An introduction to Leonardo da Vinci's genius focusing on his famous notebook sketches and the modern inventions they predicted. In 1781, Thomas Paine came up with a model for a single-span bridge; in 1887, Adolf Eugen Fick made the first pair of contact lenses; and in 1907, Paul Cornu built the first helicopter. But Leonardo da Vinci thought of all these ideas more than five hundred years ago! At once an artist, inventor, engineer, and scientist,...