"SELF-HELP Personal Growth Happiness." . . "Electronic books"@en . "What happy people know : how the new science of happiness can change your life for the better" . . . . . . . . . . . . . "Profiles unhappiness as a chemical brain response that helped early humans survive, offering advice on how to achieve happiness by retraining brain activity, accepting a painful past, and designing a future." . "Profiles unhappiness as a chemical brain response that helped early humans survive, offering advice on how to achieve happiness by retraining brain activity, accepting a painful past, and designing a future."@en . "What happy people know : how the new science of happiness can change your life for the better"@en . . .