After all, Einstein, in his special theory of relativity, had shown that time slows down for objects moving close to the speed of light.

CNN: ASIANOW - TIME Asia | Asia Buzz: Travel in Time

Working on a theory to combine quantum mechanics with Einstein's special relativity, he realised his equations predicted a corresponding anti-particle for every particle in existence - identical in every respect, but with an opposite electrical charge.

BBC: The problem with anti-matter

Einstein's special relativity theory that says energy equals mass times the speed of light squared underlies "pretty much everything in modern physics, " said John Ellis, a theoretical physicist at CERN who was not involved in the experiment.

MSN: Neutrinos clocked moving at faster-than-light speed