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.

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To learn more about Yachtolt, visit yawcult.co.

.j.p. 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 American's 60-second science. I'm Christopher Entagata.

Got a minute?

In 1982, the ground beneath the Italian port town of Pozoli, near Naples, began to swell.

In the next two years, the town rose more than six feet.

Rocks underground cracked under the strain, sparking tiny earthquakes, and some 40,000 residents

were forced to evacuate.

Tiziana Vanorio was one of them.

We were scared, not because of the earthquakes, but because the fear that an eruption was about

to come.

But that eruption never came.

And Vanorio, who's now a geophysicist at Stanford University,

wanted to find out how the rock endured the strain. So she and a postdoctoral student obtained rock

course from the Campi-flagre caldera, the volcanic area underlying Potswoli, taken just before

the swelling in 1982. They discovered a layer of what's called

Caprock, almost like a lid, that sealed off the caldera below. And the Caprock's microstructure

was an intricate network of mineral fibers, the key, she says, to its strength and ability

to flex under pressure.

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