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 ...

If you did, you witnessed them erroneously refer to the possibility of perpetual motion in reference to the air-car. While there is no perpetual motion at work here, there may be production plans ...