When a subatomic particle changes state, if it changes to all possible states, with each new state being part of a new reality, then yes. It’s been a long time since I’ve done any significant math, but this would mean that with every change of state of every subatomic particle in a given reality:

X is a subatomic particle, Y is all the possible states that that particle can change to, and Z is the number of all subatomic particles in a given reality, then the number of new realities in any given instant is:

(X * Y *Z) ^ (Z-1)

I think. And of course this equation would apply to every new state-change in every “new” reality…at least since the Big Bang.

Sorta makes the Big Bang itself look really small, doesn’t it?

Of course, that would apply if all subatomic particles changed state at the same time. I find that pretty unlikely, so the actual number is probably much less…but still far beyond reasonable human comprehension.

Sorry for the headache. Just don’t try to use LSD while considering this possibility. I fear it wouldn’t end well. :)