The Rich Are Not Who We Think They Are. and Happiness Is Not What We Think It Is
nytimes.com
nytimes.com
There is also a good podcast episode with an interview by Steven Levitt with the author ( https://podcasts.apple.com/au/podcast/75-self-help-for-data-... )
It might be of interest to HN types because it's essentially using loads of data to see what helps people.