Have you ever wondered what would happen if you tried to hit a baseball pitched at 90% the speed of light? Or if everyone on Earth jumped at the exact same time? 'What If?' takes your wildest, silliest questions and answers them using real, serious science. Author Randall Munroe, a former NASA roboticist, combines hilarious stick-figure comics with rigorous physics, chemistry, and biology to explore the hilarious and sometimes terrifying consequences of hypothetical scenarios. This book turns curiosity into an adventure, showing that science is the ultimate tool for understanding our weird and wonderful world.