Hallucinogens such as magic mushrooms and DMT may have been responsible for the wondrous cave art of the Upper Paleolithic, and even ultimately the rise of modern human behaviour. That's the opinion of Graham Hancock, the best-selling author of 'Fingerprints of the Gods', who is famed for his alternative ideas about ancient history. In his new book 'Supernatural', Hancock explores the 'neuropsychological model' of cave art, proposed by South African scholar David Lewis-Williams. In this theory, which is now gaining wide acceptance, geometric symbols and drawings of therianthropic beings are equated to the visions seen by shamans while in altered states of consciousness.As part of the research for his book, Hancock ingested both psilocybin mushrooms and ayahuasca - the shamanic brew of the Amazonian jungle. His experiences led to him to question the current paradigm's conception of what 'reality' is composed of, and how we as humans have discovered new ideas and evolved our thinking. He points at the strange fact that Frances Crick - the discoverer of the double-helix structure of DNA - made his breakthrough in a sudden instant of realisation while under the influence of LSD.In a wide-ranging interview in 'Sub Rosa' magazine (http://subrosa.dailygrail.com), a free PDF magazine designed to professional standards, Hancock decried the current laws regarding psychedelic drugs. "It's absurd and crazy", he said, "in countries which call themselves advanced and democratic, that there should exist medieval laws that will send people to prison for years, simply for exploring their own consciousness."Other parts of the book explore the alien abduction phenomenon in the spirit of Jacques Vallee's pioneering investigation in 'Passport to Magonia', as well as the idea that our DNA may carry a message designed by our creator - whoever that is.