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-Lt.C-O.jp. 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.

Smartphones can already verify your identity by scanning your fingerprint or your face,

but there's something inside you that's also unique proof that you're you.

Researchers have developed a device that uses low-powered Doppler radar

to decode the unique geometry of a user's heart,

and how it squeezes and swells as it beats.

That biometric information can authenticate the identity of the person under scrutiny.

And if the wrong person sits down?

So it would recognize there is a heart, but the geometry of my heart is different from yours, so it still lock me out.

Wen Yao Shu is a computer scientist at the University of Buffalo, who helped develop the tech.

He says this unusual biometric is robust because it's actually two different biometrics.

The first is the shape of your heart, a biologic biometric or static trait,

like fingerprints or iris patterns. The second is the beating of your heart, what's called a

behavioral biometric, which analyzes a dynamic process and can be harder to spoof. So far,

they've tested the system on about 100 people, with an accuracy of over 98%.

They'll present the results this month at the Mobacom conference in Utah. Shew says the radiation

from the device isn't harmful, just a fraction of what we get from our smartphones, but at a couple

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