http://www.nytimes.com/2009/10/13/sc...c.html?_r=1&emWhile it is a paradox to go back in time and kill your grandfather, physicists agree there is no paradox if you go back in time and save him from being hit by a bus.
Large Hadron Collider
http://www.nytimes.com/2009/10/13/sc...c.html?_r=1&emWhile it is a paradox to go back in time and kill your grandfather, physicists agree there is no paradox if you go back in time and save him from being hit by a bus.
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