Ever since I read The River That Flows Uphill at the urging of a family member I've been totally bought into the hypothesis that at some point in time a human ancestor was aquatic (or partially aquatic). I've always wondered why I never heard much about the theory. Heh, I guess I didn't realize that in believing it I had relegated myself to crackpot status. Apparently I am crackpot no more! (Well, maybe just a partial crackpot.) Elaine Morgan has come up with a ton of great answers to why humans look so different from our closest ancestors--why we are naked, why we walk upright, why we've got a subcutaneous fat layer--and all of 'em point to a life in the water.