q_id stringlengths 6 6 | title stringlengths 4 294 | selftext stringlengths 0 2.48k | category stringclasses 1
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evggiu | Why are TVs and pictures rectangular when camera lenses are circular? | Technology | explainlikeimfive | {
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"The lenses are circular but the sensor inside the camera is rectangular or almost squarish depending on the format.",
"Not only are modern cameras built with square censors, but analog cameras recorded photographs and video on squared pieces of film. ... | [
"url"
] | [
"url"
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evl3ax | Does anyone here know what drop shipping is, or how it works? | Recently came across this term, and that it was some kind of online scam (?) or something, similar to forex trading (?). Couldn't get through enough of the Wiki to understand wtf was going on. Was hoping someone could explain | Technology | explainlikeimfive | {
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"text": [
"Drop shipping is when a vendor sells and charges you for goods but does not send those goods to you from their own warehouse. They, in turn, buy them from (usually) a much larger seller and send the goods directly to you inst... | [
"url"
] | [
"url"
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evncir | What exactly is an SSLVPN? | Technology | explainlikeimfive | {
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"ffwufc6"
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"text": [
"SSLVPN's secure connections so that people outside can't see what is going on. It's a Secure Socket Layer Virtual Private Network. The SSL part is just a type of encryption. For this example, I'm focusing on VPN's as service rather than point to point VPN's used in busi... | [
"url"
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evot0z | how does software harvest your clicks and then sell them to third parties? | Technology | explainlikeimfive | {
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"text": [
"If you’re referring to that antivirus post from earlier, the software reads what you’re clicking links too and what you’re doing. That information is valuable to advertisers so they see what a person like you does. It’s a pretty simple application, kinda ... | [
"url"
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evp6iq | How does the SAR sensor work in smartphones? | Technology | explainlikeimfive | {
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"text": [
"Let's make it more ELI5 than the current best answer: Electricity is weird. There's actually a tiny electrical field *around* your body... | [
"url"
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evpxf9 | TCP and UDP in networking | These are two terms that when I hear them and then try and Google for answers, I'm just left even more confused than I was in the first place. | Technology | explainlikeimfive | {
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"TCP: - A: \"Hey can we talk?\" - B: \"Sure we can talk\" - A: \"Great, going to start sending you stuff now\" - A: \"Hey I'm sending you something, did you get that?\" - B: \"Yes I got it, here's my response, did you get that?\" *message lost in transmission* - B: \"Yes... | [
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evreox | How come you can uninstall a mobile app while its working in the background but you cant do the same on PC? | Technology | explainlikeimfive | {
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"ffxjxcu"
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"text": [
"You sure can, just blow the sucker out of the water with task manager if it refuses to quit when asked. Android does the same automatically. The task won't exit? [Let's see if it can parry a SIGKILL.]( URL_0 )"
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"... | [
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evsbef | Does leaving your phone on the charger after it's fully charged damage the battery and eventually cause a shorter battery life? | Technology | explainlikeimfive | {
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"text": [
"No, the purpose of the battery controller chips is to prevent these problems.",
"The new iPhone operating system alters your charging for this reason. If it notices that you are taking it off the charger when you wake up every morning a... | [
"url"
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evtb6r | How did explorers and map makers have an accurate layout of the shape of the continents and countries prior to aerial vehicles? | Technology | explainlikeimfive | {
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"ffxuhro"
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"text": [
"They measured them with an optical sight and long measuring tapes. This is how surveying worked until quite recently. The sight might be as simple as a [Plane Table]( URL_0 ) or a complex [Theodolite]( URL_1 )."
],
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... | [
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evvcao | Why Is it so Hard in 2020 to Print Special Characters (é, œ, à, Û, etc.)? | Technology | explainlikeimfive | {
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"ffy96ra",
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"text": [
"Technology has solved this problem a long time ago. Those keys are easily available using ASCII, and on mobile by holding the character you need. However, many of the people making labels and things aren't actually that interested in their jobs AND have n... | [
"url"
] | [
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evxd1h | When you delete files permanently off your hard drive, where do they go and how does it work? | Technology | explainlikeimfive | {
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"ffykgl9",
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"text": [
"They don't really go anywhere with a normal delete. Your computer knows where things are in memory by putting little markers at the start and end of sections that contain data. When you delete something it just removes the markers, which le... | [
"url"
] | [
"url"
] | |
evy7b5 | How can computers render millions of polygons PLUS tesselation but start slowing down when you try to get them to put high res 2d textures over an object? | Technology | explainlikeimfive | {
"a_id": [
"ffysn6o"
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"text": [
"Its mostly about RAM use and data bandwidth. 2d Textures take up a surprisingly large amount of space. A model may have millions of triangles, but a 2048x2048 texture has millions of pixels, and the amount of data taken up by a 2D color pixels is about the same as a 3D ... | [
"url"
] | [
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] | |
ew0loo | When your on the phone and it's on loudspeaker whats stopping it from echoing back? | Technology | explainlikeimfive | {
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"text": [
"Modern smartphones, since at least the Nexus One, have a secondary microphone. This microphone detects 'ambient' noise in an attempt to limit what the primary microphone actually sends to the distant end. When you put the phone on speaker, this microphone... | [
"url"
] | [
"url"
] | |
ew0vph | How do devices transfer information wirelessly and how can the transfer speed be altered? | Technology | explainlikeimfive | {
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"ffz6n6x"
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"text": [
"Radio: Your phone, laptop, etc. have radio antennas on their Wi-Fi cards. It's the same mechanism that TV, conventional radio and Bluetooth use. Wi-Fi has a problem, though: If you have 100 devices in the same area, they constantly interfere with each other. Imagine 100... | [
"url"
] | [
"url"
] | |
ew36ju | How can digitally filmed movies be remastered? | I read on previous ELI5 that celluloids can be always rescanned with higher resolution devices and that's why you can get HD, Full HD, 4K remasters of classic Sci-fi movies for example. But what happens when the film is completely made by digital cinematography? I got this because reading Vidocq was filmed like that. A... | Technology | explainlikeimfive | {
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"text": [
"You’re partly right but the filesize doesn’t have much in common with the files resolution. Sure, it increases when you add more pixels but that actually depends on the used compression. It’s right that you can’t just scale a... | [
"url"
] | [
"url"
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ew4sr6 | how do car heaters get their heat? | Technology | explainlikeimfive | {
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"text": [
