You will not be getting your "Back to the Future" on according to Professor Du Shengwang and his team of science-fiction-ruining physicists at the Hong Kong University of Science and Technology. They have allegedly proven that a single photon cannot travel faster than the speed of light. This little demonstration means no time travel — ever.
The possibility of time travel was raised 10 years ago when scientists discovered superluminal — or faster-than-light — propagation of optical pulses in some specific medium, the team said. It was later found to be a visual effect, but researchers thought it might still be possible for a single photon to exceed light speed.
Set aside your aspirations of becoming Michael J. Fox, and don't quit your day job.
[Source: Discovery News]