Considered by many to be an impossibility, the Emdrive is a device that if real could propel everything from spaceships to flying cars. But how likely is it that anyone has actually succeeded in creating one ?
"The Emdrive is an electromagnetic drive that would generate thrust from a closed system — “impossible” say some experts. To critics, it’s flat-out junk science, not even worth thinking about. But its inventor, Roger Shawyer, has doggedly continued his work."