You've seen it in "Back To The Future". You've seen it in "Futurama". You've seen it in the 2009 reboot of "Star Trek". It's the Grandfather Paradox (or variations upon it), where somebody goes back in time and changes something so big that it causes an impossible scenario. But what is the Grandfather Paradox, how would it work, and what would happen if somebody actually pulled it off?
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Written By Reuben Westmaas September 16, 2017
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