NAMIBIA: A Late Stone Age site called Leopard Cave has provided the earliest known evidence of domesticated sheep and goats in southern Africa. Alongside stone artifacts and ash, archaeologists found teeth of what were probably sheep dating to up to 2,300 years ago, alongside remains of wild game. It is hoped that further study will determine whether the domesticates arrived with migrating humans, migrated on their own, or were passed south from northern herders by cultural diffusion. —Samir S. Patel