It was Mary's 1959 discovery of the Zinjanthropus cranium at Olduvai that captured worldwide attention and made the Leakeys a household name.

Following the success of Zinjanthropus, Louis began spending less and less time at Olduvai, which became Mary's domain.

He was sure that Zinjanthropus was a toolmaker because crude stone tools were found near his remains.

He now believes that Zinjanthropus was an Australopithecine, a nonhuman vegetarian of low intelligence and not a toolmaker.

Despite his small brain size, he had a fairly high forehead, not a flat one like that of Zinjanthropus.