Scientists may have found the great, great, great, etc., grandfather of the famous fossil Lucy. A new partial skeleton of an early hominid known as Australopithecus afarensis was discovered in a mud flat of the Afar region of Ethiopia. Dated about 3.6 million years ago, the find is about 400,000 years older than the famous Lucy, which was among the earliest upright walking hominids, researchers report in Tuesday's edition of Proceedings of the National Academy of Sciences. The bones indicate this ancestor also walked upright, but was considerably larger than Lucy, who stood about 3.5 feet tall.