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

Researchers at Yachtolt have been delving into the secrets of probiotics for 90 years.

Yacold also partners with nature portfolio to advance gut microbiome science through the global grants for gut health, an investigator-led research program.

To learn more about Yachtolt, visit yawcult.co.

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

This is Scientific American's 60 Second Science. I'm Christopher in Taliatta.

Charles Darwin is most famously the author of The Origin of Species.

But the last book he ever wrote gets far less attention today.

It's called The Formation of Vegetable Mold Through the Action of Worms.

And earthworms were a passion.

He wrote about their habits, their soil-tilling abilities.

He even kept pots of worm-filled soil in his study. But his fascination was met with ridicule by some.

There's a famous cartoon where, you know, Charles Darwin as an old man is in the middle, and he evolves from monkeys because of his evolutionary theories,

and the monkeys evolve from earthworms.

Olaf Schmidt is a soil ecologist at University College Dublin, and not among those who would

criticize Darwin for his interests.

I love earthworms.

Yeah, earthworms are brilliant.

They're our friends.

They're really important.

One particularly interesting group of worms, he says, are the so-called anisic worms, the deep soil dwellers. And they live all their life in a single vertical channel in the soil, and at night they surface.

Looking for food, manure, straw, stuff like that.

...