Tor Olav Kristensen wrote:
>> So, the division by pi makes sense to me, but does anyone have any 
>> idea where the + 0.037 comes from?
> 
> Maybe they allow for some hair in addition to the scull diameter (?)

I think that this idea and Darren's sound the most plausible (in this 
case it's not due to rounding).  Still, I think I'll write them a 
handwritten letter in florid prose with several diagrams and tables on 
parchment paper inquiring as to the true reason so that my curiosity may 
be fully satisfied.

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