I have read a number of books on happiness -- Bertrand Russell's and one of the Dalai Lama's among them -- and have learned a great deal from them. Uniquely, as well as providing interesting thoughts and ideas, Desmond Morris's book actually made me FEEL happier and more optimistic for the future too -- both for me personally and for humanity. I looked for a way to send him a thank-you email but have given up for now. ** Dr. Morris, I think you are unlikely to read this, but if by some chance you do, I would like to thank you for a wonderful book.** To go back to sharing my thoughts with potential readers, the author is clearly a man who has actually experienced a huge amount of happiness in his life (whatever else besides) and really KNOWS what he is talking about. This in addition to having a theoretical perspective based in a Darwinian evolutionary view of man that correctly emphasizes the body, food, sex and love. I don't think you have to agree with Darwin or be a materialist to enjoy the book and have its hope for the future and practical ideas improve your state of mind. The spiritual question can remain open, or you can be spiritual as well as Darwinian. I think what contributed so much to me feeling my happiness level genuinely raised by reading this book (admittedly this happens to be a good time in my life too, so the background is right), is the author's life-loving attitude, wide sympathies, wide perspective on the sources of happiness (he writes movingly on the value of intellectual board games and other "pointless" activities), deep humanity, and genuine concern to help others become happier. It is also significant that he does not at all ignore the sources of deep unhappiness in many people's lives (e.g. mindless work, lack of scope to live in a fulfilling way, and over-large societies that cause us to emphasize competition over cooperation -- while accepting that competition is natural and can be good too), explains the tragedy of this, and shows how this came about and why it is not how things should be or have to be in the future -- if only we collectively can do the right things with the resources we now have. It is a short book, not the best for learning about Darwinian theory or the history of humanity. Certainly there were details I could question. And the one reservation I have is about the author's generally positive view of prostitution as a source of sensual happiness. No doubt, e.g., van Gogh's life would have been sadder without this possibility, but we need to remember that for many women who become prostitutes (if, perhaps, not all) it is a really bad option coming out of a miserable background. And often not even a choice. The book is about enhancing life and happiness and seeing the way forward for oneself and our societies, which also gives a framework for the direction we need to go in and what needs to be done, if not the details of how to do it.