Some scientist believed it was possible to travel faster than the speed of light, and then this guy baffled sceptics when he proved it.
Once we believe that our points of reference are changable, then we realize limits begin within our own minds. This applies to what we hope will happen which can evolve into what we actually help make happen. Personally, I'm looking forward to functional teleportation. Based on the rate of technological progess, that may not be as far away as people think!