Your Body's Real Age

Do all of your cells get switched out for new ones every seven years or so? Does anything remain with you throughout your entire life?

That's the question posed on the NPR podcast Invisibilia by co-host Lulu Miller. Listen to their episode (exploring the constancy of personality) here:
http://www.npr.org/programs/invisibilia/482836315/the-personality-myth

Produced by Adam Cole and Ryan Kellman
Senior Editor and Wardrobe Consultant: Geoff Brumfiel
Supervising Editor: Anne Gudenkauf
Key Grip: Kristin Adair

How did scientists figure all this out? With a little help from nuclear bomb testing. More info here:
http://skunkbear.tumblr.com/post/146593746334/c14

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