I still think it was them space people and their anti-gravity stuff. But seriously, (hey,, with the Egyptians, could use Siriusly) still begs the question of how did they get the blocks from the quarry to the boats, then from the boats to the pyramid. To transport those blocks, must have been some pretty heavy-duty boats - could any of our's do the same?
Despite not having access to fossil fuel run engines, modern medicine, and other sciences our ancestors were in fact pretty robust when it came to improvising. I believe that archaeologists think that the ancient Egyptians used a complicated pulley/lever system to get the massive blocks of stone to stack on top of one another. As for using the Nile to transport them from the quarry site to the actual site they'd use for the building of the Pyramid, that's rather ingenious. 😀