"The water that’s pumped around the engine to keep it cool is routed to the inside of the car. That water is of course hot from taking the heat away from the engine. Under the dash board in the ca... | [
"url"
] | [
"url"
] | |
ew4ukf | Why do you need to press so many buttons to start a plane? Can’t there be just one button to start everything in sequence automatically? | Technology | explainlikeimfive | {
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ew5r1c | Why is “turning it off and on again” an effective troubleshooting technique? | Technology | explainlikeimfive | {
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"ffzuv12"
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"text": [
"I saw this explained years ago by another redditor I can’t remember or find: Imagine you’re at a hotel and you call down to the front desk to ask for something. The person there answers your call, completes your request and then hangs up the phone, ready for the next ca... | [
"url"
] | [
"url"
] | |
ewc48o | Why were Blackberries considered more secure then phones of other operating systems? Are blackberries still more secure then what we currently have ? | Edit; Blackberry as in the phone company/ OS. Not the fruit. | Technology | explainlikeimfive | {
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"text": [
"Before the complete proliferation of smartphones, they used to be a thing that only high powered business/government people could afford and seen mostly as a productivity tool rather than a life partner. Many people didn't even buy them out... | [
"url"
] | [
"url"
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ewm3zz | How do radio waves travel to the opposite side of the planet? How do they overcome the curvature of the earth? | Does the signal simply pass through multiple radio towers? | Technology | explainlikeimfive | {
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"text": [
"If you are asking about single transmitters, some types of radio waves have trouble piercing the atmosphere and “bounce” off. This allows stations over-the-horizon and out of line-of-sight to pick up the signal. You’re right that there are more complicated network metho... | [
"url"
] | [
"url"
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ewmbvk | How do computers work? | Technology | explainlikeimfive | {
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"text": [
"There are a *lot* of layers in between those two. It isn't a direct conversion from a binary number to an image. A CPU has two main components, the processing unit and the control unit. The processing unit can store small amounts of data, do basic math an... | [
"url"
] | [
"url"
] | |
ewo8bx | is there really a security difference between http:// and https://? Should I not browse http:// sites unless I’m in incognito mode? | Technology | explainlikeimfive | {
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"text": [
"HTTP means that you and the website are sending postcards back and forth. Any mail carrier could just read the postcards, if they wanted, before delivering it to you. Sending your credit card number on a postcard would be horribly insecure.... | [
"url"
] | [
"url"
] | |
j2ydd4 | When streaming services (e.g. Spotify, Netflix) let you download content onto your device, how do they make sure that you won’t somehow keep that content after you’ve unsubscribe from the service? In other words, how do they prevent you from stealing it? | Technology | explainlikeimfive | {
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"text": [
"They encrypt the media files when you download or stream them. This is called Digital Rights Management (DRM). They limit how you can use the files you download or stream. They require you to use a supported browser (or their app) and to sign in to an acc... | [
"url"
] | [
"url"
] | |
j33hgz | how come my phone can run Playstation 1 emulators but the PlayStation 5 can't do backwards compatibility? | Technology | explainlikeimfive | {
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"text": [
"They will probably let you buy psn versions of some games, which will be emulated. They want you to buy the games again. They don't want you playing discs that they no longer can make money on.",
"Who says ... | [
"url"
] | [
"url"
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j372mz | Why does wanting protect my data from large companies instantly mean I have something to hide? | Technology | explainlikeimfive | {
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"text": [
"It doesn't, nor does wanting privacy from the government. This notion flips the whole idea of innocent until proven guilty on its head. It also subverts the right to privacy. That said corporations aren't bound by the 4th amendment like gov... | [
"url"
] | [
"url"
] | |
j3isz0 | What is a subnet mask and how does it work? | All of the explanations I've had are very long and have words that I do not understand in the slightest so help would be highly appreciated | Technology | explainlikeimfive | {
"a_id": [
"g7cpa1r"
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"text": [
"Imgine you live in an apartment building and want to send a letter somewhere. How do you know if that letter should go to the post box outside the building, or in the mail slots in the lobby? Simple: you look at the address! If the address is the same as your address bu... | [
"url"
] | [
"url"
] |
j3l7ou | How do the saws they use for hard casts not cut the flesh underneath? | Technology | explainlikeimfive | {
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"g7codnk",
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"text": [
"They don’t spin, they vibrate back and forth. Hard materials like plaster and fiberglass are brittle to the vibration of a metal blade. Human skin is malleable enough to absorb the vibration.",
"The materials used in cast... | [
"url"
] | [
"url"
] | |
j3lr2t | what are the reasons some game engines for video games are “better” than others for certain games? Why do some have more bugs? I always hear “this game would have been better if the engine wasn’t so buggy”. | Technology | explainlikeimfive | {
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"text": [
"ELI5: and engine is really just a toolbox that comes with tools in it. Most times those tools are good for general uses. Hammer, screwdriver, scissors. But sometimes you need tool not everyone has like vice grips, pipe wrench, utility knife. If you need t... | [
"url"
] | [
"url"
] | |
j3m4x3 | - How do tiny remote islands receive electricity and internet service? | I understand that power is delivered to places by an electric grid and that there are hydro electric dams or wind farms. I understand that high speed internet is delivered to homes the same way. But how do tiny, remote islands in the middle of the ocean have electricity or internet access? What's the source for power o... | Technology | explainlikeimfive | {
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"g7cw675",
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],
"text": [
"If the island is sufficiently large, it will have its own power plant on the island. If the island is sufficiently close to the mainland or another large island, then undersea cables can connect power grids. But for the tiniest and remotest islands, it's ... | [
"url"
] | [
"url"
] |
j3n15r | How is South Korea the forefront of cell phone technology (5g, soon 6g)? Why are other nations like the United States lagging behind? | Technology | explainlikeimfive | {
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"text": [
"In Asian nations governments are deeply involved in infrastructure development. Not just communications, but electricity, roads, bridges. There are national development plans. In the US all these (and many othe... | [
"url"
] | [
"url"
] | |
j3oej7 | what is a DDOS attack and how can someone target your IP and cause your online game to lag in within seconds? | I play a lot of R6 siege and I’ve played games where my ping is in the 10’s of thousands even though I have very reliable internet. | Technology | explainlikeimfive | {
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"g7dbse1"
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"text": [
"DoS: denial of service. From a single machine, send another machine a lot of data trying to overload it such that it can't or at the very least has trouble trying to respond to new requests. DDoS: distributed denial of service; same as above, but it's from multiple comp... | [
"url"
] | [
"url"
] |
j3tfp8 | How can you play music while in a call and the other person not hear it? | Technology | explainlikeimfive | {
"a_id": [
"g7ecmw9"
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"text": [
"It's an echo cancellation. Your phone knows what's being played from the speakers and so it can subtract (remove) that before sending your voice."
