The Happiness Hypothesis by Jonathan Haidt

A truly great book. Haidt intelligently presents myriad findings of social psychological research by focusing on the degree to which they support ten ideas that seem to reoccur in great texts of history (i.e., divided self, reciprocity, love and attachments, the pursuit of happiness…). The result is a highly readable and accessible reservoir of knowledge that has practical applicability to one’s existence.
Happiness = Set point (genetics) + Conditions + Voluntary actions

Everyone should read this book.*

*Those will a psych background will likely find it to be a review, but a good review nonetheless.