Hey, I'm working on the theories for how the pyramids in Egypt were built and I just wanted to know if you guys had any other points to add to what I have written. The first theory is that Aliens built them because they were so precise. The raitio of height to length equaled pi. They pointed to different constalations and to this day, no one has been able to make an exact replica of the pyramids. But, there are no traces of aliens existing, landing on earth etc. The Second theory is that the Egyptian slaves built them. But there are some flaws in this theory because, how were all the workers fed for the 4000 years it took to build them. How did they transport that many stone blocks to the top of the pyramid (which was 4000 ft high). If they had ramps, the slight angle of the ramp would have made the ramp bigger than the pyramids. There was no rope to pulll the blocks up the ramp. As well, trees were scarce in Egypt and were needed for shade and food. Although, they could have imported wood from Alexandria, and floated it down the Nile. The third theory is that they composed a formula of natron and silt in the Nile that would dry as rocks.( Has been tested by scientists.)Therefore they could pour the molds, then put them into the pyramid which would mean they wouldn't have to feed as many workers and wouldn't need the large ramps. But, how can we be sure they had the knowledge to think of this? If you have any imput what so ever on any of these theories I would greatly appreciate it.