There is no unified pseudoarchaeological theory or approach, but rather many different interpretations of the past that are jointly at odds with those developed by the scientific community. Some of these revolve around the idea that prehistoric and ancient human societies were aided in their development by intelligent extraterrestrial life, an idea propagated by those such as Swiss author Erich von Däniken in books such as Chariots of the Gods? (1968) and Italian author Peter Kolosimo. Others instead hold that there were human societies in the ancient period that were significantly technologically advanced, such as Atlantis, and this idea has been propagated by figures like Graham Hancock in his Fingerprints of the Gods (1995).