Malcolm Potts, MB, BChir, PhD, FRCOG, is the Bixby Professor at the University of California, Berkeley. A graduate of Cambridge University and trained as an obstetrician and research biologist, his profession has taken him all over the world. Potts led a medical team into Bangladesh immediately after the War of Liberation in 1972, and he has worked in many other war-torn places including Vietnam and Cambodia, Afghanistan, Egypt, the Gaza Strip, Liberia, and Angola. His most recent books are Queen Victoria's Gene and Ever Since Adam and Eve: The Evolution of Human Sexuality. Thomas Hayden is a freelance journalist who writes frequently about science, medicine, and culture. Formerly a staff writer at Newsweek and US News & World Report, his articles and reviews have appeared in more than 20 publications, including National Geographic, Nature, and The Washington Post. He is coauthor of On Call in Hell: A Doctor's Iraq War Story, a 2007 national bestseller. He lives in San Francisco with his wife and fellow writer, Erika Check Hayden.