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National Geographic: Time Travel  (Full Documentary - 45 min)
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Leading experts, including Professor Stephen Hawking and Dr Michio Kaku, reveal their views on time travel. Is it possible or a fantasy in the realm of science fiction?

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Viewer comment: "Ron Malletts father dies of a heart attack when he's a child. This inspires him to build a time machine to travel back and save his father. The problem is that if he is actually successful and saves his father then there is no motivation to build the time machine and save his father."  A time-travel paradox.
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