Observation of the Day: All of the fun parts of life are optional Paul Humour, Mathematics May 2, 2012 1 Minute It comes from XKCD: Forgot Algebra. Click through and mouse over. Share this:FacebookRedditTumblrPocketEmailLike this:Like Loading... Related Published by Paul Reader of books, watcher of films, player of games. British father of three, now living in Belgium and making a living from building interfaces. View all posts by Paul Published May 2, 2012