Warp wrote:
>   So why does it interfere with itself when there are two slits but not
> when there is only one? 

Here's another conceivable answer, btw:

The electron you shoot out second? It's the same electron you shot out 
the first time. Since it knows whether the slit was open or not last 
time, it knows whether to follow the probability distribution of a 
1-slit or 2-slit experiment. Since either is random, the fact there's a 
one-electron delay between the two cases isn't visible.

Now, why is that sillier than "it knows whether you're going to measure 
which slit it went through after it has already gone through them"? :-)

-- 
   Darren New / San Diego, CA, USA (PST)
     "That's pretty. Where's that?"
          "It's the Age of Channelwood."
     "We should go there on vacation some time."

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