Amazing site. I was reading through some old posts and came across this one about the purpose of arm and leg hair.
You often hear people saying that we have body hair to keep us warm when they stand on end. I'm certain I've heard of a study somewhere that this is vestigial and is ineffective in heat retention in humans.
Ever since studying parasites at university I have become convinced that we have retained these hairs as a mechanism to detect parasites that land on us as they attempt to feed or enter. They brush against the hairs thus alerting us to their presence and it gives us a chance to swat them away.
Does this seem reasonable? Do you know of any studies to support this idea? Anecdotally I do seem to get more mosquito bites on my knuckles and the hairless parts of the back of my fingers than on the rest of my hand (rarely the palm though - I assume the skin is too tough).
Any thoughts are greatly appreciated as always.