A book that makes you “think/ponder”?

A woman in my family wishes for such a book. She’s recently turned 71, is a very active & fit woman, rather intelligent and well travelled/studied/read.

The semi-direct, translated to English, description she gave me was; “A good book to get more knowledgeable by/with, and to have one’s horizon expanded” to help her out of the everyday grind and not get ‘stuck’ in one’s daily loop. “Not a cookbook or kreative challenge per say, but more ‘contemporary’, something that really gets your brain grinding with ponder and thought”

I feel like this sub might be a good place to give recommendations, as I think this guideline opens up to many different kinds of genres, and vastly different author styles can fit perfectly in, in each their own right.