just got done reading this last week. very interesting read, hancock connects alot of different aspects of humanity with psychedelic experiences. he tends to repeat himself which can get annoying but i suppose he decided it was necessary because he backtracks alot in the book. the whole book is pretty speculative but graham hancock cites a wealth of interesting facts to back up his theories. i wish he got deeper into some aspects and did get pretty drained reading about all the goddamn cave art near the beginning of the book, but overall i enjoyed it alot.