David Bainbridge is the Clinical Veterinary Anatomist at Cambridge University (UK). He trained as a veterinary surgeon and has carried out research at the Institute of Zoology at Regent's Park, the Royal Veterinary College, and Cornell, Sydney and Oxford Universities. His previous popular science books include Making Babies: The Science of Pregnancy, The X in Sex: How the X Chromosone Controls Our Lives, and Beyond the Zonules of Zinn: A Fantastic Journey Through Your Brain (all published by Harvard University Press). He lives in Suffolk, UK with his wife and their three children, who are edging inexorably towards adolescence.