For thirty years, the whole last half of his life, Leonardo da Vinci was obsessed with unlocking the secrets of nature. His notebooks are the mind-boggling evidence of a fifteenth-century scientist standing at the edge of the modern world, basing his ideas on observation and experimentation. Scrupulously researched, juicily anecdotal, this book will change children s ideas of who Leonardo was and what it means to be a scientist.Award-winning biographer...