Olduvai Gorge, the archaeological site also known as "The Cradle of Mankind”, is a steep-sided ravine in the Great Rift Valley that stretches through eastern Africa. It is in the eastern Serengeti Plains in northern Tanzania and is about 48 km (30 mi) long. It is located 45 km from the Laetoli archaeological site. The name is a misspelling of Oldupai Gorge, which was...