Within the genus Homo, cranial capacity again doubled from H. habilis through Homo ergaster or H. erectus to Homo heidelbergensis by 0.6 million years ago. The cranial capacity of H. heidelbergensis overlaps with the range found in modern humans.
The original height of the Pyramid was 146.5 m (488 ft), but today it is only 137 m (455 ft) high, the 9 m (33 ft) that is missing is due to the theft of the fine quality white Tura limestone covering, or casing stones, for construction in Cairo. It is still the tallest pyramid.
Its structure plays on the city's namesake in Egypt, known for its ancient pyramids. It is 321 feet (98m, about 32 stories) tall and has base sides of 591 ft; it is by some measures the tenth tallest pyramid in the world.The Memphis Pyramid has not been regularly used as a sports or entertainment venue since 2004.he Memphis Pyramid has not been regularly used as a sports or entertainment venue since 2004.