There have also been some quantum physics experiments that have also challenged the notion of a universal "constant". They aimed a thin radio beam at a dense block of metal. Ordinarily, the radio waves are completely blocked and no signal could get through to the reciever on the other side. But when dealing with the world of quantum physics, the impossible often becomes possible. Strange events seem to be the norm when dealing with the sub atomic world. Radio waves can only travel through space at the universal constant or the speed of light. But for some unknown reason, microscopic signals were getting through to the reciever. These scientist were recording results of these signals traveling through the block at 4x the speed of light. Which means that the signal was actually being recieved before it was even sent.
Wierd, wild stuff.