What If? deals with the absurd questions that Mr. Munroe receives on a section of his website, which is primarily known for hosting his webcomic XKCD. Questions include what would happen to you if you started to rise at the rate of one foot per second and what would happen if the Moon disappeared.
While the questions themselves are absurd, Mr. Munroe works through the logic and maths in a serious way, which results in some surprising insights. His trademark irony and delightfully witty foodnotes make for a very enjoyable read.
How-To tackles seemingly mundane problems like “how to dig a hole”, “how to cross a river”, or how to move house”, but takes them to absurd and hilarious extremes. For example, the moving house chapter includes a calculation of how far you could fly your house if you mounted jet engines to it.
Mr. Munroe is the author of the famous webcomic XKCD, and he brings his unique perspective to this very funny book. One key aspect which makes this book transcend mere humour is that the underlying science is basically sound. While it may not be possible to deploy a field of teakettles to boil a river in order to cross it (yes, that is one of the solutions considered), the consequences of the heating are calculated and described with as much accuracy as possible.