Understanding the human body is a team effort. That's where the Yachtel group comes in.

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To learn more about Yachtolt, visit yawcult.co.

.jp.j. That's Y-A-K-U-L-T.C-O.J-P. When it comes to a guide for your gut, count on Yacult.

This is Scientific Americans' 60-second science. I'm Steve Merski. Got a minute?

My previous books have been specifically about topics in physics, but this time I wanted to take a step back and ask questions about how all of the different ways we have of describing the universe fit together.

Caltech theoretical physicist Sean M. Carroll. His latest book is

The Big Picture on the origins of life, meaning, and the universe itself. So some ways we

have in describing the universe are physics-centered, you know, talking about particles and forces

in quantum mechanics. But we also talk about it in terms of macroscopic things like tables and chairs,

biological things like cells and organisms, or human level things, you know, emotions and aspirations

and desires. And they're all, I strongly believe, ways of describing the same underlying stuff.

So even though you don't need to know particle physics to do

biology or psychology, your theories of biology and psychology better be compatible with particle

physics and your theories of psychology better be compatible with biology and so on. There's an

enormous amount of very exciting and challenging work to be done to both invent these different theories

and to fit them together. But I think we can see the outlines of how it will all happen.

What's what in the book I label poetic naturalism? Naturalism is the simple idea that there's

one world, the natural world. Even if there's a multiverse, we call it all a single world, there's nothing else that the universe needs.

The universe just goes on by itself. It doesn't need to be sustained or created from outside.

And the poetic aspect of it is that we should take seriously all of these different ways that we have of talking about the natural world.

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