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The trouble with time travel...

In Back to the Future, Marty McFly faces some mind-warping time travel paradoxes. John Gribbin explains the science behind time travel in the movies and whether travelling through time is possible.

Is time real or an illusion?

Diverse thinkers, from the ancient Greek philosophers through contemporary quantum cosmology and eternal inflation theory, have called time an illusion. Are they right?

Nothing is Impossible

Time travel, telepathy, free energy… science-fiction pipe dreams, right? Not according to scientists who are stretching the laws of physics to the brink. Paul Parsons says to hell with the horizon.