The guide "What if? What Would Happen?" by Randall Munroe offers a fascinating collection of answers to questions that many people probably never thought to ask. Munroe combines science with creativity to illuminate quirky and unexpected inquiries. For example, it explores how many people would be needed to meet the daily caloric needs of a Tyrannosaurus or what it feels like to swim in a lunar lake. The new edition includes additional chapters and is illustrated with the author's characteristic line drawings, which entertainingly complement the text. This book is not only informative but also an original source of entertainment that encourages readers to think and brings a smile to their faces.