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Thank you. and quote Science Podcast to receive special offers. Welcome to the Science Podcast for July 8, 2016. I'm Sarah Crespi.

In this week's show, Kevin Wagner discusses an exoplanet in a three-star system,

and David Grimm is here with a roundup of stories from our daily news site.

Now we have David Grimm, editor for our online daily news site.

He's here to talk about some recent stories.

First up, we have a story, a sad story, about our knees.

How are your knees, Dave?

Ever feel a twinge now and again? My knees are okay, but I'm not a runner. I think if I were,

my knees would probably be worse. And Sarah, your knees? They're just fine. Thank you. Again,

I'm not a runner either. But that's not the case for a lot of people. A lot of people wear out their knees, as they say. And it turns out that wearing out may be irreversible.

Right. This study relies on this really cool technique I've written about in the past, and it relies on

nuclear weapons testing. It turns out after World War II, a lot of nations were detonating

nuclear bombs in the atmosphere. And what that did was that pumped a lot of an isotope known as

carbon 14, which is a heavier version of carbon into the atmosphere. Now, our bodies take up that

carbon 14. And there's still some of that up there. So even people born today are going to take up a little

bit of that heavy carbon, not as much as if they were born 50 years ago. But what the researchers can do

...