Above is an excellent example of beautiful facial hair that does a good job of blocking the sun. That’s right, for those of you who can grow beards – you should. Not only do beards look good they also can serve as sunblock.
But how much sun does a good beard block if a good beard could block sun?
Answer? It blocks the sun that a good beard could block if a good beard could block sun.* At least, depending on the angle, and the thickness of the beard. But how to find out PRECISELY?!
Well for that you need SCIENCE. Science and fake heads with beards on them. On a weathervane. Really.
Parisi et al. “DOSIMETRIC INVESTIGATION OF THE SOLAR ERYTHEMAL
UV RADIATION PROTECTION PROVIDED BY BEARDS AND MOUSTACHES” Radiation Protection Dosimetry, 2012.