A letter from the Paleoanthropology Division of the Smithsonian Institute: "We have given this specimen a careful and detailed examination, and regret to inform you that we disagree with your theory that it represents 'conclusive proof of the presence of Early Man in Charleston County two million years ago.' Rather, it appears that what you have found is the head of a Barbie doll, of the variety one of our staff, who has small children, believes to be the 'Malibu Barbie.'"
Update: Not that there was any doubt that this isn't a real letter, here's the confirmation. (thx, sam & sheldon)