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Page last updated at 09:49 GMT, Saturday, 19 November 2011

Can time be reversed?

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Albert Einstein's law that nothing can travel faster than the speed of light has come under threat again from the same controversial experiment which had been disregarded by many physicists.

Dr Giles Barr, a physicist at Oxford University, explains that if particles travel faster than light, time could effectively be "reversed".

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Today: Saturday 19th November

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