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From the creator of the wildly popular webcomic xkcd, hilarious and informative answers to important questions you probably never thought to ask.

Millions of people visit xkcd.com each week to read Randall Munroe's iconic webcomic. His stick-figure drawings about science, technology, language, and love have a large and passionate following.

Fans of xkcd ask Munroe a lot of strange questions. What if you tried to hit a baseball pitched at 90 percent the speed of light? How fast can you hit a speed bump while driving and live? If there was a robot apocalypse, how long would humanity last?

In pursuit of answers, Munroe runs computer simulations, pores over stacks of declassified military research memos, solves differential equations, and consults with nuclear reactor operators. His responses are masterpieces of clarity and hilarity, complemented by signature xkcd comics. They often predict the complete annihilation of humankind, or at least a really big explosion.

The book features new and never-before-answered questions, along with updated and expanded versions of the most popular answers from the xkcd website. What If? will be required reading for xkcd fans and anyone who loves to ponder the hypothetical.

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Price Summary

  • We started tracking this book on March 13, 2014.
  • This book was $14.40 when we started tracking it.
  • The price of this book has changed 89 times in the past 4,154 days.
  • The current price of this book is $21.49 last checked one day ago.
  • This book is at its lowest price in the past 90 days.
  • This lowest price this book has been offered at in the past year is $2.99.
  • The lowest price to date was $1.99 last reached on November 23, 2023.
  • This book has been $1.99 3 times since we started tracking it.
  • The highest price to date was $23.99 last reached on April 2, 2025.
  • This book has been $23.99 2 times since we started tracking it.

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Additional Info

  • Publication Date: November 26, 2024
  • Text-to-Speech: Disabled
  • Lending: Disabled
  • Print Length: 320 Pages
  • File Size: 513 KB

We last verified the price of this book about one day ago. At that time, the price was $21.49. This price is subject to change. The price displayed on the Amazon.com website at the time of purchase is the price you will pay for this book. Please confirm the price before making any purchases.