Understanding the human body is a team effort. That's where the Yachtel group comes in.

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.jp. That's Y-A-K-U-L-T.C-O.J-P. When it comes to a guide for your gut, count on Yacolt.

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

In January 2014, an epic cold wave swept across the southeast.

A snowpocalypse so severe that thousands of drivers in Atlanta abandoned their cars on icy highways and interstates.

And I'm from the south.

I was raised in South Carolina, and I can tell you that in the South, we do not do cold at all.

Shane Campbell-Staten was watching it all unfold from Harvard, where he was getting his PhD.

He just wrapped up his last field season in Texas, studying the green anole lizard.

And as he was scanning through photos of the storm, he came across something

unexpected, a photo that included his research subject. There was this one picture of a green an

hole that was upside down dead in the snow, and it was sort of a eureka moment, and I thought to

myself, maybe I should go back out and see if these populations that I'd just been studying,

if they had showed

any sort of response to this pretty extreme weather event in the South.

And so that's what he did, because here's the bit of serendipity.

He'd actually been studying the cold tolerance of different populations of these lizards,

and now the cold snap had just delivered the perfect experiment,

a chance to see natural selection in action. So I went back in April right after these winter storms had subsided.

...