Good comment about dumbing down our ancestors; apparently, they knew a few things about medicine and healing. We should not forget the Neandertal skulls that show marks of trepanning (removing a portion of the cranial skull), with signs if the cut bone having healed. I din't know just what the procedure would have been done for (symptoms, that is), but they apparently had learned the skills with which to pull it off and have the patient survuve.