Head Defies Laws of Physics With Perpetual Motion Tennis Machine

Serbian tennis star Novak Djokovic hooked up with a couple of scientists to create a perpetual motion machine that defies the laws of physics. Of course, that's not really what they set out to do but days later the "experiment" is still going.

The team put together a bunch of tennis racket stands and tennis balls hung from the ceiling. Djokovic then took the first shot kicking of the experiment. Apparently the rackets and balls are still in motion and you can view them in action here.