The Time Machine
"Scientific people," proceeded the Time Traveller, after the pause required for the proper assimilation of this, "know very well that Time is only a kind of Space".
Rod Taylor then promptly dives into the leather seat and pushes the lever to accelerate into Time. Popular conceptions of time travel have evolved little since H. G. Wells' story. The fact is that 20th century physics, after Relativity, did little to alter our notions of time. Moreover, even Relativity could not cure us of this charming delusion, in which The Time Traveller is almost always depicted hopping into a futuristic vehicle, as if about to drive down the road. Is this not itself a hint that GR might fail when it comes to cosmological scales?
In M-Theory, the picture must change. When quantum information content defines Epoch, there is the idea that humans (or things of a similar complexity) can only have arisen in this environment, in this now. Now must become a time, a time we understand better than a distant time, like a Planck time we cannot see.