Happy Birthday, "What if ..?"! The special edition celebrating the 10th anniversary of the worldwide bestseller by superstar Randall Munroe - featuring brand new illustrations, updated and as delightfully crazy as ever, annotated by the master himself!

Fans of the popular webcomic "xkcd" pose the most impossible questions to Randall Munroe: What would happen if you tried to hit a baseball thrown at 90 percent the speed of light? What if all humans suddenly disappeared from Earth? And what happens to Earth when the sun goes out?

Randall Munroe answers with high-level science and stunning creativity. He conducts computer simulations, solves differential equations, and examines unusual objects under extreme physical conditions.

In celebration of the 10th anniversary of "What if," the master of absurd-hypothetical science has revamped his blockbuster and amplified the adventure tenfold. This anniversary edition offers even more fun with witty annotations, comments, and brand new two-color illustrations. A must-have for all Munroe fans and admirers of original entertainment at the highest level!.