Winner of the W. W. Howells Book Prize from the American Anthropological Association and named one of the best science books of 2021 by Science News"DeSilva takes us on a brilliant, fun, and scientifically deep stroll through history, anatomy, and evolution, in order to illustrate the powerful story of how a particular mode of movement helped make us one of the most wonderful, dangerous and fascinating species on Earth. "-Agustin Fuentes, Professor of Anthropology, Princeton University and author of Why We Believe- Evolution and the Human Way of Being"Breezy popular science at its best. Makes a compelling case overall. "-Science NewsBlending history, science, and culture, a stunning and highly engaging evolutionary story exploring how walking on two legs allowed humans to become the planet's dominant species. Humans are the only mammals to walk on two, rather than four legs-a locomotion known as bipedalism. We strive to be upstanding citizens, honor those who stand tall and proud, and take a stand against injustices. We follow in each other's footsteps and celebrate a child's beginning to walk. But why, and how, exactly, did we take our first steps? And at what cost? Bipedalism has its drawbacks- giving birth is more difficult and dangerous, our running speed is much slower than other animals, and we suffer a variety of ailments, from hernias to.