People fly to the moon, create nanotechnology and "internet on computers" with instant communication globally. What the heck, i cannot believe, but this seems to be the case! Such a simple issue and humanity just does not know....... what is the exact purpose for men facial and body hair? When it comes to hair on our scalp and genital hair... every man AND woman has them to protect the brain and genitals from excess cold or excess heat. But arms, face or legs? I want a scientific paper or explanation what is the biological purpose of it.