My guest today on the podcast did a firsthand investigation of the fascinating history of military research and shared her findings in a highly readable and entertaining book. Her name is Mary Roach and she’s the author of "Grunt: The Curious Science of Humans at War." Today on the show, Mary gives us a look inside the military fashion departments that create uniforms that keep soldiers cool, comfortable, and protected from chemical weapons, all while still looking good, unpacks why diarrhea has always been one of the biggest threats in war, and discusses why conquering the need to sleep has been a goal of militaries around the world for ages.