The coevolution of man's neural structures and his tool traditions has been a constant point of investigation since the time of Charles Darwin. Author looked at evidence demonstrating this positive correlation and readdress this point of study with some new evidence from archaeological sites in Africa that have yielded both hominid crania and tools. He also looked at the possibility of hand preference as early as the australopithecines and early members of the species Homo habilis, who some feel is human earliest ancestor, as opposed to Australopithecus africanus.