-> But that would mean you'd be a `ghost' at the party surrounding  
-> you, unable to actually interact with events or actors - or to  
-> change the course of the plot... 
  
I'm not sure that I agree that I wouldn't be able to interact. Even if 
I travelled into the past (though no further than the invention of the 
camera/display/transporter, since there'd have to be one there too), 
there is not necessarily a logical conflict involved in my interacting 
with things. Causality can be like a step-ladder, with each part 
supporting the other. What I did back then would affect things now, and 
this might affect what I'd decide to do back then. But so what? 
Obviously, I couldn't destroy the world back then, since there would be 
no now, so, since there is a now, something must happen to stop me from 
doing it. 
  
                             dow 
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