In reality, the paradox occured when the time travel took place. By traveling backwards in time you've essentially created matter and energy out of nothing. The amount of matter/energy in the universe is constant. The particles that eventually became you already existed back in 1000 AD. They can't exist there in two places at the same time. To the universe, it'd look like new matter suddenly popped into existence. The Universe HATES that when it happens.
Man you beat me - I will just have to travel back in time and post before you . Oh wait I can't do that ther would be too many atoms just then.
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