This book's cover looks cutesy and a little fluffy, but the content is actually quite insightful. Wiking goes in-depth about quantifying qualitative data around happiness. He has created an approachable compendium of data and insights from studies in Copenhagen and beyond, with content that expands beyond just happiness. 

I listened to the audiobook of this read by the author, and i think I'll buy a copy of this to refer back to in later times.