AOL (a competitor to Google) released around 35 million search queries, done by American citizens during 2006, to the public. (See AOL Data Leak). A fraction of this data (but still a lot of data) was, for different reasons, written as full English sentences. Some of it was questions and some of it fragments or statements, and such.
The book is the result of an automatic process of combining answers with questions using word matching: If a word exists in both the question and the answer, they are paired together. Such as "Why are gas prices so high?" - "Because I got high". The result is a 600 paged book with around 2000 questions answered with 1-20 answers each.