],
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j3uts6 | Why do we measure the screen sizes in inches instead of ISO standard units? | I mean outside of the USA. Phones, laptops, monitors, TVs, all are measured and advertised in inches. Why? (Clarification: On ISO standard unit I mean meter (or cm). I just wanted to be PC.) | Technology | explainlikeimfive | {
"a_id": [
"g7ehluy",
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"text": [
"Measurements are made in normal metric units, even in the US. Advertising is made up by ad agencies. They use actual measurements as little as possible, to try and get descriptions that sound more appealing. In they think inches are better, or rediculous ... | [
"url"
] | [
"url"
] |
j3w5d1 | how ARM CPU are different from regular CPUs | Technology | explainlikeimfive | {
"a_id": [
"g7erft3"
],
"text": [
"There is no \"regular\" CPU - x86 is the most _common_ CPU, but there's no official designation. ARM and x86 are lists of instructions that the manufacturers say \"Our CPUs will be able to do < this list of things > , and you tell them to do these things using < this pa... | [
"url"
] | [
"url"
] | |
j3ziq8 | My internet was being slow < 5Mbps so I called my ISP and they were able to send a signal to get it to 500Mbps, how does this work? | How or what could have caused the speed and what are they doing on their end to fix it? | Technology | explainlikeimfive | {
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"text": [
"There are a whole range of things they might have done. \\- They might have just rebooted your router. Sometimes a simple reboot fixes things. \\- They might have assigned you to a different IP s... | [
"url"
] | [
"url"
] |
j40528 | why stock markets are still only open during business hours on weekdays now that most trading is electronic | Technology | explainlikeimfive | {
"a_id": [
"g7fghie",
"g7fg1s3",
"g7gmorm"
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"text": [
"There are markets that are open 24/7. But professional brokers work only during business hours, so even if you can trade all the time the most high-profile trades will happen then. Also the closing hour auction result is pretty important fo... | [
"url"
] | [
"url"
] | |
j40gz8 | How do credit cards work? | Technology | explainlikeimfive | {
"a_id": [
"g7figu5",
"g7fh5s2"
],
"text": [
"Magnetic stripes are pretty simple from a technical standpoint: it's basically the same concept as tape cassettes: encode a magnetic field onto a strip of magnetic tape. When that strip moves, it will cause a changing magnetic field which induces a changi... | [
"url"
] | [
"url"
] | |
j42mh8 | How did ancient civilizations know about planets vs stars? | Technology | explainlikeimfive | {
"a_id": [
"g7fzfyt",
"g7g3ahg"
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"text": [
"Planets move, stars do not. Over the course of a year, our angle to the planets changes significantly, and the planets themselves move. The same is not true for stars.",
"To the naked eye planets appear to move in paths across the sky, while the stars... | [
"url"
] | [
"url"
] | |
j457v4 | How does a single speaker play the many different sounds and voices in a song or podcast all at once? | The way I understand it, cars or portable speakers only have one speaker so how do they play many different sounds at the same time? | Technology | explainlikeimfive | {
"a_id": [
"g7gmm5c",
"g7gmnsr"
],
"text": [
"It doesn't make many voices, it makes sound that's the sum of all the voices. When the recording is made the mixer combines all the sounds into one aggregate signal.",
"When there are many sounds, they overlap and create a complex wave. (Even individu... | [
"url"
] | [
"url"
] |
j45dnd | When wearing sunglasses, and i'm looking at my phone, why is it... | Technology | explainlikeimfive | {
"a_id": [
"g7golh3",
"g7gv46j"
],
"text": [
"Sounds like they are polarized lenses. I can see how they work in my head, I just don't know the words, basically, your glasses are a fancy screen and your phone are a fancy screen, and when the lines that let light through from you glasses DONT match up ... | [
"url"
] | [
"url"
] | |
j4br3i | How does an xray show that you have an infection? | Title is self explanatory. | Technology | explainlikeimfive | {
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"g7hupbw"
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"text": [
"NAD but I believe the only X-ray that can show any form of infection is a chest X-ray. Typically a chest extra captures your lungs when clear vs if you have fluid in your lungs or pneumonia you will see what are called infiltrates or darker areas on film in patterns sug... | [
"url"
] | [
"url"
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j4evqc | - section 230 of the internet bill and what is being proposed to be changed | Technology | explainlikeimfive | {
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"g7ifivj",
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"text": [
"Section 230 basically provides for liability protections for social media platform owners against things that are said on their platform. The proposed changes (I've seen many different variations proposed, but they all kinda revolve around ... | [
"url"
] | [
"url"
] | |
j4jgca | how do online games work so well | Technology | explainlikeimfive | {
"a_id": [
"g7j876m",
"g7j96qk"
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"text": [
"No, its called interpolation. The server is taking inputs, and video games still operate in \"ticks\". So the server is able to do math to determine which tick an input belongs. It has algorithms to help account for latency and such and \"smooth\" the dif... | [
"url"
] | [
"url"
] | |
j4jrcu | Why do Monday - Friday "business days" apply to things that don't even need a human at all? | I was tryna cash out my earnings through Flex Pay in the Uber Driver app, which essentially just desposits my earnings automatically into my bank account. No human necessary. So why must I wait until the weekend is over to receive the money, just because it's not a business day, but it doesn't even require a human to d... | Technology | explainlikeimfive | {
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"g7jfmye",
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"text": [
"The simple answer is that a lot of systems which are needed to give you your money were not meant or built to be used 24/7. In the case of banks (which your transaction is handled by) it is done by means of a batch process. Banks are not primarily concern... | [
"url"
] | [
"url"
] |
j4jyug | Why are pant pockets positioned at the front instead of the side? | I notice this with jeans in particular, but I find most pants (men's or women's) have the pockets positioned at the front. There are some exceptions like yoga pants where I've seen pockets positioned on the side. | Technology | explainlikeimfive | {
"a_id": [
"g7jc336"
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"text": [
"The reason for this is functionality. If you take a standard pair of jeans and put the front pocket on the side, you wouldn't have room enough for back pockets. You would go from having four pockets to two. Or just silly looking pants if you added more pockets."
