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's 60-second science. I'm Christopher in Taliatta.

How did dogs become humans' best friend? Well, one idea is that docile wolves flock to waste dumps near human camps, but there are problems with that idea.

Because why would humans tolerate such a dangerous carnivore close to their camping sites?

Maria Latinen is an archaeologist at the Finnish Food Authority and the Natural History Museum

in Helsinki. She points out that hunter-gatherers living during the time of wolf domestication

14 to 29,000 years ago, also probably didn't stay put long enough to create generations' worth of trash.

Writing in the journal's scientific reports, she and her colleagues present a different hypothesis,

that humans purposely shared their leftovers with wolves instead.

Her team calculated the energy content of common paleolithic prey, like moose, deer, and caribou,

and they found there likely would have been more than enough meat to go around. Now, that's because

humans can't survive on protein alone, but wolves can for months. So Latinen says we might

have lobbed the leanest cuts their way. So this one we would have given to the dogs and eating the organs and bone

marrows and the other fatty parts of the animals ourselves.

In other words, the meaty, pricey bits we prize today would have been what our ancestors

threw to the dogs.

Blatinen says sharing our meat might have sparked a deeper relationship, too.

Because dogs are useful in very many ways, such as guardians,

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