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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?
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The question was posed on the NPR podcast Invisibilia by cohost Lulu Miller. Listen to their episode (exploring the constancy of personality) here:
http://www.npr.org/programs/invisibil...

Produced by Adam Cole and Ryan Kellman
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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/1465...

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