This article is from the Lefthanders FAQ, by Barry D. Benowitz b.benowitz@telesciences.com with numerous contributions by others.
While lefthanders doubtless runs in some families, scientists
are unsure that the issue is completely resolved. Part of the
problem has to do whether a person's hand preference is the result
of genetic determination or some other reason ie forced to switch
because of convention, accident, what ever.
 
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