Leonardo da Vinci designed a tank, robotic knight, parachute
Italian painter and inventor Leonardo da Vinci's works show designs of a robotic knight, a parachute and an armoured tank. He also worked on developing an aerial screw of a helicopter, a submarine, a self-propelled cart and ball bearings, among other things. Leonardo da Vinci was born 565 years ago, on April 15, 1452.