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Leonardo da Vinci’s notebooks are mind-boggling evidence of a 15th-century scientific genius standing at the edge of the modern world, basing his ideas on observation and experimentation. This book will change children’s ideas of who Leonardo was and what it means to be a scientist.

As the Germans waged a brutal war across Europe, details of every Nazi plan, every attack, every troop movement were sent over radio. But to the Allied troops listening in―and they were always listening―the crucial messages sounded like gibberish. The communications were encoded with a powerful cipher, making all information utterly inaccessible … unless you could unlock the key to the secret code behind the German’s powerful Enigma machine.

This book explores the world of Sigmund Freud, who, making it into the author's highly popular series due to his creation of a brand-new branch of medicine called psychoanalysis, introduced the world to such controversial theories as Oedipal complexes, the id, and the ego.