CAROLINE DODDS PENNOCK is one of the world’s foremost authorities on Mesoamerica. Trained at Oxford, she is senior lecturer in international history at the University of Sheffield. Her study of Aztec human sacrifice, Bonds of Blood, won the Royal Historical Society’s Gladstone Prize in 2008. She has appeared as a presenter on history series on the BBC and Netflix, and has written for BBC History Magazine, History Today, and Scientific American