What If? 2: Additional Serious Scientific Answers to Absurd Hypothetical Questions

Picked this up after the first one blew my mind, and Randall Munroe is still the king of making absolute chaos sound perfectly logical. I spent an entire hour laughing about the logistics of filling the solar system with tomato soup and how it would inevitably turn into a massive black hole. As a physics nerd, I appreciate that he doesn’t skip the math, yet he manages to keep it accessible for people who haven't touched a calculator since high school. The stick figures are as charming as ever, providing the perfect visual punchline to scenarios that would otherwise be terrifying, like the Earth spinning so fast it shreds itself. It’s the ultimate coffee table book for curious minds. Truth is, you don’t even need to read the first one to dive into these chapters. It’s just pure, unadulterated nerd joy that explains the 'why' behind the 'what' in the most hilarious way possible.

Wil Wheaton’s narration on the audiobook version is an absolute masterclass in geeky delivery. He clearly loves the material, and hearing him chuckle during the more ridiculous segments about pigeons lifting skyscrapers made the whole experience feel like a conversation with a funny friend. I did have to grab the ebook as well just to see the comics, because you really can’t get the full Randall Munroe experience without those iconic stick figures. The way he breaks down complex planetary motion or gravitational pull into bite-sized, hilarious scenarios is brilliant. It makes science feel approachable and, more importantly, fun. Whether you're a hardcore science buff or just someone who likes to imagine what would happen if the moon were made of cheese, this book delivers. It's rare to find something that is simultaneously this educational and this entertaining.

Finally got around to reading this and I can confirm that Randall Munroe is a national treasure. The sheer amount of effort that goes into answering questions like "What if Earth was a massive eyeball?" is staggering. Most people would just give a joke answer, but he actually sits down and calculates the biological and gravitational implications. Frankly, it’s the most fun I’ve had with a non-fiction book in years. The prose is snappy, the jokes in the footnotes are top-tier, and the drawings add that perfect xkcd flair. It’s one of those rare books that you can open to any random page and immediately be sucked into a fascinating rabbit hole of science. It’s incredibly readable for such a data-heavy book, which is a testament to Munroe’s skill as a writer. If you have even a passing interest in how the universe works, buy this immediately.

Not what I expected for a 'science' book, but I am absolutely obsessed with the tone of this. It’s basically what happens when you give a brilliant physicist a bunch of crayons and some very weird emails from the internet. The scenarios are so absurd—like the soup-filled solar system—that you can't help but laugh out loud. I started reading a few chapters to my nephew, and now he’s obsessed with the idea of a T-Rex roaming New York. It’s a brilliant way to get kids interested in physics without them even realizing they’re learning. Personally, I found the footnotes to be the best part; they’re packed with extra jokes and snarky comments that show Munroe’s personality. It’s lighthearted, deeply researched, and just plain fun. If you enjoyed the first one, there’s no reason to hesitate on this. It’s a five-star follow-up.

Randall Munroe has this incredible knack for taking the most ridiculous premises and treating them with absolute scientific reverence. Whether he’s discussing the catastrophic effects of speeding up Earth's rotation or the caloric needs of an urban dinosaur, he never talks down to the reader. The truth is, I learned more about centrifugal force and black holes in two chapters of this than I did in a semester of college physics. The humor is dry and perfectly matched with the minimalist stick-figure art style we all know from xkcd. It’s such a satisfying read because it rewards curiosity with actual data, even if the data is about how tomato soup would crush the universe. It’s an amazing gift for any nerd, but it’s also just a great book for anyone who wants to see the world from a slightly skewed, much more interesting perspective.

The chapter on T-Rex calorie intake was exactly the kind of weirdly specific content I was looking for. Randall has this unique ability to take a question that sounds like it was asked by a toddler on a sugar high and treat it with the rigorous scrutiny of a NASA scientist. While I loved the humor and the xkcd-style illustrations, there were a few moments where the calculations went a bit over my head. To be fair, I’m not a bioengineer, so I found myself skimming the heavier physics blocks to get back to the funny footnotes. Even with the occasionally dense jargon, the book is incredibly thought-provoking and stays grounded in real-world logic. It’s a great gift for anyone who likes 'useless' facts that are actually deeply fascinating. I do wish some of the shorter answers had a bit more meat on their bones, but it's still a solid follow-up to the original.

Ever wonder what happens when you use an arc welder as a defibrillator? According to this book, you probably shouldn't even be allowed to own the welder in the first place! That kind of dry, witty humor is what makes "What If? 2" such a joy to read. It’s effectively a manual for things you should never do, explained through the lens of a brilliant former NASA roboticist. The research is surprisingly deep, covering everything from relativistic speeds to how many bones you can lose and still survive. It’s a fantastic gift for kids who are constantly asking "why?" or for the adult nerd in your life who has everything. My only tiny gripe is that a few of the questions felt like retreads of themes from his blog, but the new illustrations make it worth the price. It’s light, engaging, and will definitely make you the most interesting person at your next dinner party.

This book made me feel incredibly smart and incredibly dumb at the same time, which is quite an achievement. I love the wacky, science-based approach to things like Japan leaving the planet or pigeons causing a gravitational shift. Randall’s writing style is so engaging that I found myself nodding along to math I barely understood. To be fair, some of the sections on relativistic collisions are a bit dense, but the payoff is usually a hilarious stick-figure drawing of a catastrophic explosion. It’s a wonderful example of how to make STEM education actually exciting for the general public. While it’s essentially more of the same from the first book, I don't see that as a bad thing at all. It’s a money machine that works because the content is genuinely high-quality. Great for a quick laugh or a long, deep dive into the 'what if' scenarios that keep us up at night.

After hearing so many people rave about Munroe's blog, I decided to jump straight into this sequel. The good news is that you don't need to have read the first "What If?" to enjoy this one. Each chapter is a standalone piece of scientific madness. I was particularly fascinated by the section on how many pigeons it would take to lift someone, though the math did get a bit dizzying toward the end. Not gonna lie, I was a little bummed by a few of the 'short answers' which felt like they ended right as the science was getting juicy. However, the overall package is so entertaining that it’s hard to complain too much. The book is physically beautiful and the illustrations are iconic for a reason. It’s a solid 4-star read that will definitely satisfy your curiosity about the weirdest corners of reality.

As someone who loved the first book, I found this sequel to be a bit of a mixed bag. The humor is definitely still there, and Munroe’s imagination is clearly boundless, but some of the explanations felt much more technical this time around. Look, I’m a nurse, and I’m used to explaining complex medical concepts in simple terms, but I found myself getting lost in the weeds of the physics equations here. I really wanted to understand why the solar system soup scenario ends time, but the breakdown was a little too jargon-heavy for a casual reader like me. The short answers were also a bit disappointing because they felt like they ended right when they were getting interesting. It’s still a fun read for the cartoons and the general vibe, but it lacked the perfect balance that made the first one so accessible.