“Every new book by Frans de Waal is a cause for excitement, and this one is no different. A breath of fresh air in the cramped debate about the differences between men and women. Fascinating, nuanced, and very timely.” —Rutger Bregman, author of Humankind: A Hopeful History In Different, world-renowned primatologist Frans de Waal draws on decades of observation and studies of both human and animal behavior to argue that despite the linkage between gender and biological sex, b