Paradoxes

Exploring time travel myths and urban legends.

What is the Grandfather Paradox?

If you've ever seen Back to the Future, you probably know that you shouldn't be messing with things your parents did before you were born. At least, not unless you want to erase yourself from existence. The plot of Robert Zemeckis' 1985 blockbuster is an excellent example of the Grandfather Paradox. However, the concept is much richer and more profound than that. The Grandfather Paradox is a self-canceling contradiction that arises from changing the past. A person who travels through ...
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