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 Americans' 60-second science. I'm Steve Merski. Got a minute?

40 years ago yesterday, November 24th, 1974, paleoanthropologist Donald Johansson found in Ethiopia

what's arguably the most famous and important fossil of a human ancestor, Lucy.

Last month at the Science Writers 2014 meeting in

Columbus, Ohio, Johansson talked about the moment he laid eyes on Lucy. On that eventful day

in 1974, I was out with a graduate student, Tom Gray, and we were walking back to our

Land Rover to go back to camp to enjoy a swim in the

river with the crocodiles and enjoy a nice little lunch. And I am always looking at the ground.

I find more quarters by parking meters than anybody I know, I think. And you know how it is?

You find what you're looking for, right?

Because a year before the discovery, a geologist had left his footprints

four to five feet away from the skeleton because he was looking for rocks.

I was looking for bones.

And I found a little piece of elbow, that little hinge that allows us to flex and extend

our arm.

And I knew from my studies of osteology, of comparative anatomy and so on, that this had to

be from a human ancestor.

...