An international team of archaeologists and paleoanthropologists has discovered a large collection of 2-million-year-old stone tools, fossilized bones and plant materials at the site of Ewass Oldupa in the western portion of the ancient basin of Olduvai Gorge (now Oldupai) in northern Tanzania. The discovery reveals that the earliest Olduvai hominins used diverse, rapidly changing environments that ranged from fern meadows to woodland mosaics, naturally...