Time Travel - The promise of time travel has long been one of the world's favourite scientific 'what-ifs?'. With the aid of stunning CGI, Stephen Hawking explores all the possibilities, warping the very fabric of time and space as he goes. From killing your grandfather to riding a black hole, we learn the pitfalls and the prospects for a technology that could quite literally, change everything we have ever known. (From the UK) (Documentary Series) (Part 2 of 4) G CC
I believe you can still watch the episode several days after it has aired here
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