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.
The Great Pyramid was originally 481 feet, five inches tall (146.7 meters) and measured 755 feet (230 meters) along its sides. Covering an area of 13 acres, or 53,000 square meters, it is large enough to contain the European cathedrals of Florence, Milan, St. Peters, Westminster Abbey and St. Paul's.