Hypothetical questions can be tantalizing and fascinating. Unfortunately, as is their nature, they often go unanswered. However, Randall Munroe is making a dent in humanity’s knowledge of the hypothetical by answering such questions as: what would happen if you tried to hit a baseball going 90% the speed of light, or could you make a jetpack out of a series of downward firing machine guns?

These questions, along with a host of others, are all answered in Munroe’s witty, entertaining book: What If? Topping off the answers are a slew of often hilarious cartoon caricatures. What If? is likely to have universal appeal whether you’re a NASA scientist (as Munroe was) or you play guitar for a living.

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Learn More: What If?: Serious Scientific Answers to Absurd Hypothetical Questions by Randall Munroe