0.32 Philip Lieberman Edmund S. Crelin Dennis H. Klatt, Phonetic Ability and Related Anatomy of the Newborn and Adult Human Neanderthal Man and the Chimpanzee, American Anthropologist, 1972.

{ human behavior evolution social }	0.32
{ number data group table }	0.17
{ language linguistic languages speech }	0.15
{ skull teeth index head }	0.12