Recent fossil discoveries in Africa have shed new light on the ancestry and evolution of man. In the Olduvai Gorge, Kenya, Dr. L.S.B. Leakey, renowned British anthropologist and paleontologist and a guest on this program, has unearthed fossil remains 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.