What If? is a 2014 non-fiction book by Randall Munroe, creator of the webcomic xkcd, in which he provides serious scientific answers to absurd hypothetical questions submitted by readers
. The book uses mathematics, physics, and cross-disciplinary science to explore unusual scenarios, often involving "back-of-the-envelope" calculations and computer simulations to reach logical conclusions
. The questions range from bizarre to thought-provoking, such as "What would happen if you tried to hit a baseball pitched at 90% the speed of light?"—which Munroe answers with a detailed explanation involving a nuclear fusion explosion and a humorous ruling of "hit by pitch"
. The book is known for its witty tone and stick-figure illustrations that complement the scientific explanations
. What If? is structured as a collection of these Q&A style essays, interspersed with sections titled "Weird (and Worrying) Questions from the What If? Inbox," which Munroe sometimes chooses not to answer due to their disturbing nature
. The book is accessible and entertaining, making complex scientific concepts understandable and enjoyable for a broad audience, including curious readers and fans of xkcd
. In 2024, a sequel titled What If? 2 was also released, continuing the tradition of answering more absurd hypothetical questions with scientific rigor and humor
. In summary, What If? is a clever and engaging book that combines humor, science, and imagination to explore "what if" scenarios that are both bizarre and fascinating
