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Fairly short, but helpful guide starting from basic notions about happiness to actual implementation of it in life. The exercises after every chapter are quite interesting and give a more practical insight into what has been said in the chapter. if you like planning meticulously, this book will suit you!
It's not preachy, and quite realistic except one bit at the end where he is talking about 'happiness revolution' - that was lost on me because it was just...weird. and also saying that capitalism has done nothing to the rates of depression atm was bizarre and could be easily challenged.
that's why 4 stars because otherwise, it's quite an interesting short book.