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 Yacolt.

This is Scientific Americans' 60-second science.

I'm David Biela. Got a minute?

Chestnut trees once carpeted the eastern U.S.

Three billion of them fed and sheltered many forest residents.

Until the early decades of the 20th century when a fungal disease called chestnut blight

killed almost every last one of the trees.

But now the American chestnut is making a comeback in its

former range, thanks to genetic modification. The blight came to the U.S. on imported Asian chestnuts,

which are resistant to the disease. With that resistance in mind, in the 1980s, the American

Chestnut Foundation began working to crossbreed the Asian chestnut with

surviving individuals of its American cousin. Such crossbreeding is time-consuming, however,

and results in something less than a full American chestnut. In a bid to speed up restoration work

and minimize the need for genetic changes, scientists at SUNY College of Environmental Science and Forestry have introduced

genes into the American chestnut from wheat that helped disarm the fungus. And in future,

genes from its Chinese cousin, other trees and even grapes could help make the American chestnut

even more resistant to the deadly blight. A few of the hybrid chestnuts have been planted in the

...