],
... | [
"url"
] | [
"url"
] |
j4k2xe | How do all the different programmers working on the same piece of software arrange all their different lines of code together to form the finished working product? | Technology | explainlikeimfive | {
"a_id": [
"g7jdnru",
"g7je5p1",
"g7jhwum"
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"text": [
"Most teams use what's called a Version Control system which tracks individual changes to files (called \"deltas\"). When one programmer makes a change they push it to the VCS, the next programmer then either accepts that delta into their co... | [
"url"
] | [
"url"
] | |
j4lqjz | Why do programmers actually have to write/type the codes? | I do not have any programming background, just curious about all these memes and jokes about programming. Basically what i'm asking about, is we can arrange things into a full poster just by using programs like Canva, Corel. We can create video out of other videos with Adobe After Effect, etc, but why do programmers ac... | Technology | explainlikeimfive | {
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"g7jsjbt",
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"g7jsia3",
"g7k09j5",
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"text": [
"Yes, it's completely possible. This is what systems like Simulink (a control system modeller in MATLAB) do. But those programs are, themselves, programs and somebody has to write them. In many cases, you pick u... | [
"url"
] | [
"url"
] |
j4mmn9 | How do jet engines create so much thrust? | Technology | explainlikeimfive | {
"a_id": [
"g7k5wyc"
],
"text": [
"Basically jet engines scoop up a bunch of air, heat it up so that it's really hot, and then use that heat in the air to accelerate it to high speeds and send it out the back. This creates tons of thrust. To go slightly more in depth, jet engines are basically momentum e... | [
"url"
] | [
"url"
] | |
j4rtzy | Why do streaming services like Netflix block VPN connections? | I understand that copyright holders prefer to distribute their content through different means depending on the location, I am confused as to why streaming services go to the extent of blocking proxy/vpn connections. Are they not incentivized to provide 'easy bypasses' to the geo-block such that they can remain in good... | Technology | explainlikeimfive | {
"a_id": [
"g7lwxla"
],
"text": [
"> Are they not incentivized to provide 'easy bypasses' to the geo-block such that they can remain in good terms with the copyright holders They would not remain on good terms with the copyright holders. If the streaming service didn't make a genuine effort to prevent co... | [
"url"
] | [
"url"
] |
j4s532 | how does sawdust set off a smoke alarm? | So I was cutting some wood under a smoke alarm and set it off twice today. How is that possible? I thought they were set off by smoke or heat? Thanks! | Technology | explainlikeimfive | {
"a_id": [
"g7lvx1g",
"g7lvqwj",
"g7lvwul"
],
"text": [
"Most smoke alarms have an internal piece of radioactive material that is separated from a sensor (like a Geiger counter) by a gap. Ordinary air does not deflect the radioactive particles, so they reach the sensor. The heavier smoke particle... | [
"url"
] | [
"url"
] |
j4t0jd | Why is it that switching the slots batteries are located in sometimes seems to rejuvenate their power? | Technology | explainlikeimfive | {
"a_id": [
"g7m8pqm"
],
"text": [
"What is actually happening is corrosion is building up on the metal connections. This corrosion is almost always present in some way or another, and this corrosion actually impedes the flow of electricity, but batteries that are still fully charged are able to “punch th... | [
"url"
] | [
"url"
] | |
j4vkhq | What is Overcurrent Protection? | Technology | explainlikeimfive | {
"a_id": [
"g7nal4e"
],
"text": [
"It is a more accurate name for a fuse. The name comes from the way it protect any circuit from too much current being drawn. Typically this is due to a short circuit. Wires and connectors are designed for a specific maximum current draw. If something draws too much curr... | [
"url"
] | [
"url"
] | |
j4xw7e | Why do fans come in 1 or 3 speed settings, but hardly ever 2, 4, or more speed settings? | Technology | explainlikeimfive | {
"a_id": [
"g7ofgoc",
"g7om24m"
],
"text": [
"Low-Medium-High is an extremely common way for us to scale things, so it makes sense to build our products to mirror that preference. It's also a lot simpler and cheaper to have a 3-position switch than a six position one.",
"Electric motors can have ... | [
"url"
] | [
"url"
] | |
j4yc9e | What is dialysis and how does it work? | Technology | explainlikeimfive | {
"a_id": [
"g7oftb9",
"g7ournb"
],
"text": [
"It's a process of purifying blood. Your blood carries oxygen and food to your cells and carries away the waste from the cells. The blood is then filtered in the kidneys. If your kidney doesn't work properly then your blood gets filled with waste products ... | [
"url"
] | [
"url"
] | |
j522jf | Computer Programming | Technology | explainlikeimfive | {
"a_id": [
"g7p28xd",
"g7p1t4i"
],
"text": [
"\"Programming\", \"writing programs\", and \"coding\" mean the same thing. Really pedantic people might differentiate between \"scripting\" and \"programming\" but at the end of the day, it's all typing up instructions for a computer to follow. There are ... | [
"url"
] | [
"url"
] | |
j5b8qj | Why do some sites put a box when you press ctrl backspace when it should delete the entire word? | Technology | explainlikeimfive | {
"a_id": [
"g7r0jh8"
],
"text": [
"Not all text boxes are created equal. Some are programmed to behave differently according to certain inputs. In this case ctrl+backspace will delete an entire word according to the way some are designed, and others will insert a \"box,\" which is a visual representation... | [
"url"
] | [
"url"
] | |
j5cu0g | What exactly do we have to do in a hackathon? | Technology | explainlikeimfive | {
"a_id": [
"g7r8ubc"
],
"text": [
"Throw stuff together to create a minimum viable product. For example, there might be a hackathon for “digital beauty solutions”. Your team would then create an app that scans the user’s face and render different skin tones based on makeup, etc."
