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RE: opposable hands in humans?

Greetings,
        Do humans have truly opposable hands?  The natural closure
of the hands gives us a fist with the thumb pointing to the base of the
little finger and the fingers pointing along the mid-line of the palm.
I can force my hand to operate in a truly opposable fashion, but it is not
natural.  In gripping a tool, the SIDE of the thumb opposes the other 
digits.  The axes of coiling are not parallel however.