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March 2010
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time travel

This issue of Plus is a special, marking the occasion of Stephen Hawking's 60th birthday. Plus attended his Birthday Conference in Cambridge, where we interviewed some of the world's most influential mathematicians and physicists.

Tags: gravity : cosmology : curvature of space : Grand Unified Theory : black hole : Big Bang : quantum mechanics : general relativity : relativity : time travel : wormhole


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Take a journey to the limits of common sense

Tags: theoretical physics : physics : quantum mechanics : time travel


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Mathematicians give green light for time machine

Tags: physics : general relativity : special relativity : time dilation : relativity : time travel