],
"score": [
4
... | [
"url"
] | [
"url"
] | |
j5cyqt | How does almost 4k resolution games display on 4k a monitor. | Technology | explainlikeimfive | {
"a_id": [
"g7rav6u"
],
"text": [
"Either the monitor or game itself or both will do what's called upscaling. A TV or monitor will generally be able to accept only specific resolutions, and a device sending video will only be able to send specific resolutions. The two devices will actually talk to each o... | [
"url"
] | [
"url"
] | |
j5d6db | How do shopping carts know when they're being taken out of the parking lot and to lock up? | Technology | explainlikeimfive | {
"a_id": [
"g7rapde",
"g7rf7x9"
],
"text": [
"Magnets. Little antennas in the wheel lock pick up a certain magnetic field that is placed in the ground. Then they clamp down on the wheel when they pass over it. Its pretty simple and smart.",
"Where is this a thing? At least where I live shopping c... | [
"url"
] | [
"url"
] | |
j5f67p | How do thermal cameras work? | Technology | explainlikeimfive | {
"a_id": [
"g7rldk5"
],
"text": [
"Exactly the same way as any other camera, only the sensor in them is tuned to pick up light in the infra-red portion of the spectrum rather than visible light. Hot things radiate infra-red light, and the hotter they are the more of it they radiate, so the camera picking... | [
"url"
] | [
"url"
] | |
j5fymb | How are scientist able to see atoms? | Technology | explainlikeimfive | {
"a_id": [
"g7rr7l0"
],
"text": [
"The best way to visualize atoms is through the use of an atomic force microscope. This consists of a needle that has been sharpened to a single atom at the tip. This needle is connected to some machinery that detects where the tip is in space. The needle is then moved a... | [
"url"
] | [
"url"
] | |
j5gp9b | Why does a laptop screen looks bad when it is taken with a camera? | Technology | explainlikeimfive | {
"a_id": [
"g7rxu7q"
],
"text": [
"Your laptop screen is a grid of pixels, and your camera(unlike your eye) is also a grid of sensors. Unless you perfectly align each sensor to each pixel you will get Moire patterns."
],
"score": [
9
],
"text_urls": [
[]
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} | [
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j5hmlf | How does stores alarm know when to go off when someone tries walk out with a stolen item? | When walking out of a store and the alarm goes off because of stealing. How does the cash register send a signal to the alarm so, it doesn't go off when you walk out the door with a paid item. Also, if someone is to steal; for example, batteries out of the box. Would that be a loop hole in the thief alarm system....doe... | Technology | explainlikeimfive | {
"a_id": [
"g7s0pru",
"g7s2izf"
],
"text": [
"There are RFID tags hidden in the item. When you walk out the security system notices the chip and sets off the alarm.",
"There are passive RFID tags in the packaging. These need to be deactivated at register, usually by passing the item over a surfac... | [
"url"
] | [
"url"
] |
j5kppx | Why do computers force updates on you at certain points? Like “screw whatever you’re doing it’s update time!” Kind of thing. | Technology | explainlikeimfive | {
"a_id": [
"g7slazv",
"g7ske64",
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"g7uawc3",
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],
"text": [
"The biggest reason is security... | [
"url"
] | [
"url"
] | |
j5n7dc | Why are games like MW so heavy (250GB)? | I don’t really understand what makes it so so heavy and there are some other games with better graphics that are less heavy. | Technology | explainlikeimfive | {
"a_id": [
"g7t12is",
"g7tanxq",
"g7u5gwl"
],
"text": [
"Because they have lots of high res textures plus any videos e g. cutscenes. Their actual code will be tiny in file size in comparison.",
"Things like images and audio are tremendously huge files. Because of this they are almost always c... | [
"url"
] | [
"url"
] |
j5nlv1 | Why do bands with their own drummers sometimes use samples of drum beats? | Oasis and Slipknot have both used samples of the Amen Break. Why couldn't their drummers just play that rhythm if that's what they wanted? | Technology | explainlikeimfive | {
"a_id": [
"g7t3tlf",
"g7teqez"
],
"text": [
"If it’s a specific sample (example: Bonham’s beat from When the Levee Breaks is often used in hip hop) you want the original sound because to recreate that beat you’d need very specific room mics and natural room reverb etc. so it’s easier to use the samp... | [
"url"
] | [
"url"
] |
j5p6gz | How does a gaming system, CD player, etc. read a disc? | Basically the title | Technology | explainlikeimfive | {
"a_id": [
"g7tdl6p"
],
"text": [
"It shines a laser into the disc. How the disc was cut or burned will affect how the laser light is reflected back, and then the optical drive can deliver the bit pattern that is indicated by the reflection. This is also why optical media lasts a very long time (nothing ... | [
"url"
] | [
"url"
] |
j5rnlb | How can a speaker/headphone driver, which moves in a linear, 2-dimensional plane and should thus give equal sound all the way round the membrane, make the audio sound 3-dimensional? | If I wear a pair of headphones and play an FPS (first person shooter), I can hear that there is an enemy behind to the left. How is this possible if the driver/membrane is moving "parallel" to my ear canal? | Technology | explainlikeimfive | {
"a_id": [
"g7tv8tz"
],
"text": [
"Your headphones are providing slightly different signals to each ear. Your brain assumes this is due to one sound source that’s physically distant from you at an angle. Your individual ears can’t sense direction, it’s only the combination of two, and comparing phase, th... | [
"url"
] | [
"url"
] |
