Leonardo da Vinci, back in 1494, said: Oh ye seekers after perpetual motion, how many vain chimeras have you pursued? Go and take your place with the alchemists. There was a rumor in the 8th ...

Leonardo da Vinci approached the world with a fearless ... hoists, clocks and a perpetual motion machine. He even designed a city built on two levels to improve sanitation! But potentially his ...