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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
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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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