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The twin paradox

Michael J. Fox, Doc Brown and the DeLorean used as a time machine

Fasten your belts, take off for the future...

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NIST scientists compared a pair of the finest atomic clocks available to prove that indeed, as relativity predicts, going up a flight of stairs accelerates your aging. Figure courtesy of NIST

A pair of aluminum atomic clocks verify Einstein's twin paradox and time dilation

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Christopher Lloyd as Doc Brown, the inventor of the time machine in "Back to the Future". PR photo

The complete guide for the time traveler

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Philosophical implications of relativity

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Black holes and time travel

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Einstein's signature

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