Chimpanzees Have Not Entered The Stone Age

Unlike early human species, chimpanzees do not seem to be able to spontaneously make and use sharp stone tools, even when they have all the materials and incentive to do so. That was the finding of a study of a total of eleven chimpanzees at a zoo in Kristiansand, Norway, and Chimfunshi Wildlife Orphanage, a sanctuary in Zambia....