PHILIP COPPENS has tackled the Ancient Alien (Intervention Theory) with a compendium of theories and facts from around the world. While he tells of well known theories such as Erich Von Daniken's Nazca lines and Sitchen's Nibiru, he also talks about little known facts that seem to prove some form of ETs helped created human intelligence. Coppens points out there are two billion earth like planets in the milky way alone, and 50 billion more in the known universe. He gives little known information concerning the crystal skulls, the puma punka stones of the Inca's, the Vimanas of India, and the scientific  evidence that  the composition of the Great Pyramid in Egypt is manufactured of polymer (which would explain the precision engineering, and that they were not transported from quarries miles away. While he presents a huge amount of evidence that someone or some thing intervened in our development, he leaves the door open for you to disagree.