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.

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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 Yacolt.

This is Scientific American's 60-second science. I'm Christopher in Taliatta.

Not many scientific studies begin like this.

Many hours of watching YouTube clips, trying to find as many yawns as possible.

But for Andrew Gallup, an evolutionary psychologist who studies yawning at the State University of New York,

it was all in a day's work.

Gallup says yawns have traditionally been known as a sign of sleepiness or boredom.

A recent evidence suggests that yawning may function to promote brain cooling.

The idea being, when you breathe in deeply, the incoming air slightly cools the brain.

And stretching the jaw increases blood flow to the brain too,

another cooling factor. The reason we do it at night? At nighttime, when we're about to go to sleep,

our brain and body temperatures are at their highest point during the day, and that's when we see

highest frequency of yawning. And so, Gallup and his colleagues found themselves hunting for cat

videos on the internet,

along with clips of dogs, foxes, elephants, gorillas, hedgehogs, squirrels, rats, even walruses

yawning.

They timed all those yawns and then compared them to each species average brain weight

and the number of neurons in the cerebral cortex.

...