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For more than thirty years-half his life-he was obsessively devoted to investigating everything in the natural world. Nothing escaped his interest-how our eyes see, why the sky is blue, what forces build mountains, how light travels, where water comes from, and-most fascinating of all to Leonardo-the inner workings of the human body. Nothing stopped him. It was illegal to dissect human corpses, so he did autopsies in secret, even devising a clever...

Once again, three friends are sent back in time by a magic book and they meet Leonardo da Vinci and try to avoid becoming toilet scrubbers in a sixteenth-century Italian army.

Presents the life and accomplishments of the famous artist, scientist, engineer, and inventor.