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.

Yachtold 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.j. That's y-A-K-U-L-T.C-O.J-P. When it comes to a guide for your gut, count on Yacult.

Actually seeing migration is tough, right? I didn't see migration, but I heard it that night.

And that I'll always stay with me.

There's no denying it.

We humans largely operate under the light of the sun.

But as the sun sets and we go to bed, another shift begins. While we sleep,

depending on the time of the year, the skies come alive and they have a story to tell. Are you

ready to listen? I'm Jacob Job and you're listening to Scientific Americans Science Quickly. American science quickly.

Each spring, billions of migratory birds take wing in an annual ritual that carries them from their wintering grounds to their breeding grounds.

Come fall, adult birds with offspring reverse course and head back to their winter homes.

Birds have been migrating for at least hundreds of thousands of years.

Our understanding of this phenomenon is relatively recent, however.

Early speculation suggested that the seasonal exodus of birds was best explained by some

pretty far out there hypotheses.

Dating back to at least the 11th century was the idea that some geese temporarily transformed themselves

into barnacles that clung to the sides of ships. A 16th century Swedish priest hypothesized

that some birds dove down underwater only to pass the winter in the relatively warm mud at the

bottom of lakes. A century later, another member of the clergy even suggested that birds escape the cold of winter

...