A concept frequently used as a plot device involving the manipulation of events by characters traveling through time.

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Why don't Marty's parents ever mention how similar he looks to the Marty of 1955?

Although Marty is only in 1955 for one week, he plays a pivotal role in getting his parents together. He even briefly dates his mother. So, considering he plays such a pivotal role, does it make sense ...
29
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5answers
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What does the woman from the future mean when she says she's “in insurance”?

At the end of 12 Monkeys, the doctor spreading the virus gets on a plane and sits next to a woman we know (or can assume) is from the future. She tells the doctor that she's "in insurance." What does ...
9
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3answers
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In the Time Travellers Wife why does Henry never meet himself?

There are several occasions in the Time Travellers Wife where Henry arrives at the same point as he's already been, such as when he sees himself die and when Alba is conceived. Why does he never meet ...