Amazon has a new searching method that allows for searches inside of various books. It does not search through ALL books, of course. As an example, I tried "look and say sequence" Elementary Number Theory in Nine Chapters by James J. Tattersall (Author) (Paperback - December 1999) Excerpt from page 23: ". . . to the previous term and reversing the digits. Properties of look and say sequences were developed by John H. Conway at Cambridge University. For . . ." And then I tried "heptominoes" The Theory of Gambling and Statistical Logic by Richard A. Epstein (Editor) (Paperback - March 1995) Excerpt from page 367: ". . . applica- tions. There are, for example, 35 hexominoes and 108 heptominoes, one of 1 1 2 3 t Tyrne Products, . . ." The A to Z of Mathematics: A Basic Guide by Thomas H. Sidebotham (Author) (Paperback) Excerpt from page 339: ". . . of seven squares joined together. There are 108 types of heptominoes, including one with a "hole," shown in figure e. (e) . . An interesting tool. --Ed Pegg Jr.