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.c-O.jp. When it comes to a guide for your gut, count on Yacult.

This is Scientific Americans' 60-second science. I'm Marissa Shea.

One of the delights of summer is watching monarch butterflies dancing through the air,

but it's becoming harder to see them in certain locales.

In some places, the population has dropped by as much as 90%.

And climate change may make life even more challenging for these charismatic insects.

That's because higher carbon dioxide levels can lower the amount of toxins in milkweed,

the monarch caterpillar's food. The caterpillars use those toxins to protect themselves from a

deadly parasite that produces spores. When the caterpillars are really small,

those spores get into the monarch's gut,

and they break apart,

and they start drilling holes in the gut lining

and reproducing and just doing nasty parasite things

that are bad for the monarchs.

Leslie Decker, an ecologist at Stanford University.

Decker and her colleagues raised hundreds of monarchs.

They fed half the caterpillars milkweed grown at current CO2 levels.

The other half got milkweed grown at nearly double those CO2 levels.

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