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.

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

This is Scientific American 60-second science. I'm Emily Schweng.

Sex. It drives people to do crazy things. Animals, too. They'll make unsettling sounds, perform complex dances, or show off giant plumes of colorful feathers.

And famously, salmon will swim hundreds of kilometers upstream to get down to

business. They also inadvertently rework the landscape. Adult salmon spend most of their life out in the

ocean and then they come in to freshwater to mate. Washington State University ecologist Alex Vermeer.

What the female salmon will do is she digs a hole in the stream bed.

That little hole is called a red.

That's where the salmon lays her eggs.

And Vermeer says when she builds it, she basically unpacks the stream bed, making all those loose sands and gravels more mobile.

High water and flooding events

move that sediment, which in turn exposes bedrock to further erosion. It's quite impressive.

We did not expect to have salmon in some cases changing the vertical position of a river channel

up to 30% more than it would have without salmon in it.

Vermeer hypothesized that salmon not only influenced landscape evolution,

but that the evolution of salmon as a species itself has a landscape level impact.

To test the idea, he and colleagues recreated salmon reds in an experimental

flume. Then they compared findings from the flume with real field observations. They cross-referenced

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