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Explain Like I'm Five is the best forum and archive on the internet for layperson-friendly explanations.

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  • Make sure to read the rules!

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  • LI5 means friendly, simplified and layperson-accessible explanations - not responses aimed at literal five-year-olds.

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/r/explainlikeimfive

22,963,412 Subscribers

2

ELI5: What technology is used to find earthquake victims trapped under rubble?

2 Comments
2024/12/07
02:38 UTC

0

ELI5%3A%20Is this happening because of some sort of refraction with the sun so low in the sky?

I tried it on either side of me, high and low, and it still did that. This was about 3:45 in the afternoon when the sun sets at like 5:15.

1 Comment
2024/12/07
02:34 UTC

5

ELI5 why is it so hard to find information about phone numbers online

Like the title reads, why can't the public reverse-Google an unknown phone caller's number and actually get good search results or an indication of scammer/ sales/ first time caller? Please ELI5.

8 Comments
2024/12/07
02:33 UTC

2

ELI5: How a strata scheme works.

0 Comments
2024/12/07
02:22 UTC

18

ELI5: Why is stool specifically liquid/loose/diarrheal when someone is enduring a bacterial infection?

This is applicable to viral and parasitic infections too I suppose. The body needs to expel the pathogen, but why can't that be done with solid stool? Why does it require the stool to be liquid? Why does the pathogen change the normal consistency of stool from solid to liquid, and what expulsion property does solid stool lack that doesn't make it the natural mechanism for excreting the pathogen?

12 Comments
2024/12/07
01:19 UTC

6

ELI5: How exactly did “spike” ice crystals form?

There was heavy fog this morning with below freezing temperatures. All of the trees looked like they had spikes on them (all made out of ice). How did they form so perfectly? Here’s a picture

3 Comments
2024/12/07
00:16 UTC

194

ELI5: How do people lose all their savings by doing options trading?

How do people lose all their savings by doing options trading?

I've looked up options, but don't really understand it. How do you see people losing their entire account doing it, how do you avoid that (other than not doing options), and why do people call it gambling?

252 Comments
2024/12/06
23:57 UTC

22

ELI5 How does clothing with insulation (like wool) keep you warm and cool?

I read that wool can simultaneously keep you warm but be breathable and keep you cooler when its hot. How on earth does that work if your body temp is about the same regardless of how hot or cold the outside is?

2 Comments
2024/12/06
23:38 UTC

21

ELI5: What Exactly Is Instinct?

What IS instinct? What exactly gives certain organisms the sense to do something? Like for example, the cuckoo bird. a cuckoo bird could be a literal BABY and just born, yet it has the instinct to push the other eggs out of the nest. (I apologize for my english or if I used the wrong words)

4 Comments
2024/12/06
21:43 UTC

0

ELI5 - Time relativity - to go to the future

I want to visit my grandkids grandkids grandkids. It's my understanding that the closer you get to the speed of light the slower time moves for me while it stays the same from everyone else's perspective.

Is it theoretically possible then to travel on a near light speed vehicle and come back hundreds of years in the future for Earth?

It seems like that shouldn't be possible. I think in terms of time zones where if I'm flying across the world, it may only be 8 hours to me but I'm now ahead from my original destination by say 8+10 hours. When I fly back that time change has vanished. I'm sure that understanding is flawed as we move to subjects like huge gravitational forces and incredible speeds from great distances but I would love to better understand Einstein's theory.

12 Comments
2024/12/06
20:56 UTC

0

ELI5: How exactly is TikTok a national security risk, and is it that dangerous?

An appeals court today ruled TikTok can be banned. Somehow I don't think it's any more dangerous than any other Social Media program or web browser that scrapes our data. What makes TikTok so extra dangerous it's considered a national security risk? Am I missing something, since over 175 million Americans use it?

43 Comments
2024/12/06
20:14 UTC

42

ELI5: do wooden or bamboo made flutes ever lose their tune? If so, is it fixable?

6 Comments
2024/12/06
19:39 UTC

2

ELI5 how do radiator valves work?

I was under the impression that closing the valve should turn the heat off, but instead I just get hot periods and cold periods. Why isn't the heat off all the time when the valve is closed? Does it really have to be fully open or fully closed? How does it actually work?

Thank you

ETA: radiators to heat a house, not in a car, and these have manual valves.

