stove or car, always lose time and fall behind, but never gain time and speed up? What mechanism controls their “time-keeping”? | Technology | explainlikeimfive | {
"a_id": [
"ecu7c6f",
"ecuu7hl"
],
"text": [
"the clock in my car actually runs fast, i have to set it back every couple months or so because i start calculating if ill be late to work or not by subtracting five minutes",
"The clocks of the type you're describing are typically quartz movements. B... | [
"url"
] | [
"url"
] | |
aasckm | What is, and how do, torrents work. | Technology | explainlikeimfive | {
"a_id": [
"ecuki55"
],
"text": [
"Imagine that a \"regular download\" is like you copying a book from start to finish in exact order. you can speed up your download by writing faster may be getting a better pen or reading faster At the end of the day you will still be limited by the system that you are ... | [
"url"
] | [
"url"
] | |
aasoxb | Why did televisions go from squares to rectangles? Is there an actual reason for the shape change or is it just for aesthetic purposes? | Technology | explainlikeimfive | {
"a_id": [
"ecuntri",
"ecur41g",
"ecunuse"
],
"text": [
"It more closely matches cinematic screens, making the migration of films from theaters to screens more appealing. Prior to this, two techniques were used to try to put big screen movies on television. The first is “pan and scan” where the m... | [
"url"
] | [
"url"
] | |
aau6ew | How do seeds in video games work? | Like how in the binding of Isaac it gives you a string of eight (?) letters and numbers, and if someone else plugs in those digits they get the exact same run. How does this work? Are these values stored somewhere? | Technology | explainlikeimfive | {
"a_id": [
"ecv0bmn",
"ecv0m1t"
],
"text": [
"The seed is converted into a number, which is then used to load a [Pseudo-random number generator]( URL_0 ). The PRNG is a mathematical formula that generates a list of seemingly random sequence of numbers. The game then uses this sequence of numbers to g... | [
"url"
] | [
"url"
] |
aau8wg | How does a country "shut down" the internet? | Technology | explainlikeimfive | {
"a_id": [
"ecv0jds",
"ecv0ogc",
"ecv0wq7"
],
"text": [
"Many countries, especially smaller ones, have only a very small number of telecom companies. If they (under government orders) turn off their network router devices, almost no one in the country has Internet service.",
"It's not shuttin... | [
"url"
] | [
"url"
] | |
aauj0h | Server vs. External HDD/SSD | Is a server basically just a bunch of hard drives connected to the internet or is it something else? | Technology | explainlikeimfive | {
"a_id": [
"ecv2mtp",
"ecv3e7k",
"ecv6raa"
],
"text": [
"A server is just a high powered computer. They have all the components a regular computer has, and they usually have an array of hard drives rather than just one hard drive.",
"To be clear, a server is just a name for a device that acts... | [
"url"
] | [
"url"
] |
aavf32 | Why do some search engines change predictions, even though I'm typing the suggested letters? | For example, Windows 10 search: "n" = > "Notepad" "no" = > "Notepad++" "not" = > "Notepad++" "note" = > "Notepad++" "notep" = > "Notepad" "notepa" = > "Notepad" "notepad" = > "Notepad" (Example found in /u/Wargon2015 's comment on reddit, happens on many occasions, though.) | Technology | explainlikeimfive | {
"a_id": [
"ecv9xd7",
"ecvgl2n",
"ecvyo2x"
],
"text": [
"One possible idea I know to explain that, is that it's designed as a user experience thing. You start typing, and it makes suggestions, you click them if you want those. If not you keep on typing, so you're telling the system that the sugge... | [
"url"
] | [
"url"
] |
aavhce | How are modern cartoons made? | Technology | explainlikeimfive | {
"a_id": [
"ecvcx5p"
],
"text": [
"Anime is still hand drawn. If you watch the after credit, there are keyframe animator (原画), secondary keyframe animator (第二原画), and much more. Most of them are drawn on paper and scan to computer."
