Episode 5: The Avengers, Time Travel, and The Deutsch Proposition
The Theory of Anything
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Stephen Hawking's Time Travel Party
The only way a time traveler could have shown up to Stephen Hawking's party would be if somebody from the future had access to alien technology that had built a time machine. Einstein's theory allows for it and quantum mechanics does not disallow it so between the two theories we actually have some fairly good reason to believe time travel may indeed be possible says Deutsch.
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