One of my favorite parts about the subject of time is that there are so many, well, parts.

Of course, I just did a whole episode on why we think time has an arrow.

Well, at least it was an episode on our best idea that everybody

none of the less agrees isn't all that fantastic.

And how we think time is sort of somehow maybe in a vague sense connected to the concept

of entropy.

And entropy comes from thermodynamics, which is the study of hot things like heat pumps and steam engines and work and all that stuff.

But thermodynamics, or if you want to be super precise, super jargony and nerdy about it, statistical mechanics isn't the only lens through which we view nature.

All of physics isn't inside of thermodynamics.

A part, a very important part,

a part of nature is described by our laws of thermodynamics,

and by the way, we need an episode just on that,

so feel free to ask any time. But thermodynamics isn And by the way, we need an episode just on that. So feel free to ask any time.

But thermodynamics isn't the whole story of any system. It's like, it's like your senses.

All right, we have, we have different kinds of physics that we use to understand the world

around us. And just like you have different senses that you use to understand the world around us. And just like you have different senses that you use to

understand the world around us. And sometimes you just need your sight. Sometimes you just need

your sense of smell or touch. But usually you need all of them in combination to get a full, well, picture of the world. And so it's like

that in physics. Like sometimes we only need to care about thermodynamics and we can ignore anything

else. Sometimes we just need to care about special relativity. Sometimes it's just high energy

interactions, you know, et cetera, et cetera, et cetera, But most of the time we need multiple inputs from multiple different kinds of physics

in order to get a sense of what something in nature is doing.

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