Mary Roach
 is the author of seven best-selling works of nonfiction, including 
Grunt, 
Stiff, and, most recently, 
Fuzz. Her writing has appeared in 
National Geographic and the 
New York Times Magazine, among other publications. On this episode of Little Atoms, Mary talks to Neil Denny about her latest book 
Replaceable You: Adventures in Human Anatomy.
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