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-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.

Today we have sophisticated buoys packed with instruments and robotic underwater drones.

But more than a century ago, the seas were surveyed by different types of autonomous data-gathering instruments, which also happened to be alive.

We just call them sea otters and white sharks and blues and tuna.

Kyle Van Houten is Director of Science at the Monterey Bay Aquarium.

And what he means is that marine mammals and fish and seabirds concentrate unique chemical clues about the ocean

and what lives in it within their tissues.

In their bones, in their feathers, in their vertebrae, in their earwax.

For his most recent study, Van Houten needed to locate feathers from some long-dead birds.

Let's see. So I'm just looking here. So that was a Buller's Petrel from French Frigate Scholl.

I had the database open in front of me here.

Molly Higman, who describes herself as a librarian for dead animals at Honolulu's Bishop Museum, was able to help.

So that one was collected in May of 1891. And then we also had a brown knotty from 1895.

The scientists analyzed the ratios of heavy to light nitrogen isotopes within those old feathers,

compared to ratios in modern-day specimens.

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