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-C-O-J-P.

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

This is Scientific Americans' 60-second science.

I'm Lee Billings.

Take any square kilometer of Earth's surface.

About once a year, an extraordinary event occurs in the sky directly above that patch of land or sea.

The hefty nucleus of a heavy element slams into the top of Earth's atmosphere

at close to the speed of light.

Scientists have been unable to tell where exactly these particles come from, in part because

their trajectories can be nudged by galactic magnetic fields. Another puzzle is how the particles

reach such blistering speeds. Two theories dominate efforts to explain these mysteries. One posits that the particles mostly come from exploding stars and other high-energy phenomena

in our galaxy.

The other speculates that the particles are produced beyond our galaxy, perhaps in the

active cores of other galaxies surrounding the Milky Way.

Now, a study in the journal Science supports that second notion.

Amazingly, any of these ultra-high-energy cosmic rays

has the kinetic energy of an apple falling from a tree to the ground.

That means that Isaac Newton or you would definitely feel it hit your head.

Luckily, that never happens. Instead, when these

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