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, yacult.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 YacL.

Hi, and welcome to Cosmos Quickly.

This is Lee Billings.

And this is Corinne Leone.

Corinne, thanks so much for being here.

A quick question for you.

What's super duper bright and hundreds or even thousands of times heavier than our entire solar system,

yet it's so hard to find that it has yet to be directly seen.

Hmm.

It's not a good riddle, I admit.

The answer, though, is a population three star.

That's astronomer lingo for the very first stars in the universe,

which formed from dense clouds of pristine hydrogen

and helium that filled the cosmos in the first few hundred million years after the Big Bang.

Those conditions should have allowed population three stars to bulk up to proportions impossible

for more chemically enriched modern-day stars to achieve.

Right. Okay. And these massive stars were also foundational for everything else we see

...