The researchers first examined the trabeculae of hand bones of humans and chimpanzees. (sciencedaily.com)
«Discovery of 1.4 million - year - old fossil human hand bone closes human evolution gap.» (sciencedaily.com)
When the team scanned hand bones from four members of A. africanus that lived in South Africa between 2 million and 3 million years ago, they found that the pattern of the trabecular bone was asymmetrical, as in modern humans and Neandertals that use tools frequently (as they also show in their study). (sciencemag.org)