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Happy Monday listeners. For Scientific American Science quickly, I'm Rachel Theltenman.

Let's kick off the week by catching up on some of the science news you may have missed.

First, a quick bird flu update.

If you're a regular listener, you already know that H5N1 bird flu has been circulating in U.S. cattle for almost a year.

That's been thanks to a type called B3.13.

Now, a different variant of H5N1 that had been circulating in birds, known as the D1.1

genotype, has shown up in six herds in Nevada.

This suggests that our current outbreak involved more than one spillover event, or an instance

when a bird transmitted H5N1 to a cow.

We don't know when the D1.1 variant hopped over to cattle or how widely it's circulating.

People have previously been infected with D1.1, including two severe cases, and NPR reports

that scientists have speculated that this genotype might be more dangerous to humans.

D1.1 was also responsible for the first U.S. death from H5N1 flu, when someone in Louisiana caught it from backyard flocks.

Let's move on to some other health news. Last Monday, a study in nature medicine reported surprisingly high amounts of

microplastic in human brain tissue. Researchers looked at tissue samples from the brains, kidneys,

and livers of 52 cadavers, and found that the brains contained seven to 30 times higher concentrations of

microplastics than those other organs. They also noted that the average concentration of

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