World Beard and Moustache Championship - Rolan...

“An excess of electromagnetic radiation in the ultraviolet waveband can cause severe damage to skin cells and their DNA. Fortunately, various natural protection mechanisms exist, but until recently, one has been almost entirely overlooked in the dosimetric literature. New details are revealed in the latest (July 2012) edition of the journal Radiation Protection Dosimetry, which features a paper from a cross faculty team at the University of Southern Queensland, Australia.” (Improbable Research)

[As someone who has shaved only three times in more than forty years, I knew this...]

Also see: Solar Ultraviolet Protection Provided by Human Head Hair (Photochemistry and Photobiology, Volume 85, Number 1, January/February 2009 , pp. 250-254)

BONUS (unrelated): Feline Reactions to Bearded Men