This book uses scientific 'evidence' like it was written in the 50s. While the concepts are modern, the gaps in logic and supportive evidence are inexcusable. Even the 4 'fundamental' drives seem arbitrary. Halfway through, I realized I had yet to encounter anything I could consider a 'fact' - the entire book is one long, rambling, overextended theory. I skimmed the rest and a series of nonsensical 'diagrams' cemented my opinion; not worth finishing.