Engineers design our infrastructure based on engineering teaching and texts which are based in turn on the science of physics . This science says that perpetual motion is fundamentally impossible according to currently accepted theories . Scientists would be very happy if someone could demonstrate a perpetual motion machine to them so that they could update our theories accordingly . You can bet that practical exploitation would quickly follow . <| sep |> As an American who now lives in a no tip country , I don ' t ever wanna go back . Tips are bullshit . Just pay the workers a proper wage . <| sep |> Trade # 427 Trade Completed With uentertainmeimbored Items Traded PayPal vs . 5 Amazon . co . uk <| sep |> Scientology . L Ron is gone but the Con goes on .