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.j.j.

That's y-A-K-U-L-T dot-C-O-J-P.

When it comes to a guide for your gut, count on Yacolt.

This is Scientific American 60-second science.

I'm Christopher in Dallata. Got a minute?

Ever run along wet sand and it hardens up almost like concrete under your feet?

But pick up that same sand and it drizzles through your fingers.

So that's the essence of why granular materials are interesting.

Yale physicist Abe Clark.

Sometimes they can behave like solids.

And other times, like fluids.

Understanding the transitions between liquid and solid?

That's really non-trivial.

Grains, of sand or otherwise, are Clark's specialty.

He and his colleagues recently investigated how a bucket of beads responds when another object

falls into them. It's analogous to dropping a stone on sand,

and then observing how the stone's force transfers to the grains.

The top grain is contacted by the intruder,

and then it tells a friend and it tells a friend and so forth,

...