Science has in the past been sceptical of physical time travel, assigning it a place next to fairies and unicorns. Still, now longer in the realm of fantasy, time travel is now being discussed as a possibility.
One of the greatest fundamental problems of physical time travel is the Grandfather Paradox. The idea that a person could go back in time an prevent themselves from being born, by eliminating their ancestors. Evenso, science says that something would happen to prevent you from doing so thus the new model of reality permits time travel.
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