This book was made by Randall Munroe, the same guy who made XKCD.com.
The book contains many questions from the what if section of XKCD, and answers to all of them.
Questions include:What would happen if someones DNA vanished? And:How many arrows would it take
to blot out the sun?
This was a really cool book with answers I never thought I would need until I saw the questions. I hear the US edition is coming out soon!
I would give it ten out of ten stars!