When I'm on vacation I like nothing more than reading history books; it really helps transport you to another time and place, helping you to disconnect from the present and immerse yourself in your vacation.

Closer to home, surely there are work books that can teach you something new? I just picked up a fantastic academic tome called Experimental Economics by John List, to learn more about running experiments. https://press.uchicago.edu/ucp/books/book/chicago/E/bo250610...