Off by a Hair(line)
By morning's light it dawned on me that I incorrectly stated Daniel Greene's method of estimating life-size heads. The measure he uses is the span from the tip of the thumb to the tip of the middle finger. So -- put the tip of the thumb on your chin, and the tip of the middle finger should just reach your hairline (or the place where it used to be). I didn't catch my misstatement because I have very large hands and the other-stated measure works for me as well (as the extended thumb is pretty close to perpendicular to the heel of the hand anyway).
The "correct" procedure will give you that extra half inch or so you may have been looking for. Apologies to anyone who went away earlier thinking that their hairlines had suddenly receded beyond the norm.
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