Aliens or Man,Who Built the Great Pyramid at Giza?

Is it really possible that ancient Egyptians built the Great Pyramids, or were they aided by extraterrestrial intervention? This paper will look at both sides of this controversial subject.
The Khufu pyramid, also know as The Great Pyramid, is the largest of three pyramids in the Giza plateau. No one knows exactly when it was built, but archeologists believe that it was built around 10,000 BC through 2500 BC. The limestone blocks used to build the 481-foot tall structure were most likely quarried near the Giza plateau. There is a large pit near by, and the amount of missing stone is slightly larger than that of the Khufu pyramids estimated volume. Scientists estimate that the pyramid is composed of 2.5 million limestone blocks each weighing approximately 2.5 tons each for a grand total of 6.3 million tons.
The ancient historian, Herodotus, visited the pyramids in 449-430 BC he was told by the temple priests that the pyramids were built using a lever and fulcrum based machinery. ...