why do we have so much hair on our head, and legs and around eyebrows and then like none everywhere else?

Question: why do we have so much hair on our head, and legs and around eyebrows and then like none everywhere else?
- Keywords:
  eyebrows,
  hair
Asked by sophiecorteville to Arttu, Ceri, James_M, Monica, Philip on 22 Jun 2011. This question was also asked by antheapryde.
- Arttu Rajantie answered on 21 Jun 2011:
  
  I suppose the hair on our head is to insulate our brain, and the eyebrows are to stop sweat going into our eyes. The fact that we don’t have hair elsewhere could be just because our distant ancestors thought it was prettier and once we started wearing clothes we did not need hair.
- Ceri Brenner answered on 22 Jun 2011:
  
  Arttu’s right. Hair is normally a protective thing, but evolution and clothing has meant that we are way less hairy than we used to be!

Question: why do we have so much hair on our head, and legs and around eyebrows and then like none everywhere else?