Recent comments in /f/explainlikeimfive

RevaniteAnime t1_j2cmdjz wrote

A video that is very "in demand" will distributed it to data centers and "peers" across the world. Peers meaning YouTube/Google makes agreements with ISPs to host popular videos on their servers which are as close as possible the end users, this applies to pretty much all big streaming services.

Streaming doesn't require the server to send the whole video at once, it only needs to send a steady stream of little chunks of the video to each individual viewer every so often.

25

jaa101 t1_j2cmclf wrote

The brightest rainbow always has the same colour order, with red on the outside, but in ideal conditions a secondary rainbow can become visible outside the primary. The colour order of the secondary rainbow has the red on the inside, the opposite to that of the primary.

The reason for the difference is that the secondary rainbow involves the light being bent through more than 180°, i.e., it's bent back on itself.

0

sterexx t1_j2cm1f2 wrote

I can visualize the econ 101 graphs right now!

And this is almost too obvious to mention, but those computers aren’t exactly the same. They’re generally differentiated in at least some way, even if it’s just aesthetically.

But if we’re talking about precisely equivalent products, yeah economies of scale can get so interesting. My favorite is that Amazon can sell items at cost and still come out ahead.

Because they’re such a big (and reliable) customer to their vendors, they can get great terms on their invoices where they don’t have to pay for like a couple months after receiving their inventory.

So Amazon gets this $1000 TV in inventory but doesn’t have to pay yet. They sell it to me for $1000. They now have $1000 they can invest and earn interest on (or otherwise do whatever they want with) and don’t have to pay it back for a while

I don’t know exactly what scale they’re doing that at these days but it’s still amazing to me

3

sundays_sun t1_j2cln1i wrote

They can also value engineer their product "upgrades" by improving a few important specs, while installing cheaper parts elsewhere - allowing them to lower the retail price. They lower the cost of production in order to make the same profit margin despite selling the product a lower price.

2

BurnOutBrighter6 t1_j2ckcte wrote

Yes the order is always the same.

A light's colour is determined by its wavelength. "White" light, like sunlight, is a combination of all the different colours.

Rainbows happen when the suspended drops of water in the air act like prisms and refract the light. When light goes through a prism, it gets bent by an amount that depends on its wavelength. The longer the wavelength the less it is bent, the shorter the wavelength the more it is bent. That means the light gets "fanned out" according to colour. Red has the longest wavelength and gets bent the least, orange gets bent a little more, etc etc.

2

uawithsprachgefuhl t1_j2cjwm2 wrote

This! I don’t think it took people long to notice what happens to a person’s mind after a serious head injury. Babies dropped on their head didn’t fair well, but the ones who had a broken bone grew up fine. I’m sure if a person lost all their ability to communicate, express emotions or have any sort of meaningful life after a serious leg injury, people would assume the mind must be in the leg.

169