j5xqps | How does technology like an Apple Watch or Owlet Smart Sock track Blood Oxygen levels? | Technology | explainlikeimfive | {
"a_id": [
"g7v1ozd",
"g7v2njk"
],
"text": [
"I’m not sure about the Apple Watch, but the owlet smart sock is a pulse oximeter. You have one side that emits light, and then a light sensor on the other side. You place a finger (or in the owlet’s case, a foot) between the light source and the sensor. H... | [
"url"
] | [
"url"
] | |
j5yfv3 | how do those cassette tapes that plug into an aux cord work? | I cannot even think of a way that digital media can be transferred into cassette form to play in your car. | Technology | explainlikeimfive | {
"a_id": [
"g7v6b2k",
"g7v61r7",
"g7vo6xc",
"g7vrcl3",
"g7vqqe9",
"g7vbnc0",
"g7x0cue",
"g7vqeno",
"g7vy5ou",
"g7xb6yi"
],
"text": [
"Magnetic tape records audio as a change in in magnetic field strength of the tape. As the tape slides over the read head the changing m... | [
"url"
] | [
"url"
] |
j60tyx | How do 3rd party sites download youtube videos? | I know a bit of coding including very basic html, but how do sites, given a youtube videos url download that video? | Technology | explainlikeimfive | {
"a_id": [
"g7vjs7i"
],
"text": [
"They request YouTube to watch the video, buy they instead send the actual file to you, it’s actually pretty trivial to do, the easiest way is finding the actual video URL (which is not the YouTube link) in the webpage and using a get request to download it. You can pret... | [
"url"
] | [
"url"
] |
j60x54 | Why is 2.4Ghz Wifi NOT hard-limited to channels 1, 6 and 11? Wifi interference from overlapping adjacent channels is worse than same channel interference. Channels 1, 6, and 11 are the only ones that don't overlap with each other. Shouldn't all modems be only allowed to use 1, 6 or 11? | Edit: Wireless Access Points, not Modems I read some time ago that overlapping interference is a lot worse so all modems should use either 1, 6, or 11. But I see a lot of modems in my neighbourhood using all the channels from 1-11, causing an overlapping nightmare. Why do modem manufacturers allow overlapping to happen... | Technology | explainlikeimfive | {
"a_id": [
"g7vkjvo",
"g7vjtmb"
],
"text": [
"WiFi is not the only technology using the 2.4GHz ISM band. It shares it with Bluetooth, microwaves, radars and a load of other consumer electronics such as garage port openers, two way radios, remote light switches, weather stations, etc. So it may not be... | [
"url"
] | [
"url"
] |
j637do | Does my GPS watch emit anything hazardous? | Technology | explainlikeimfive | {
"a_id": [
"g7vuvz1",
"g7vwlnm",
"g7vuqpf"
],
"text": [
"No, GPS devices receive a signal it does not transmit anything. You are exposed to the signals from GPS satellites no matter if you own a GPS device or not. To answer your question, no GPS signals do not effect you in any measurable fashion... | [
"url"
] | [
"url"
] | |
j64zvb | What’s the difference between a png and a jpg | Obviously there is some type of difference, otherwise there wouldn’t be two different image types, but I’ve never been explained what the difference is. | Technology | explainlikeimfive | {
"a_id": [
"g7w575g",
"g7w59dd",
"g7w9qi6",
"g7w5aol"
],
"text": [
"They use different compression algorythms. Because of this JPG images lose some quality during compression to make them \"lighter\" (less MB), while PNG images don't lose quality. They are a bit heavier as a result though.",
... | [
"url"
] | [
"url"
] |
j66y9s | why does music sound so different through headphones compared to listening in your computer or in your car? | Technology | explainlikeimfive | {
"a_id": [
"g7wia8q"
],
"text": [
"3 things, first is that bigger speakers can push more air so they can recreate more of the low end than smaller speakers in headphones can second is the space, headphones directly put the sound in your ears. Where as speakers in a car, some of the sound goes to your ear... | [
"url"
] | [
"url"
] | |
j68kqf | How do ISP’s change internet speeds? | Let’s say I have a 100mbps internet connection. I call the ISP and pay extra for a 200 mbps connection, and it gets faster with no new hardware. Does someone turn a knob somewhere? Thanks. | Technology | explainlikeimfive | {
"a_id": [
"g7wz5g7",
"g7wtfly",
"g7xbtqj",
"g7x8mj5"
],
"text": [
"Former Tier II internet tech support for a small ISP that didn't have it's shit together checking it! Regardless of if you're connected via fiber, ethernet, or cable modem generally speaking the larger network you're connecte... | [
"url"
] | [
"url"
] |
j68mwq | How does a smart scale determine your water percentage, amount of muscle weight and visceral fats by just standing in it? | Technology | explainlikeimfive | {
"a_id": [
"g7wt4e1",
"g7xcmd4"
],
"text": [
"You notice how they have metal plates to put your feet on? Thats so they can run a small electrical current from one to the other, passing through your body. They measure the resistance (impedance) and use that to determine how much body fat and water con... | [
"url"
] | [
"url"
] | |
j6j3jg | What is a proxy server, reverse and forward types? | Technology | explainlikeimfive | {
"a_id": [
"g7z1arx",
"g7z9gz9"
],
"text": [
"It's like when you want to tell a boy/girl that you have a crush on them, but instead of telling them directly, you tell your best friend to tell them.",
"Proxy server: A machine which passes on (typically HTTP) requests on behalf of you, the client. ... | [
"url"
] | [
"url"
] | |
j6k9wo | Why does applying pressure to an led screen cause it to warp and show green lines and shapes? | Basically exactly what the title says. Why when I press on my laptop screen does it seemingly warp and make weird shapes and colors. | Technology | explainlikeimfive | {
"a_id": [
"g7z4o4t"
],
"text": [
