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 Yachtold, visit yawcult.co.

com.j. 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 Cynthia Graber. Got a minute?

Tourists snorkeling off the Greek island of Zikynthos in 2013 thought they had made a fabulous discovery, the remains of a lost city.

They saw what appeared to be paving stones and the bases of columns in the blue water.

But when the Greek government sent in researchers,

they didn't find any other remnants of human activities such as pottery. So scientists at the

University of Athens and the University of East Anglia and England teamed up to investigate.

Julian Andrews, professor of environmental sciences at East Anglia, at first questioned his Athens

colleague, geologist Michael Stamatakis.

When I first saw the pictures, I said to Michael, are you sure they're not real?

Because they really do look like columns.

And he said, no, no, there's definitely something going on here more than that.

After analyzing the mineral content of the formations, Andrews agreed.

So what we have here is essentially the byproduct of bacterial reactions.

So they happen to look rather like human artifacts, buildings, columns, pavements,

but they're actually examples of what we call concretion, this mineral that precipitates in the sediment.

They publish their findings in the journal Marine and Petroleum Geology.

The bacteria responsible for the formations thrive near seeps, usually found in much deeper water

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