This month’s selection is another science book, with a twist. Pratchett’s Discworld has many and varied references. Somewhere along the way, he collaborated with Ian Stewart and Jack Cohen in a series of books with science fused with his fantasy stories. This is the 4th of that group. Quite simply, it blew my mind. There may be more science packed into this book than I learned in my years of school. This type of discussion needs to be included in education programs.