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 dot C-O.J-P. When it comes to a guide for your gut, count on Yacult.

This is Scientific American 60-second science. I'm Emily Schweng.

More than 900 years ago, the Pueblo people were thriving in New Mexico's Chaco Canyon.

While they were there, the region experienced what the whole country is looking forward to on August 21st, a total solar eclipse.

Theirs took place in the year 1097, and they may have left a record of the event.

I spotted this very peculiar petroglyph, which was a round object.

Kim Malville is a retired solar astronomer from the University of Colorado Boulder.

In 1992, he and colleagues were leading a field course in Chaco Canyon when he noticed a

unique carving on the south side of a rock.

Which was a round object with loops coming out of it.

And it struck me as maybe this was a image of the sun with the corona in a very active state.

And maybe at that time there was what is known as a coronal mass ejection. That's when a giant cloud of plasma spirals off the sun's surface

because of a solar flare. It was somewhat foolhardy, I suppose, on our part to suggest a particular

explanation for it. But Malville knew that he had a testable hypothesis.

Astronomers know that the region had a total solar eclipse on July 11, 1097.

During the brief darkness, the sun's corona would have been visible.

Solar activity increases and decreases on a roughly 11-year cycle,

so Malville used various historic records to find out what was happening in 1097.

...