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Old 01-03-2012, 11:11 AM
Reno Nevada Reno Nevada is offline
Join Date: Apr 1999
Location: TX
Posts: 952
The best answer that I have ever read to this question was of course Cecil's:

The long answer is very complex, but the short answer is that with quantum effects we can demonstrate that in fact a particle is NOT "in one or the other of two states, but we don't know which"; it IS true that "the particle is somehow in both states simultaneously".

The Schrodinger's Cat paradox scales that observation up to macroscopic objects, and there is probably some effect that destroys the paradox during the scaling, but at the particle level there is no doubt of what is going on.