6 Comments
2024/12/06
19:28 UTC

3

ELI5: How does my kWh get calculated with my solar panels?

I have an array of solar panels on my roof. How does my electricity get calculated. For an example.

November I was billed for 650 kWh by my electric company. Solar said I generated 250 kWh

Did I ultimately consume 900 kWh for the month of November?

14 Comments
2024/12/06
19:11 UTC

14

ELI5 how does surround sound work in video games?

I was replaying Mass Effect and noticed how depending on how you face you can hear the news. How does it know whether to play out of the right, left, or both speakers?

11 Comments
2024/12/06
18:29 UTC

117

ELI5: Why do a lot of planes have more seats than room for carry-on baggage?

If everyone is allowed one carry-on and one personal item, why is it some times the last people in line have to have their carry on bags checked?

113 Comments
2024/12/06
17:11 UTC

0

ELI5 - Encryption: Why sign public keys with your own private key

In PGP why do you sign a person's public key and what does their "Trust" level mean?

7 Comments
2024/12/06
16:37 UTC

0

ELi5: What's the impact of the ozone hole and the resulting ultraviolet radiation on penguins? Do they get more skin cancer?

4 Comments
2024/12/06
16:06 UTC

2,346

ELI5 Why aren’t ballet shoes just made better instead of ballerinas being forced to destroy them?

I always see videos of ballet dancers destroying their shoes. Which I understand is because they are modifying them to make them better to dance in and more comfortable, supportive, etc. but then they say that the shoes don't last them very long anyway. I guess I'm just confused why better ballet shoes aren't produced that don't need all of that modifying? It seems like that would be less wasteful and better long term?

286 Comments
2024/12/06
15:48 UTC

625

ELI5: why was Germany allowed to raise an army after WW2 but not Japan?

126 Comments
2024/12/06
15:44 UTC

3

Eli5: how can so many different looking games be made in the Unity engine?

I see 2d platformers, strategy games, first person shooters and more with the same "made in unity" logo in the corner. How does this work? What exactly is unity?

13 Comments
2024/12/06
15:18 UTC

15

ELI5: What exactly is a “terministic screen”?

From my understanding, a terministic screen happens when it’s impossible to describe all aspects of an object using just one word, so whatever term you come up with for it will leave out some aspects and emphasize others.

Here’s my example of what I think a terministic screen is:

You have a character who’s a pink elephant with ice powers and a brave personality, and you need to come up with a name for them. Do you name them Pinkers, Trunky, Frosty or Courage?

Would my understanding, and the example, be correct?

5 Comments
2024/12/06
13:59 UTC

0

ELI5: Why do countries drive on the left side of the road and some on the right, and use different seats for the driver?

42 Comments
2024/12/06
12:45 UTC

3

ELI5 Since when do people know what the compound molecule of every material looks like and what where the methods to achieve this?

2 Comments
2024/12/06
12:37 UTC

296

ELI5: How do games that have AFK systems work?

Like cookie clicker for example. How does it still play the game even after I closed out of it?

40 Comments
2024/12/06
11:08 UTC

97

ELI5: how does health insurance work in the United States?

272 Comments
2024/12/06
11:01 UTC

74

ELI5: How does data persist in hard drives and storage devices even after we turn off the power?

I know that at a grass-roots level, data is represented using binary, where 1 means 5V and 0 means 0V. But this 5V must come from somewhere, right? If I turn my laptop on, the battery must be creating this potential difference. But if I turn my laptop off i.e. no power goes through the battery, shouldn't all the bits reset to 0 and all data is permanently lost? Thanks in advance

43 Comments
2024/12/06
10:11 UTC

0

ELI5 What is “Digital Ink and Paint” and how does it work in the animation industry?

2 Comments
2024/12/06
07:44 UTC

0

ELI5: What is the purpose of practicing?

I would like to better understand what someone is trying to accomplish when practicing. Whether that's singing, instruments, sports, etc.

What do you go into the practice trying to accomplish that day? Do you just try to do it over and over again? And if so, how does that help you?

How do these small practices contribute to larger improvements?

Please explain like I'm five.

18 Comments
2024/12/06
06:25 UTC

508

ELI5: What exactly is the difference between a green screen, blue screen, and red screen when it comes to filmmaking?

77 Comments
2024/12/06
05:48 UTC

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