Larry Niven once wrote a treatise called The Theory and Practice of Time Travel. In it he examines the Grandfather Paradox and much more. The fun part comes at the end when he poses a world where time travel was common. People travelled back and forth, changing things constantly, creating messes and cleaning them up. Then he considers that one of them travels to just the right time and kills the only man who ever could have invented a time machine.
He ends with "Maybe that's what happened."
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“Never do anything you can't take back.”
—Rocky Russo
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