Mary Roach is the author of Gulp: Adventures on the Alimentary Canal. Her previous works include Stiff: The Curious Lives of Human Cadavers; Spook: Science Tackles the Afterlife; Bonk: The Curious Coupling of Science and Sex; and Packing for Mars: The Curious Science of Life in the Void. Her essays have appeared in Vogue, GQ, National Geographic, and Wired.