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.

When you walk with a backpack, you know how the stuff inside sways from side to side?

Now scientists have figured out how to tap into that motion to generate electricity.

Here's how it works. Picture a pendulum, mounted to a backpack frame and stabilized with springs on either side.

The pack's weight is attached to the pendulum, so the pendulum swings side to side as you walk.

Gears then use that swinging motion to drive a generator, and the generator spits out electrical

current to charge a battery. Volunteers carried that pack while walking on a treadmill,

and they wore masks to measure the flow of oxygen and carbon

dioxide. Walking with the slightly swaying 20-pound load, the device did not significantly

affect the volunteer's metabolic rate, compared to when they carried the same weight fixed in place.

In fact, the energy harvesting pack reduced the forces of acceleration they'd feel in a regular

pack, which might mean greater

comfort for a long hike. And the device did produce a steady trickle of electricity, the operative word

being trickle. Because if you up the load to 45 pounds, the passive motion of the pack could

fully charge a Samsung Galaxy S10 smartphone only after 12 hours on the trail.

The details are in the journal Royal Society Open Science.

But here's the rucksack rub.

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