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Summario
DescriptionGrandfather paradox billiard ball.svg
English: A diagram of a grandfather paradox illustrated with a billiard ball.
Top: original billiard ball trajectory. Middle: the billiard ball emerges from the future, and delivers its past self a strike that averts the past ball from entering the time machine. Bottom: the billiard ball never enters the time machine, giving rise to the paradox, putting into question how its older self could ever emerge from the time machine and divert its course.
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