More and more discoveries and studies show that our history is not what we believed it was. There were prehistoric civilizations and societies with far more technological advancement than ours.
Many primitive and nomadic societies all around the world saw rapid improvements. According to one theory, this is due to the infiltration of an alien civilization, or perhaps multiple alien cultures or races.
They carried with them knowledge of advanced technology, laying the groundwork for modern civilization.
It is simple to obtain this conclusion by looking at some old monuments, such as the pyramids, and observing that the technology required for their creation exceeds our own.
There is evidence of these ancient and mysterious structures all over the world, not just in Egypt, and they all support the theory that an ancient extra-terrestrial race arrived on Earth thousands of years ago and provided primitive cultures with the technology needed to build the aforementioned pyramids, Stonehenge, and many other ancient artifacts.