My buddy Dave sent this one in, and it deserves comment. Roger Shawyer, an English physicist, who has worked on such auspicious programs as Europe’s satellite navigation system (the Galileo project), is in the process of bringing to large-scale production a new type of engine he calls the “emdrive” — for “electromagnetic drive”.
This is an engine (pictured above) that uses microwaves (and blatant exploitation of Einstein’s laws of relativity) to propel the engine foward without any moving parts or fuel to speak of. A relatively-small electrical charge generates microwaves — using the same device found in the average household microwave — and protects them into a cylinder of just the right size and shape to cause the waves to resonate and multiply im intensity. Stir in some relativity principles, and the thing starts moving toward the fat end of the tube. Make it out of superconductive material that won’t bleed energy, and it starts moving fast. Now we’re cooking with … microwaves.