His best (What I think is the best.) inventions/ ideas where (in order from the least to the best)
Parachute
Ball Bearings
Ornithopter
Machine Gun
Diving Suit
Armored Tank
Self-Propelled Cart
City of the Future
Aerial Screw
Robotic Knight
Parachute
Ball Bearings
Ornithopter
Machine Gun
Diving Suit
Armored Tank
Self-Propelled Cart
City of the Future
Aerial Screw
Robotic Knight