],
"score": [
3
],
"text_urls": [
[]
]
} | [
"url"
] | [
"url"
] | |
aawz3i | Ackermann function | Also what does primitive recursive mean? How Does the function relate to the hyperoperation hierarchy? | Technology | explainlikeimfive | {
"a_id": [
"ecvst4w"
],
"text": [
"I hope I can help you with primitive recursion. So u have set of basic (primitive) functions which are just 3 I think. Constant, successor and projection. Each of these takes some input and produces output. The first one is pretty straightforward and always returns the ... | [
"url"
] | [
"url"
] |
aaxyfc | How do navigation apps like Waze work without creating new traffic? | Technology | explainlikeimfive | {
"a_id": [
"ecvvyyj",
"ecwbbyo"
],
"text": [
"I used Waze going into NYC once. It rerouted every 3 minutes. This way is 2 minutes faster, this way is 5 minute faster, over and over. It never occurred to me that doing just that, incidentally moving the traffic jam around.",
"> It seems like it’s j... | [
"url"
] | [
"url"
] | |
aayb2z | Why did controllers in the 80s and 90s require calibration? How come we dont need to calibrate controllers now? | Technology | explainlikeimfive | {
"a_id": [
"ecw15sk",
"ecw039o"
],
"text": [
"The way older joysticks were built, the software had no way of knowing where the 'center' was, and how far the joystick could move before it hit max tilt - so it had to measure those values itself. (Similar to taring a scale). These days there are little ... | [
"url"
] | [
"url"
] | |
aaybjv | how do flea collars work? | I never understood how it wards of fleas successfully unless it courses electricity over an animal’s fur. | Technology | explainlikeimfive | {
"a_id": [
"ecvyd5q"
],
"text": [
"There is a pesticide impregnated in the plastic. It’s safe for dogs but poisonous to bugs, cats and other animals. As the bugs crawls on the fur it kills the insects."
],
"score": [
3
],
"text_urls": [
[]
]
} | [
"url"
] | [
"url"
] |
aayu0n | Why do homing missile explode even though it hasn't hit the target? | I've observed this in a lot of movies that a jet is being targeted by a homing missile and decided to increase the speed and do some stunts to dodge the homing missile but then the homing missiles explodes without even touching something. | Technology | explainlikeimfive | {
"a_id": [
"ecw3auq",
"ecw3uiv",
"ecw3h5f",
"ecw5k7i"
],
"text": [
"The answer for movies is probably \"it looks cool\" much. However, many anti-aircraft missiles are designed to detonate a short distance away from the target, not just on direct hits.",
"A missile damages the plane by shr... | [
"url"
] | [
"url"
] |
ab0tiy | My Phone Charger | Does a plugged-in wall charger still draw electricity even when it's not charging? If not, how does my phone battery tell it to 'turn on' then? Please explain like I'm 2 yrs old instead. | Technology | explainlikeimfive | {
"a_id": [
"ecwkmv5",
"ecwktsh"
],
"text": [
"It might use electricity but only an incredibly tiny bit. The way your phone tells it to start charging is by completing a circuit. When nothing is plugged into the charger the circuit is open and no electricity is flowing. When you plug your phone in the... | [
"url"
] | [
"url"
] |
ab16jf | Does my phone check every second to see if the current time matches the time of a previously set alarm so it can trigger that alarm? How are these scheduled events generally triggered? | Technology | explainlikeimfive | {
"a_id": [
"ecworxr",
"ecx5mih",
"ecwv5zt"
],
"text": [
"Your phone is literally just a computer. Computers have a piece of software called a scheduler. Schedulers are a fundamental part of the operating system and do way more than simply check for your alarms. They coordinate all of the other so... | [
"url"
] | [
"url"
] | |
ab28ce | What does it mean when it says music is "Remastered"? | Technology | explainlikeimfive | {
"a_id": [
"ecwzdhc",
"ecwx8q4",
"ecyux3u"
],
"text": [
"TLDR: Processing an original audio recording to make it sound better. A master is the original recording used for an album, usually on Analog tape. Armed with the knowledge that the technology and techniques used in the audio industry have ... | [
"url"
] | [
"url"
] | |
ab4owo | How is it that games become poorly optimized? | Technology | explainlikeimfive | {
