Recent comments in /f/explainlikeimfive

michal_hanu_la t1_j6onuon wrote

IP addresses are numbers, each 32 bits long.

A subnet of a given prefix length is a set of addresses for which the first prefix length bits are the same.

So 10.0.0.0/16 means all addresses where the first 16 bits are 00001010 (10) 00000000 (0).

If you wanted a set of addresses with the first 24 bits the same as 10.0.0.64, that would give you all addresses between 10.0.0.0 and 10.0.0.255 (inclusive), which we conventionally call 10.0.0.0/24.

But you already gave 64 of those addresses to someone, so you need to find 256 addreses all with the same first 24 bits and that is 10.0.1.0/24.

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Ok_Morning3588 t1_j6omwj9 wrote

IIRC, hemp was farmed enormously in the US around the early 1900s. Rayon, developed by Dupont, was becoming commercially successful and the Duponts (along with the Hearsts who owned much of the news and advertising outlets) launched campaigns agains hemp and in favor of Rayon. So the entire hemp plant, along with the tetrahydrocannabinol-containing cannabis, were illegalized.

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confuseray t1_j6omglg wrote

As if you're 5??

Ok I'll try. All of us are always moving, even if we think we are standing still. You see, even if you stand as still as you can, time still passes for you. You're still moving through time.

Scientists have determined that this stuff we move around in, this...space, this reality it's actually part of the same stuff as time. We can call it spacetime.

Now, there is a max speed you can move through spacetime. We don't really know why, it's just a rule of the universe. If you stand as still as possible, you move through time as fast as you can. 1 second a second. If you start moving though, you increase your...spacespeed. You start subtracting from your timespeed.

Now the way the conversion ratio works, if you're moving as you normally do, you don't really slow down moving through time much. You have to move really really fast, like light speed fast, to have a significant effect on your timespeed. And as you get closer and closer to lightspeed, your timespeed gets closer and closer to zero, because you're taking that travelling speed away from time and putting it into spacespeed.

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ToxiClay t1_j6ombz8 wrote

This very quickly runs into a whole mess of politics, but the very short form is that, as it stands, Facebook can decide all by itself that you no longer get to speak on their platform -- they can ban you, they can restrict your ability to post, etc.

The considered motion would say "Facebook, you can't do that anymore, unless we say you can/order you to."

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czbz t1_j6om9o0 wrote

I wouldn't say "Reddit reads Sam" is semantically meaningless. It can mean the Reddit community forms an understanding of who Sam is, or just that they read words Sam wrote, depending on context.

I would say the rule has been broken if the speaker intended to communicate that Sam was the one reading but they said the words in the wrong order, perhaps because they didn't know English grammar well. It's a particularly bad mistake because it may lead to a misunderstanding.

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DoctorKokktor t1_j6om43l wrote

Thank you for your kind words :)

Incidentally, Einstein's theory of special and general relativity are also a different kind of geometry! Just like how Euclidean geometry takes place in Euclidean space, special relativity takes place on what's known as "Minkowski" space or spacetime, whereas general relativity takes place on what's known as a pseudo-Riemannian manifold.

These words sound complex but just remember that they are merely names for some kind of foreign geometry that are derived from a completely different set of axioms than the normal Euclidean geometry that we studied in high school. This article is very nice at introducing the history and context behind non-euclidean geometries!

But you don't even have to think about something as abstract as relativity to realize that non-euclidean geometries are everywhere. Even the surface of the earth has a non-euclidean geometry (the geometry that takes place on the surface of the earth is called "spherical geometry"). In this sort of geometry, you can have triangles which can have two right angles!

The reason I am introducing all these different types of geometries is because in the end, relativity theory is a geometric theory of spacetime. If you can understand the context behind some of the different kinds of geometries, then you can understand the context behind relativity theory as well! In this way, relativity won't seem as mysterious anymore. It's still very counter-intuitive, but at least you can understand that relativity is just a consequence of choosing some set of axioms, and drawing conclusions from there, just like any other sort of non-euclidean geometry.

Sorry for all these other links haha. This topic is extremely interesting to me and I wanted to share some resources to hopefully get you excited about it too! :)

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