Books to have a more holistic understanding of the world.

I have understood the world mostly through the lens of fiction (be it movies or books), whether it is flaws with capitalism, how morality works, and almost every other aspect of life. Now as I grow up, I want to focus my attention on the "why" of it.

So, non-fiction books which help me understand economic inequality, how health works, attention span, etc. would be appreciated (especially these topics, I feel like understanding physics or STEM subjects are not my priority right now, but I am happy to change my mind).

Thanks!