“So if you go back in time and kill your mother,” said Jenna, “history is rewritten from the moment of her death forward. Your own history as you knew it no longer exists, and never existed. You are never born. But the universe doesn’t care that you shouldn’t exist, and couldn’t have killed her. It just accepts the reality of a universe in which you exist anyway and she is dead. It ignores the paradox and continues forward from that point.”
