I agree whole heartedly that the Egyptians never built the Pyramids. I realize that there are many valid theories of how and who built the pyramids. There is one theory that has not been discussed. I believe the Pyramids housed biologicals used in the genetic engineering of Homo Sapiens.
1. In considering EBE's we must consider that EBE's have a much longer lifespan than humans maybe 3 times or more. When dealing with aliens we humans must stop viewing events through our short lives.
2. Rememeber in high school geometry one of the first things taught is that the triangle is the strongest geometrical structure.
3. It would make sense that EBE's would build pyramids (out of stone) considering their long life spans. They needed a structure that would last an extraordinary long time against the different kinds of extreme weather.
4. Foklore has it that in the past when tombs from the pyramids would be opened that the participants would mysteriously die. Could these deaths be the result of some sort of deadly biological virus that the workers were unexpectantly exposed to?
5. I would imagine that Pyramid blocks provided a cool enough environment to keep the biologicals inactive.