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 Yacolt.

This is Scientific American 60-second science. I'm Christopher Ndallata.

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Every day, the largest mass migration on the planet happens, in the world's oceans.

Tiny fish, jellies, and shrimpy things feed at the water's surface by night.

And by day, they hide in darker waters a few hundred meters below.

The ocean is a dangerous place, and so swimming down to depth is your best bet to avoid predators.

Danielle E. Bianchi, an oceanographer at the University of Washington.

Bianchi and his team tracked these ocean migrations with sonar data,

and they found that the creatures descend to areas of deep water

where certain species of bacteria hang out. Those bacteria snack on nutrients that float down from

the surface, so-called marine snow. But Bianchi says the migrating creatures may also deliver

food to the bacteria in the form of ammonia in the creature's urine. The bacteria metabolized the

ammonia to produce energy in nitrogen gas, effectively removing the nitrogen from the food chain

and sending it in gaseous form back into the atmosphere. Then other bacteria fix that nitrogen

gas back into food chains, on land and in the ocean, where it eventually finds its way into

amino acids, some of which make up the proteins in us. The findings appear in the proceedings

of the National Academy of Sciences. There are about 20 times more of these tiny fish than

...