Most of his writing is missing. Only 6,000 of his estimated 13,000 pages of writing remain. The missing 7,000 pages formed the basis for “Da Vinci’s Demons”, covering the period during his mid-twenties.
He invented the robot. His inventive mind gave birth to gadgets and machines that we take for granted today, including the ball bearing, the bicycle, helicopter, machine gun, armored tank, parachute, cross bow and yes…even the robot.