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.

J-P. That's Y-A-K-U-L-T dot CO.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.

Last time you hit the beach, and I know it probably seems like a distant memory

in the currently chilly parts of the world, did you pack sunscreen, a beach umbrella, or both?

Researchers put the two sun-protecting products to the test.

First contender, a beach umbrella, which they evaluated

with a spectrophotometer to see a few rays pass through. They didn't. Good sign so far.

The second contender was sunscreen, 100 SPF. Then the scientists rallied 81 people to go sunbathing

at a lake outside Dallas for three hours around midday. Half got

beach umbrellas. The other half, all you can apply sunscreen. And because this is science, not a day at

the beach, or not a walk in the park, the participants were not allowed to take a dip.

24 hours after the solar exposure, enough time for any sunburns to ripen, the researchers

visually inspected the sunseekers skin, and they found that three times as many umbrella

sitters had sunburns somewhere on their bodies, compared to their sunscreen-slaathering

neighbors.

And since the umbrellas themselves block UV rays, the burns are likely due to UV light bouncing off the sand and other surfaces, then hitting unprotected skin.

The study is in JAMA dermatology.

The caveat here, even sunscreen users were not completely burn free.

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