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 Suzanne Bard.

All domestic dogs belong to a single species that descended from wolves, despite vast

differences in size, appearance, behavior, and temperament among breeds. While dogs first became

domesticated tens of thousands of years ago, the breeds we know today

are largely the result of selection for certain traits by humans over the past several hundred

years. We have an enormous amount of diversity within the same species, and we can rarely

observe such diversity in nature.

So it's a wonderful system to understand how evolution works within a short period of time.

Evolutionary biologist Laszlo Garamsegi of the Institute of Ecology and Botany in Hungary.

He says that our playing with dogs is a key component of the human canine bond,

but breeds vary in their degree of playfulness. For example, a breed called the Vichla is very playful.

On the other end, the Chivawa doesn't like to play at all. Of course, you can train a little bit,

but the average level of playfulness

will be always lower than in the Hungarian vigil. Garam Saki and his colleagues

analyzed the playfulness of more than 89,000 purebred dogs across 132 breeds, from

Pomeranians to Great Danes. The dogs were all given a test measuring their degree of enthusiasm for a

game of tug-of-war with people. We were interested in whether breeds could be distinguished by their

...