"... In a separate group of swimmers (nine who shaved body hair and nine controls), removing body hair significantly reduced the rate of velocity decay during a prone glide after a maximal underwater leg push-off. It is concluded that removing body hair reduces active drag, thereby decreasing the physiological cost of swimming. [Link]
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.]