"Impact Protection Potential of Mammalian Hair: Testing the Pugilism Hypothesis for the Evolution of Human Facial Hair"
https://academic.oup.com/iob/article/2/1/obaa005/5799080
"Impact Protection Potential of Mammalian Hair: Testing the Pugilism Hypothesis for the Evolution of Human Facial Hair"
https://academic.oup.com/iob/article/2/1/obaa005/5799080