A colorful history of purposeful plummeting, from our ancestors in the trees to bungee-jumping. Anyone who has gone over the crest of a roller coaster should wonder why that terror is so much fun. Garrett Soden shows how the act of taking a fall has evolved from a symbol of wickedness in the ancient imagination to the inspiration behind much of today's recreation. Beginning with the tree-climbing lessons of our earliest ancestors, he takes us on a...