I recall reading an article some years ago in a science journal about exactly that supposition -- that there may well have been parallel paths of evolutionary development along side us all the way through the history of life on earth, only they are so radically different from us that we may never recognize them for life. (Of course, it made the explicit supposition that such parallel paths are no farther advanced than one-celled -- or very simple multicelled -- organisms, but still...)
-- Bob
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Then the horns kicked in...
...and my shoes began to squeak.
-- Bob
---------
Then the horns kicked in...
...and my shoes began to squeak.