It is well known that infinity minus one (or minus a 100 or 1000) equals infinity. So if we can find an infinite souce of energy and take some away .......we still have an infinite source of energy and some! Now that may seem a might trite so chew on this. Einstein teaches that the speed of light is the same for all observers. So let us bounce some light off an object, transferring some of the photons' momentum to it. The 'bounced light' still has the same speed and therefore energy, but the object has 'gained' some momentum. Is this a potential source of free energy?