> But it is a fully valid question to ask, "Why are we the only life form
> in the galaxy to ever leave their home world that we know of for
> certain?" And, applying occam's razor (which is a method deep in the
> heart of science), we find that the most rational, scientific answers
> are: (A) Interstellar travel is not feasible, or (B) Interstellar travel
> has not been discovered yet, by /any/ species in our galaxy whatsoever.

Isn't there a big assumption there that we would be able to 
notice/detect any interstellar travel anywhere in the galaxy? Or are you 
assuming that any species able to do interstellar travel would, for some 
reason, visit our solar system?

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