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.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 American 60-second science. I'm Julia Rosen. Got a minute?

The city of Tannis was consumed by the desert in the sandstorm which lasted a whole year, wiped clean by the wrath of God.

Indiana Jones's friend Marcus Brody, explaining the fictional fate of the city of Tannis in Raiders of the Lost Ark.

Back in real life, scientists have found something else covered by the Sahara's Sea of Sand,

an ancient river system. The remains of the main channel, which dried up long ago,

wind beneath the West African desert for more than 300 miles before reaching the Atlantic Ocean.

Researchers led by Charlotte Sconezny of the University of

Leal in France uncovered the system using a kind of satellite-borne radar that can penetrate through

several feet of dry surface sediments like sand. The scientists think that the network may extend even

farther inland, but thick dunes prevented them from mapping it. They report their findings

in the journal Nature Communications. The discovery appears to solve the mystery of what created a

vast underwater canyon off the coast of Mauritania in northwest Africa. The subsurface ravine

looks like those that form at the mouths of massive rivers today, but researchers had only

hypothesized the existence of major waterways

in West Africa until now. The fact that rivers once raged in this region sheds light on the

Sahara's tumultuous history. Scientists know that this vast desert wasn't always dry. At certain times

in the past, it boasted green grasslands teeming with life. The researchers think the Sahara's Lost River last flowed 6,500 years ago,

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