I wonder?

I wonder, is the speed of light constant? Einstein believed it was and his theories were based on this belief. I believe there needs to be another possibility that he missed? Moving at great amounts of speed can't be impossible, because if it is so this is the end of the attempt to look beyond the excepted norm. Is their away to get around E=mc^2. An alternative attempt at space travel is to warp the space the we pass through. Because the distance is shortened and the relative speed doesn't matter. What to do now? We seek over generations the ability to manipulate time and space for our own means. Our ancestors succeeded to get us here, Now we continue to raise the bar. The future generations go beyond our means. Now we need to speculate on everything and try to forward our knowledge.