Recent fossil discoveries in Africa have shed new light on the ancestry and evolution of man. Guest Dr. L.S.B. Leakey, renowned British anthropologist and paleontologist, unearthed fossil remains in the Olduvai Gorge that have extended the time scale of human evolution from 500,000 to two million years or more. A deductive story in anthropology and paleontology is told as Dr. Leakey describes his finds and interprets their significance