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.

Yachtold 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.JP. When it comes to a guide for your gut, count on Yacolt. This is Scientific American Science Quickly. I'm Christopher in Dallata.

When I first started working on this series about Vernal Pools and became convinced I had to go see some for myself,

one of the things that surprised me the most was where people

kept telling me to go to see them. This landmark is by far the largest and most pristine

concentration of vernal pools left in San Diego County and possibly in California. We're standing

in a preserve of hundreds of acres of wild land containing more

than a thousand vernal pools. It's also part of a marine base outside San Diego, Marine Corps

Air Station Miramar. And my tour guide was a wildlife biologist employed by the Department of Defense,

a guy named Chuck Black. Yeah, I never thought that I would be coming to a military base to find the natural resource.

Yeah, yeah, well, lots of people don't associate military bases with conservation efforts.

And it's true, when I think conservation, I think roadless stretches of the Sierra Nevada, or remote

patches of desert in the Mojave.

But here the natural wonder is sandwiched between a highway, a landfill, and a runway.

And there's a reason the military base is the largest remaining stronghold of vernal pools along the Southern California coast.

Lots of other stuff around here just got developed.

The flat mesotops like this were the prime areas for development during the 18, 19th, and 20th century.

The vernal pools became farmland, houses, shopping centers.

It's estimated that over 98, 99% of the vernal pools that formerly existed in San Diego are not here any longer because of the development.

...