Ok, I know you all probably get a ton of lame questions about time travel so I thought I'd add another. If I could travel back in time, would I not be adding extra matter & energy into the universe? What I mean is, my old body & my "future" or "present" body would be added into the universe. I just don't see how that would be possible. Anyway, does anyone have any links to material that addresses this issue? I know time travel is more or less sci-fi but none the less I am curious.