"a_id": [
"ecxiajo",
"ecxmo2j"
],
"text": [
"It can be anything from sloppy code to non-efficient ways of solving problems. A lot of things can cause performance issues and they can’t always fix all of them. It is extremely case specific.",
"Games companies are businesses. They are actively tryi... | [
"url"
] | [
"url"
] | |
ab4y4y | i've been watching old VHSs from my childhoods and I wonder how they work. Specifically, when you rewind it, how does it just play the film backwards? What mechanism exists so you can watch the film forward (with sound), and backward (without sound). | Technology | explainlikeimfive | {
"a_id": [
"ecxlu1j"
],
"text": [
"VCRs record the video in stripes diagonally across the tape. This is done by placing the heads that read the video on a rotating drum, set at an angle to the tape. The video is stored as an analog signal, so even if there are problems with it, you still get a signal. So... | [
"url"
] | [
"url"
] | |
ab5gv1 | What exactly are polarized lenses and what makes them "better" than non-polarized lenses? | Technology | explainlikeimfive | {
"a_id": [
"ecxor93"
],
"text": [
"Natural light from the sun or even from a light bulb is radiating out in all different directions and angles. The oscillations are overlapping and chaotic; or what we call \"non-polarized\". The polarizing filter blocks light from all but a very small set of angles so t... | [
"url"
] | [
"url"
] | |
ab6f23 | How is a patient kept alive during a heart transplant? | I imagine that it takes a while to 'install' the new heart, so you can't do the Indiana Jones switch. | Technology | explainlikeimfive | {
"a_id": [
"ecxu35g",
"ecxwhyw"
],
"text": [
"They use a bypass machine, which puts your blood through a pump that can oxygenate and remove CO2 from your blood.",
"Machines. One breathes for you, one pumps your blood. What I found to be an interesting side-note; a surgeon told me that every perso... | [
"url"
] | [
"url"
] |
ab85gl | How can they go back and remaster old movies in 4K when the technology did not exist when the movie was filmed? | Technology | explainlikeimfive | {
"a_id": [
"ecy6jkm",
"ecy6sxw"
],
"text": [
"The technology did exist back then. 35mm film is closer to 4k resolution and has been used for major films since the 1920s. So basically they sort of did have \"4k cameras\" for over one hundred years. When you see a grainy, low resolution black and white... | [
"url"
] | [
"url"
] | |
aba8od | How do electronics keep memory after you take all power sources away? | When I turn my phone off and take the battery out, how does it remember what all my setting were and then boot up like nothing happened? How can a flash drive that’s been sitting in a garage for 5 years remember what was put on it? I keep trying to think of how it’s possible but I just can’t wrap my mind around it. So ... | Technology | explainlikeimfive | {
"a_id": [
"ecyoppl",
"ecyvnk1",
"ecyp80x",
"ecyylmz"
],
"text": [
"Memory is basically just millions of light switches. Each light switch is called a bit. The bits can be flipped to \"on\" or \"off\" represented as 1 and 0. Eight bits make a byte. A thousand bytes make a kilobyte. A thousand... | [
"url"
] | [
"url"
] |
abayit | Why GPS works on my phone in airplane mode? | On flights I'm able to see where we are on Google maps even with Airplane mode on. | Technology | explainlikeimfive | {
"a_id": [
"ecyuqb3",
"ecz3qcs",
"ecz8lfd"
],
"text": [
"Your phone only has a GPS receiver. It only listens to GPS signals, in contrast to wifi or cellular data where it both gets data and sends data. Additionally, even if you turn off airplane mode of course you will still not receive cellular ... | [
"url"
] | [
"url"
] |
abbe8j | What was the Y2K problem, what was the potential outcome, and how was it averted? Will we ever encounter something similar? | Technology | explainlikeimfive | {
"a_id": [
"ecz2345",
"ecyz8wo",
"ecz02hq",
"ecz1j5h",
"ecz5301"
],
"text": [
"A real world example: I worked as a programmer for a payroll services company in the late 90's. Part of my job was changing the software that ran the payrolls to use 4 digit years instead of 2. Now lets say you... | [
"url"
] | [
"url"
] |
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