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Leonardo da Vinci was a Renaissance genius Not only did he paint masterpieces of art but he was an obsessive scientist and inventor dreaming up complex machines centuries ahead of his time including parachutes armored tanks hang gliders and robots On the 500th anniversary of Leonardos death with the help of biographer Walter Isaacson NOVA investigates the secrets of Leonardos success How did his scientific curiosity from dissections of cadavers to studies of optics shape his genius and help him create perhaps the most famous painting of all time the Mona Lisa