Will Hart may be a nice fellow, but his facts are not right. I stopped reading when I got to the part when he said the people in the Nova show couldn't raise the oblesk.
I remember that show well. Some European types had a hair-brained scheme to use ropes and a wooden frame to raise the stone block. All attemps failed. But then an American engineer in Mass. did succeed using something Egyptians have a lot of: sand. See here:
http://www.pbs.org/wgbh/nova/egypt/dispatches/990827.html
No great mystery. It's a mistake to underestimate the ingenuity of the human mind. Now or then.