what if...?

Millions of people visit XKCD.com every week to read Randall Munroe's comic strip. His simple figures and minimalist drawings about science, technology, love, and the meaning of life have a vast following.
Fans of XKCD ask Munroe many bizarre questions. What if you tried to hit a baseball pitched at 90% the speed of light? If there was a robot apocalypse, how long would humanity last on Earth?
In search of answers, Munroe runs computer simulations, analyzes confidential military research dossiers, solves differential equations, and consults nuclear reactor operators. His answers are works of art of insight and humor and usually predict the absolute annihilation of humanity or an unimaginable explosion that destroys everything!
What If…? is essential reading for all those who love the great enigmas of life, science, and, of course, questions as absurd as they are entertaining.