Who knew that body hair was the "moral" equivalent of "barnacles" on a "boat's hull?"
Image from Wikipedia: Photograph taken by Mark A. Wilson (Department of Geology, The College of Wooster). [A beautiful photo as well.]
I bumped into this at "khabarbike.blogspot.com." Here is a complex article regarding why swimmers swim faster when they shave down. It has lots of numbers in it and how researchers conducted their experiments but I just scrolled down to the last sentence for the answer. It's the lack of drag believe it or not. [Link]