"There's a white light in the back of an LCD called the backlight. LCD is short for Liquid Crystal Display. Inside the display is something called a TFT - Thin Film Transistor. The TFT uses electricity to magically change the color of the liquid, this creates pictures. W... | [
"url"
] | [
"url"
] |
j6l51c | Why haven't we created machine that produce food from water and sunlight like plants? | Technology | explainlikeimfive | {
"a_id": [
"g7z651p",
"g7z65s7",
"g7z6372",
"g7z66yj"
],
"text": [
"We don't know how. Making an artificial plant that turns water and sunlight into food is really hard. Right now, its way easier to just grow more plants than it is to invent a machine that can do the things that plants natura... | [
"url"
] | [
"url"
] | |
j6mo0n | How are well-known piracy websites such as piratebay still up and running despite offering illegal services? | Technology | explainlikeimfive | {
"a_id": [
"g7zeemq",
"g7zf36w",
"g7ze9gl",
"g7zeeef"
],
"text": [
"> offering illegal services Are they? Torrent trackers don't host pirated content, they just let your computer find ones that *do*. That in itself isn't illegal (or at least wasn't/is a grey area in some countries). Plus, tor... | [
"url"
] | [
"url"
] | |
j6oxu3 | How do speakers make specific sounds like music come out? | Technology | explainlikeimfive | {
"a_id": [
"g7ztrtf"
],
"text": [
"It's easier to grasp if you reverse the process and understand how sounds are recorded, because playing sounds through a speaker is just reversing the recording process (more or less). To record music (or any sound) in a studio, the performer sings/plays music and the s... | [
"url"
] | [
"url"
] | |
j6pr3k | How do commercials work on live streaming services like YouTube TV? How do they stream their own commercials and how do they know the length and time to air them? | Technology | explainlikeimfive | {
"a_id": [
"g7zwahc"
],
"text": [
"From the streamer's point of view they just tell the streaming service that \"an ad break is starting now\". The streaming service or their ad middlemen then perform [automated auctions, allowing bots representing individual advertisers to bid to be shown to individual ... | [
"url"
] | [
"url"
] | |
j6q7xj | How come TV remotes are still so bad? | Technology | explainlikeimfive | {
"a_id": [
"g7zxhef",
"g7zxzcd",
"g809z85",
"g8155su",
"g80upnn",
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"g818617",
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],
"text": [
"Infrared signals from the LED bulb on the end of the remote ... | [
"url"
] | [
"url"
] | |
j6uih5 | Considering how ubiquitous and cheap 64-bit processing is, and how long 64-bit technology has existed, why is 32-bit software and hardware still a thing? | For example, Arm is [dropping support]( URL_0 ) for 32-bit in future CPU's it makes. Why now and not earlier? | Technology | explainlikeimfive | {
"a_id": [
"g80ouj4",
"g80xpfz",
"g80ozj6"
],
"text": [
"Because software from 10 years ago is still around today and can be run. It will be phased out eventually.",
"A lot of businesses like to buy something once, and use it for as long as humanly possible. Businesses will use computers, sof... | [
"url"
] | [
"url"
] |
j6wta9 | What happens during server maintenance and why does it take several hours? | Technology | explainlikeimfive | {
"a_id": [
"g813qh8",
"g81qlii"
],
"text": [
"You know how your phone or computer does updates? Think that but times a hundred. Companies try to schedule all downtime into single blocks since uptime is important. This means they're patching their systems, releasing new features, and testing to make s... | [
"url"
] | [
"url"
] | |
j6y0xn | How do the "junk mail" filters for e-mail inboxes work, and what causes them to make mistakes? | I just checked my junk mail folder, and I received a Postmaster e-mail telling me that an important business e-mail I had sent came back as undeliverable. Yet it went to the junk mail filter instead of my Inbox for some reason. & #x200B; The other week, a client e-mailed me from the normal e-mail address they always co... | Technology | explainlikeimfive | {
"a_id": [
"g81bzzo",
"g81cmcf"
],
"text": [
"The most simple spam filters are simply word-based. Those filters count the number of words that are usually in spam mails and compare that to the number of words that are usually in mails that ate not spam (aka ham). Of course, the reaction by spam mail ... | [
"url"
] | [
"url"
] |
j70826 | What made PDF format so ubiquitous/popular? | Technology | explainlikeimfive | {
"a_id": [
"g81p4v7"
],
"text": [
"Because it is simple, small, and relatively safe. a PDF can be open and read by pretty much any document editor, while something like Word Doc or google doc might have formatting issues when converting. Hell you can pretty much open a pdf as if it is a picture. Because ... | [
"url"
] | [
"url"
] | |
j73ws5 | How do people snoop in on unsecured wifi networks? | I think I understand it if someone makes a network called "Free Public wifi", and then (through the router app??) they can read what you're sending to, and from the network. But can people pick up information sent to and from the network if they did not set up the network? | Technology | explainlikeimfive | {
"a_id": [
"g82e3oy",
"g82o8vy"
],
"text": [
"Sure. If you've got a network with no password or other form of authentication, then the connection to that access point is completely unencrypted and broadcast all over the local area for anybody to grab and read right out of the air. There are even tool... | [
"url"
] | [
"url"
] |
j7a688 | If most TVs either have a 50Hz or a 100Hz Panel, shouldn't 100Hz TVs be able to Display 100FPS on say a PS5? If Not, why? | Technology | explainlikeimfive | {
"a_id": [
"g83eiue",
"g83erwt",
"g83ekhp"
],
"text": [
