Says this study. Thanks, Boing-Boing, for
linking to this and making me confused about my plain-old-average-sized feet (or, interestingly, feet that I always thought were average...but it turns out they
were average-sized a generation or two ago!).
[And so you know, when you type "average foot size" into Google, the first link to pop up is the Wikipedia entry for "human penis size."]