Recent comments in /f/explainlikeimfive

sterlingphoenix t1_iucq25n wrote

Yup, they're fast and can run long distances, well, fast. Humans aren't as fast but can run for longer. This is the point; we're not the fastest species, but we can run for longer than any other. An ostrich will get tired before a human.

Now we're not talking about a you-an-me human. We're talking hunter-gatherer humans.

1

blow_up_the_outside t1_iucpflc wrote

This has a pretty interesting answer I think!

It is because of our brains and language.

You see, colors do not actually exist. What we perceive as colors are just different wavelengths of light.

We don't have to go into what wavelengths are, just see them as a quality light has that can differ.

Eyes evolved to see a certain spectrum of light. That means a certain slice of all wavelengths light can have, the rest is invisible to us; like radio waves or x-rays!

The human brain evolved to divide this visible light so we can make out subtle differences, most likely like seeing a tiger in the grass, this is the sensation of color.

So actually, rainbows are just a gradient of wavelengths, but we perceive that as individual colors.

But the weird thing is, just how individual they are perceived to be seems to be closely linked to language.

Some languages only have three words for all colors: red, black and white. What seems like blue to you, a native speaker of that language might say is black. What you say is purple they might say is red.

Some languages have four colors and so on.

English, not counting hues, generally has 6 main colors. Red, orange, yellow, green, blue, (indigo), violet. Does that ring a bell?

That's the colors the rainbow is said to have in English (and many other languages). Isn't it strange and kind of awesome?

161

ohromantics t1_iucosc2 wrote

Would you please translate the image of the invisible by thrice? The first 15 seconds or so are Morse. I want to use this as a template to break down exactly what you're explaining for a litany of other Morse amongst. Thanks in advance.

Edit: image*

5

hasdigs t1_iucne2p wrote

Because it would take to long. Let's say you have a gobstopper and you want to disolve it in acid. You could put it in acid but the acid is only contacting the out side layer. Once the outside layer is dissolved then it can start on the next one, then the next one. But if I smash the gobstopper into dust then put it into acid now the acid is in contact with all of it at the same time. Chewing also mixes saliva through the food which aids in digestion.the stomach also churns the food to help mechanically break it up but it isn't very good compared to chewing so if you didn't chew anything you are making more work for your stomach.

6

LittleMetalHorse t1_iucn5qu wrote

Used in IR signal flashes in my personal experience, very useful low tech IFF.

Also, as a pilot in East UK where there are (were?) Lots of airfields, a flashing ident beacon you could see from 10k out made it easier not to land at the wrong runway...

2

EspritFort t1_iucn4om wrote

>what is the point of chewing food thoroughly if your stomach will digest everything anyway?

Your food having been chewed thoroughly is a requirement for it to be digested properly. Otherwise all the enzymes and carrier fluids involved in the digestion process have no surface area to attack. In that case the food will be excreted undigested.

24

LittleMetalHorse t1_iucmw4x wrote

I was in the last course in the British army to learn morse code. As a signaller, I had to pass a test at 8wpm (nothing by cold war standards, but pretty hard work for a beginner).

I spent 6 months listening to cassettes and practicing (and eventually passing the test) in the certain knowledge that I would never ever use Morse anywhere as the army had stopped using it. My own little Yossarian moment.

10

explainlikeimfive-ModTeam t1_iuclyo9 wrote

Your submission has been removed for the following reason(s):

ELI5 does not allow guessing.

Although we recognize many guesses are made in good faith, if you aren’t sure how to explain please don't just guess. The entire comment should not be an educated guess, but if you have an educated guess about a portion of the topic please make it explicitly clear that you do not know absolutely, and clarify which parts of the explanation you're sure of (Rule 8).

If you would like this removal reviewed, please read the detailed rules first. **If you believe it was removed erroneously, explain why using this form and we will review your submission.

1