Sci-Fi & Speculative

What If? Serious Scientific Answers to Absurd Hypothetical Questions

by Randall Munroe

Randall Munroe, creator of the webcomic xkcd, answers absurd hypothetical questions with rigorous scientific analysis and stick-figure illustrations. What if you tried to hit a baseball pitched at 90% the speed of light? What if everyone on Earth aimed a laser pointer at the Moon at the same time? Physics, biology, and engineering deployed in service of gleeful curiosity.

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