"It could. But the Playstation also needs to be able to calculate 100 frames per second and thats usually where the bottleneck is.",
"a 100Hz TV would be able to show you 100 frames per second. That doesn't mean that everything will sudd... | [
"url"
] | [
"url"
] | |
j7bm98 | How do usb hubs work? | How does so much bandwidth of multiple devices get carried through one? | Technology | explainlikeimfive | {
"a_id": [
"g83m0xg",
"g83xgjh"
],
"text": [
"It doesn't expand bandwidth at all. It's just a junction to allow multiple devices to share one port",
"The bandwidth gets shared between the devices. It gives each of them a different turn to speak. The turns don't have to be equal and they can chang... | [
"url"
] | [
"url"
] |
j7bsfn | What's the difference between streaming and downloading | Technology | explainlikeimfive | {
"a_id": [
"g83p48o",
"g83mxbg"
],
"text": [
"Downloading is putting water from the tap in a bucket to use later. Streaming is turning on the tap using it then turning it off.",
"Downloading saves the file to the disk. Streaming doesn't, except for temporarily in order to play the file. From a ne... | [
"url"
] | [
"url"
] | |
j7c1ms | Why does it take so long to delete software/reset devices? | My Samsung watch took like, 2min to restore itself to default for a new pairing and I was just wondering why that is. Shouldn't deleting stuff be super quick since you're getting rid of info? | Technology | explainlikeimfive | {
"a_id": [
"g83omtu"
],
"text": [
"There's two types of deleting when it comes to most digital storages. The simple one is just \"marking\" the space where the file is as deleted, think of it like you having a book that is 500 pages long and you just writing on the first page that pages 350-400 are delet... | [
"url"
] | [
"url"
] |
j7gekv | How come when you insert a credit card chip, some make you remove the card rapidly and some make you leave it inserted? | Technology | explainlikeimfive | {
"a_id": [
"g84hw88",
"g84i3em",
"g84iqr5"
],
"text": [
"If you’re being asked to keep the card inserted, it’s chip based transaction. You can’t ‘swipe’ your card’s chip. So if you’re being asked to remove the card rapidly, it’s actually just getting you to “swipe” your card’s magnetic strip at t... | [
"url"
] | [
"url"
] | |
j7hfhf | How do shipping/mail companies (USPS, FedEx, UPS...) figure out the logistics of shipping? | Is it just a computer program that figures out the quickest way to get the package to the destination? Is all of that information built in to the barcode and just gets scanned every time it hits a new place? It seems so complex with so many destinations, packages, and routes to take into account. | Technology | explainlikeimfive | {
"a_id": [
"g84n9c3"
],
"text": [
"It is super complicated. The routing information isn't in the barcode itself; the barcode is just for tracking so that the various points along the journey can check in with the \"mothership\" and say \"Where's this supposed to go next?\". Large logistics companies are ... | [
"url"
] | [
"url"
] |
j7iw9r | How do digital game sales work? We get a discount, but who ends up getting less money; the distribution platform (Steam, GOG, etc) or the actual game companies? | Technology | explainlikeimfive | {
"a_id": [
"g84wtt3",
"g84xxer"
],
"text": [
"The distribution platform (like steam) takes a portion of each item sold, regardless of the final price if it’s on sale or full price, Steam gets their part. The remainder goes to the game company. For Steam it’s generally 70/30 split. 70% to the game, 30... | [
"url"
] | [
"url"
] | |
j7lxct | How does CGI work? Do you have to draw whatever it is frame by frame? | Technology | explainlikeimfive | {
"a_id": [
"g85k717"
],
"text": [
"\"CGI\" is an incredibly broad term. It is imagery produced by computers, which can be anything from cartoon animation, 3D stills and animations, digital effects in conventional movies, and a bunch of stuff I can't think of right now. All that said typically a major ben... | [
"url"
] | [
"url"
] | |
j7mp4d | How a fingertip pulse oximeter works? | I know how it measures the pulse that's pretty simple to figure out but how can it measure my O2 sat? Can it tell by my heart rate or is there more to it? | Technology | explainlikeimfive | {
"a_id": [
"g85w47u",
"g85p5db",
"g868qx0"
],
"text": [
"Hemoglobin (the Oxygen-carrying component of blood) saturated with Oxygen lets a lot of red light pass through, and just a little infrared light to pass through. Oxygen depleted hemoglobin lets more infrared light to pass than red light. Th... | [
"url"
] | [
"url"
] |
j7n1is | Why were estimated operation times when moving files so inaccurate for computer systems | For example, if lots of files had to be transferred or downloaded from one pc to the other, it could say it would take minutes when it would take hours or visa versa. How was the computer "deciding" that it would only take a short amount of time when in reality it took a long time | Technology | explainlikeimfive | {
"a_id": [
"g85sf82",
"g85rjpz"
],
"text": [
"How long would it take you to buy 50 items from Walmart and put them in your car? You could guess and say 60 minutes, but it depends a lot on what those items are. If we're talking about 50 AA batteries, it'll take you like 5 minutes. If we're talking abo... | [
"url"
] | [
"url"
] |
j7oqzt | How a railgun functions and also Lenz’s law and Fareday’s law have to do with it? | Technology | explainlikeimfive | {
"a_id": [
"g861pj5"
],
"text": [
"Because Science did a video on this and explains better than me ( URL_0 ). However, here is a basic run down. It uses the Lorenz force for all of it. Effectively running a current through a wire will cause of a force experiences perpendicular to that wire. The force is ... | [
"url"
] | [
"url"
] |
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