http://www.youtube.com/watch?v=V7vpw4AH8QQ
Time Travel: Einstein's big idea (Theory of Relativity)
http://www.youtube.com/watch?v=X02WMNoHSm8&mode=related&search=
Is Time Travel Possible?
http://www.youtube.com/watch?v=E2sp-clMk8s&mode=related&search=
Time travel with proof
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