Hands down, the most fascinating book I read in 2021 (and I will have read for a long time!) is "The Information: A History, a Theory, a Flood" by James Gleick: https://www.amazon.com/dp/1400096235
Those who have a computer science background will almost definitely love the book. It connects many dots that are previously seemingly unrelated. My jaw dropped for literally every few pages of most chapters.