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.j. 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.

Deep in the Amazon lives one of the world's largest freshwater fish, the legendary Arapima.

It tips the scales at hundreds of pounds, making it a coveted catch for extreme anglers,

like Jeremy Wade from the show River Monsters.

That's a fish. That's a good fish.

After a dramatically scored struggle, he catches one,

and it takes two guys to hold it up.

There it is.

Look at that for a fish.

Look at that.

Massive female aripimer, about 150 pounds.

Speaking of scales, this giant fish has another superlative quality.

It has these very impressive armor scales on its body, which prevent penetration by

predators' teeth, yet it still makes the fish quite flexible and nimble in the water.

Robert Ritchie, a material scientist at UC Berkeley.

The predators he's talking about are piranhas,

but the mighty Arapima has them beat with its scales,

...