Physicists Tame Time Travel by Forbidding You to Kill Your Grandfather(wired.com)
wired.com
Physicists Tame Time Travel by Forbidding You to Kill Your Grandfather
http://www.wired.com/wiredscience/2010/07/time-travel/
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http://www.wired.com/wiredscience/2010/07/time-travel/
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