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 Yacolt.

This is Scientific American's 60-second science. I'm Christopher in Taliatta.

One of the biggest drawbacks to wearing a smartwatch is how often you have to take it off to charge it.

But here's an idea.

How about charging it with a power source that's pretty ubiquitous nowadays?

Wi-Fi.

Wi-Fi signals are all around us, and most of them are just wasted.

Xu Jong, an electrical engineer at MIT.

Writing in the journal Nature, he and his colleagues describe a device called a rectenna

designed to capture energy from Wi-Fi signals and turn them into direct current electricity.

The rectena consists of a small gold antenna, about the size of an SD card,

which converts a variety of wireless signals like Wi-Fi, Bluetooth, and cellular LTE, into an AC

signal. Next, a three-atom-thick layer of molybdenum disulfide converts that AC signal into usable

DC electricity. That layer is called a rectifier. Slap it onto the antenna

and the result is the rectena. The device is flexible and using typical home Wi-Fi signals,

it spits out about 40 micawatts, enough to light up a simple LED display or power a biosensor.

It's not enough juice for power-hungry smartwatches and

smartphones just yet, but Zhang says their next goal is to build an array of rectennas to power

...