A New York Times Bestselling Author The irresistible, ever-curious, and always bestselling Mary Roach takes us down the hatch on an unforgettable tour. The alimentary canal is classic Mary Roach terrain: the questions explored in Gulp are as taboo, in their way, as the cadavers in Stiff and ever bit as surreal as the universe of zero gravity explored in Packing for Mars. And, like all of Roach?s books, Gulp is as much about human beings as it is about human bodies.