> Thanks!  This is like undoing historical events. If you forget about the
> fact that dinosaurs ever lived on Earth and there is an alternative 
> history
> that led to your existence in the multiverse, and you do the memory 
> erasure
> also in sectors were dinosaurs never lived, you have some nonzero
> probability of finding yourself on an Earth were the dinosaurs never 
> lived.

The problem I'm having with this line of reasoning is that "memory" isn't a 
fixed physical object.  Memory is reconstructive, and depends upon emotional 
triggers both at the time when the memory was encoded and at the time when 
it re-examined in the conscious mind.  No memories are particularly 

Most of the time, I'm not aware that dinosaurs existed because I'm not 
thinking about it, or any other part of Earth's history, for that 
matter...but I don't seem to have the experience that my environment is 
impoverished of history altogether just because I hadn't been thinking hard 
enough about it.  As another example, people who have false recovered 
memories through psychotherapy invariably end up unable to confirm them when 
they look for facts to back up their new memories, and that happens in my 
universe even though I personally don't have any information to confirm or 
deny their memories.

In other words, I don't see why forgetting something is any more likely to 
change events than simply being wrong about having the memory in the first 
place, the latter of which happens constantly.  If you want to argue about 
what nonzero probability implies, you'd have a hard time showing that 
anything non-contradictory at all has a nonzero probability of being true. 

> Because of the entanglement, I don't think you can, in general, reverse 
> the spin
> state of the  particle without reversing what is known about it by "the 
> rest of
> the world".

The rest of the world?  What's that?


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