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.com.j.

That's y-A-K-U-L-T dot-C-O-J-P.

When it comes to a guide for your gut, count on Yacult.

This is Scientific Americans' 60-second science.

I'm Steve Merski.

Noise can prevent an animal from hearing other important sounds.

Rachel Buxton, a conservation biologist at Colorado State University.

Buckston and colleagues wanted to see, or rather hear, whether sounds made by human activity

called anthropogenic sound, think airplanes, highway traffic, heavy machinery,

were significant in protected areas around the country.

Park service engineers on our team used over a million hours of acoustic measurements, taken from 492 sites around

the contiguous United States, and they built a sound model.

So to get at an idea of noise pollution, we use two thresholds, where anthropogenic noise raises sound levels

3 and 10 decibels above natural.

Which translates to a doubling and 10 times increase in sound levels.

Buxton and her team determined that humans were responsible for doubling the sound in 63% of protected areas,

and we raised the natural sound levels by 10 times in 21% of such landscapes.

These levels are known to impact both the human experience in national parks

and have a range of repercussions for wildlife. So animals use

...