For more than a century finger length (proportion) has been known to represent a manifestation of genetics & hormones combined. Unfortunately, the assessment of finger length (proportion) has not been defined very well. So far nearly all sources have defined finger length proportion relative to a single aspect of the palm: some sources use palm length, other sources use palm breadth (= hand width measured at the metacarpals). But interestingly, the argument for using only palm length or ...
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