No rating. This is, as billed, a book of puzzlers and problems. Unlike most amusement books, this one requires some higher level math - most probability theory or calculus. Still an interesting read. Written in a time when "source code" was not easily available, so it's printed in several pages in the book instead. I do not agree with others who way this is poorly written - there's no narrative, but it's a book of puzzles! Will read at least one more book by this author - [b:An Imaginary Tale: The Story of "i" the square root of minus one |357209|An Imaginary Tale The Story of "i" the square root of minus one |Paul J. Nahin|http://photo.goodreads.com/books/1174061382s/357209.jpg|347370]