Recent comments in /f/explainlikeimfive

Gnonthgol t1_j2dbn37 wrote

The circadian rhythm is driven by a hormone called melatonin. When we have little melatonin we are awake but also start producing melatonin. When we have a lot of melatonin we get tired but also start breaking down the melatonin. If left completely alone this rhythm will repeat itself roughly every 24 hour. In some people less but in most people more. But things like light and meals will cause the melatonin levels to go down in order to tune the circadian rhythm to an even 24 hours which matches the day and night cycle.

In addition to the circadian rhythm the entire brain does not fall asleep. Part of your brain never sleeps and is able to wake up other parts on demand. This is how we have been able to stay alive for millions of years without getting eaten by predators or taken by landslides even though we need sleep every night. So even when sleeping you are constantly listening out for cues that it is time to get up and might even open your eyelids to scan the environment before falling back asleep. This means that things like a clock in the room, the sound of garbage men outside, light through the window, the neighbors alarm clock, etc. can cue your brain onto the idea that it is now time to wake up.

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DomesticApe23 t1_j2dblzn wrote

Determining whether a comment is generated by an AI can be difficult. AI generated text has become more and more realistic with the advance of new technologies.

One way to identify an AI generated comment is to notice the structure of AI generated comments. They will typically restate the question or provide an introductory paragraph before going on to present statements in a high school essay format.

Another way to identify AI generated comments is to check the comment history of the person posting the comment. Profiles that post AI generated comments will comment on multiple posts in subreddits which ask and answer questions, often on very diverse topics. You might also notice a sudden change in the syntax of their comments over time.

In conclusion, look for comments that have a clear beginning and middle, and that end with a conclusion.

Or just be me, and recognise the shitty text on sight.

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21_MushroomCupcakes t1_j2dbe16 wrote

They keep the gains, we share the losses.

They'll squeal when tax season comes, you and I will pick up the tab on whatever losses they feel entitled to.

When they get rich we get poorer, and when they don't we still get poorer.

Even philosophically, we gain nothing.

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PlatzhirschDe t1_j2dazip wrote

Before civilization it was just important to be up in time - you needed to wake up in time to use what daylight hours you had. The specific time of the day wasn't as important - sure, you needed to know to some degree how late it was to plan your day, but before civilization there was simply almost no need to meet someone at a specific time when people were living in small tribes.

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Blautopf t1_j2daxvc wrote

In the end you could ask where the line should be drawn between a political party and a religion, as orginised religion was invented to bring governance through the fear of god when we had simple and very uneducated societies and is used now as a way to impose the will of the few on the many.

Belief in a higher power and religion are often confused, but as the quote from The big bang theories Amy goes roughly "I don't object to the concept of a deity, but I'm baffled by the notion of one that takes attendance"

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TheMan5991 t1_j2dasck wrote

> The zero gravity is only possible in orbit where the forces cancel out.

Zero gravity is not possible anywhere. Zero Gs, on the other hand, is possible almost anywhere. Orbit is just the best place to experience zero Gs for any significant amount of time.

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DanielEnots t1_j2daq3s wrote

Basically, if you're hearing 1hz sound then once per second the sounds wave goes up and down for a full cycle. To "cancel" it you play a sound that goes down and then up so that you get +1 from outside and -1 front the headphones. And you end up with 0 when you add them.

It's like how I gimbal moves the camera in the opposite direction so even though the person holding it is moving when you add the gimbal movement the camera stays still. There's effectively no sound from outside hitting your ear drum (in a perfect world where it is 100%)

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Gnonthgol t1_j2daozg wrote

The first thing scientists did when hot air balloons were invented was to fly as high as they could to record the pressures and temperatures. Some almost died from the lack of oxygen and low temperatures. If you continued the graph of pressure at various altitudes you would see that there were indeed very little atmosphere in space, almost non-existant. This was confirmed by theories of pressure and gravity that had been developed using heavier fluids in labratories.

And when modern artillery was developed a bit over hundred years ago the shells were flying high enough that the reduced pressure was very significant. You could say we fired cannon shells into space and had to calculate their trajectory through vacuum. This provided us with even further insight into how the upper atmosphere behaved and the exact low pressures there.

When it comes to gravity there is actually plenty of gravity in low Earth orbit. But it is not gravity itself you feel. You feel the force pushing up from the ground countering gravity. If there is no forces acting on you we say you are weightless and in free fall. When you are in free fall you do not feel the effects of gravity on your body and your surounding things. The ground is just approaching you at an alarming rate.

This is the case with astronauts as well, there is nothing pushing them so they are weightless in free fall. The reason they do not hit the ground is that they are moving very fast sideways and is therefore able to miss the Earth as they fall towards it. And once they missed the Earth and is on the other side they will fall towards the Earth from the other side but still have the high speed so they miss again.

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[deleted] t1_j2da9x9 wrote

Yes, you are right. That's what I'm trying to tell in a simple way. And I haven't said that there isn't a thing like mind. I just said don't try to see it in a physical way...like your software example, it does not physically exist but it involves with other physical parts and it's an essential thing to function properly. Same matter for mind.

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ringoron9 t1_j2d9p99 wrote

Just climbing a mountain already tells you that pressure goes down. The rate at which this happens depends on altitude, we could calculate that far above there is practically no air, and therefor no oxygen.

Gravity was pretty well understood by then, so we know how strong gravity in space is. Also, it's a common misconception that there is no gravity in space. At the altitude of the ISS, Earths gravity still is about 98% of sea level gravity. The zero gravity is only possible in orbit where the forces cancel out.

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Pocok5 t1_j2d9l01 wrote

https://en.m.wikipedia.org/wiki/Sherman%27s_March_to_the_Sea

https://en.m.wikipedia.org/wiki/Yugoslav_Wars

https://www.reddit.com/r/europe/comments/spf1zl/the_ruins_of_grozny_chechnya_after_it_was/

Depending on the country, nothing stops people from declaring anything. Trying to actually act on it however tends to invite a lot of dudes with guns and explosives to help your body parts declare independence from each other.

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drlecompte t1_j2d9jez wrote

I'd like to add the clarification that color is how our brain interprets light's wavelength. So 'blue' and 'short wavelength' mean the same thing, when talking about light.

The laser in a DVD or Blu-ray drive is used as a 'needle' to detect small pits on the disk, which encode 1s and 0s. A red laser has a long wavelength and is akin to a fairly blunt needle. It won't detect very small pits, so the pits in the disk need to be fairly large. Which limits the storage capacity of the disk.

With a blue laser, which is a much finer 'needle', the pits can be a lot smaller, so a lot more data can be stored on the disk.

There are also other factors like how fast the disk spins, and how close the pits can be to eachother. The accuracy of electronics manufacturing has improved since the advent of dvd's, so we can now make smaller devices with fewer chances of important errors. How efficiently the data on the disk can be compressed has also evolved substantially since the advent of DVD, further increasing the amount of video a disk can hold.

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