In fact, watching that program firmly convinced me that they don't have a clue as to how something like the Cheops Pyramid was really built. It was kinda like watching a Clinton defender try and refute the facts of his criminality adopting the most outrageous twists to deny the obvious.
Saying that does not mean I believe it was built by aliens.
The Olmec heads are clearly negroid.
Would'nt an alien race and/or advanced civilization have known how to build the ceiling of the kings chamber? As I understand it there were apparently flaws in the initial design, a broken 'roof stone' and an ugly kludge for reinforcement.
Without a doubt. The oldest dated human skeleton ever found in the Americas (Brazil) is of a Negroid woman (Luzia) who died at about 24 years of age. The skeleton has been dated at 11,500 years old. There is another skeleton (Arlington Springs Woman) found on an island off the coast of California that is expected to date older than 'Luzia.'