It is all about TIME.........
It is actually very simple. Cosmologists tell us that time and space are essentially part of the same thing - one can't exist without the other. Newton tells us that for every action, there is an equal and opposite reaction. As far as we've been able to measure, all the mass in the known universe is traveling forward through time at the rate of, er, 1 second per second. That's a whole lot of temporal inertia. So where's the reaction?
If the Big Bang created equal amounts of matter and anti-matter, perhaps in kicking us "forward" in time, the "bang" pushed the anti-matter "backwards"!
This neatly explains our motion through time, where all the anti-matter went, and what happened before the Big Bang!
Of course "forward" and "backward" are relative, as Einstein pointed out. If we could see the anti-matter universe it would appear to be traveling backward in time to us. But from *their* perspective, we would be the ones traveling backwards in time.
QED.
;-)
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Pete