Is a Time Machine Really Possible?

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Time travel is a perennial favorite trope of science fiction and has been ever since I went back to the 1890s and mentioned the idea to H.G. Wells.

Who hasn’t fantasized about it, in one form or another?… to see dinosaurs with your own two eyes, or to tell your younger self to invest in Google, or to suggest to JFK that perhaps a convertible is a bad idea, after all.  The possibilities are endless.

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But it’s a topic that’s rife with contradictions, paradoxes, and conundrums. Is time travel prohibited by the laws of physics, or is it just around the corner, along with jet packs and lunar colonies?

What does science have to say about this science fiction device?

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