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 yawcp.co.j.jot.com.j. That's y-A-K-U-L-T-C-O-J-P.

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

This is Scientific American's 60-second science. I'm Christopher in Taliatta.

Knuckles.

You may not mind the sound, you may despise it, or you could study it.

A couple years back, Vinnie Sujo was taking a biomechanics class

at the French Polytechnic school outside Paris,

and he was on the hunt for the perfect class project.

Even though they suggested many projects, I couldn't find one which is both practical

and that I could complete within the framework of this class.

So in frustration, I was cracking my knuckles one day and that's when I realized, huh, that's interesting.

And so a project was born, the physics of knuckle cracking. It's actually a subject of

intense scientific investigation. Back in 1971, scientists figured they knew how it worked.

The cracking sound was caused by bubbles popping within the

fluid surrounding the knuckles. Or so they thought, because in 2015, shots were fired in the form

of MRI visualization of the knuckles post-cracking. In fact, the bubbles were still there.

The whole process happens too fast for imaging technology to visualize in real

time. You'd need to shoot at 1,200 frames per second, 10 times faster than the best x-ray and

MRI machines on the market. And that's when we realized that our model could help people

...