What If? : Serious Scientific Answers to Absurd Hypothetical Questions by Randall Munroe
My rating: 5 of 5 stars
XKCD (i.e., Randall Munroe) addresses questions of all kinds in his inimitable fashion. Great fun and an inspiration in the spirit of Richard Feynman, allowing you to marvel not only at the author’s answers but the sheer inventiveness of the questions (including the “weird and worrying” ones. Highly recommended.