On Wednesday, November 14, 2018 at 6:55:36 PM UTC-6, agrays...@gmail.com 
> On Wednesday, November 14, 2018 at 10:20:09 PM UTC, Pierz wrote:
>> Obviously you can't measure the particle simultaneously in the up and 
>> down state. Nobody believes that. Nobody is arguing it. 
> *Haven't you ever heard of physicists, some prominent who write books 
> about QM for the lay public, who assert that one of the mysteries of QM is 
> that a particle can be in two places at the same time, or cats can be alive 
> and dead simultaneously, or spin can be Up and Dn simultaneously? If you 
> haven't, you're not paying attention. AG*
*"a particle can be in two places at the same time"*

A path-integral realist (one who is "starting from a framework in which 
*histories* are fundamental")* might formulate it this way:

"a particle can have multiple histories — only one of which survives 

* *Hilbert Spaces from Path Integrals*

- pt 

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