Alien Books and Theories
There are many different theories in this world that are hard to believe. We have also learned a lot about our world from theories. There is much different kind of theories. Some of these are mathematical theories, .
We all know the great Pyramids of Giza and Khufu and the Pyramid of Cheops, and we also might have knowledge about the pyramids of the Mayans, but in recent times, due to the effects of global warming, a few .