Patrick Elliott wrote:
> Ok. Already gave and answer to why this is odd, but.. Just to let you 
> clarify - How do you "measure" or "observe" what a particle as even 
> done, without colliding it with something?

You don't. But you can make a measurement after it has done something, and 
change what it "has done" already.

> definition, anything you can/do do, which looks at a particle, involves 
> *other particles*, 

Right. But it might involve *other* particles *after* the measurement of 
interest has been completed.

> Again, we can't measure/observe a particle, without interacting with it, 

Sure you can.  Look up Bell's Inequality, or Quantum Erasers.

http://en.wikipedia.org/wiki/Delayed_choice_quantum_eraser

> so claiming that "changing" it by observation differs from changing it 
> by hitting it with another particle is just... not making any sense at all.

That's what makes the copenhagen interpretation problematic, yes.


-- 
Darren New, San Diego CA, USA (PST)
   Human nature dictates that toothpaste tubes spend
   much longer being almost empty than almost full.

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