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       xkcd - A Webcomic - Decorative Constants (2566)
        
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       Arguably, the '1/2' in the drag equation is purely decorative,
       since drag coefficients are already unitless and could just as
       easily be half as big. Some derivations give more justification
       for the extra 1/2 than others, but one textbook just calls it 'a
       traditional tribute to Euler and Bernoulli.'
        
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