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.

.jp. 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 60 Second Science. I'm Aline Ogenbron.

Dogs were the first animals to be domesticated, and they stuck with us as we changed lifestyles,

from hunting, gathering, to farming, to city living.

The dog is a species that is intimately linked to human history.

Anders Bergstrom, a postdoc at the Francis Crick Institute in London.

He and his colleagues studied the genomes of 27 ancient dog bones dug up around the world.

They found that by 11,000 years ago...

We see that the dog started to diversify genetically,

so we find evidence of at least five major lineages of dogs already at this time.

Dog remains have been found in Europe, Asia, and the Americas, in a pattern similar to how

humans moved and mixed. To a large degree, the history of dogs seems to have been shaped

by human history, so likely reflecting how when humans moved, they would have brought her dogs with them.

Ancient humans clearly found dogs to be very useful.

In the Arctic, there's evidence that sled dogs actually emerged very early,

and people use them for the particular purpose of sledding, perhaps as early as 10,000 years ago.

A few modern breeds like the African

Bessengi, New Guinea singing dog or Australian dingo are similar to one of the five ancient

...