A.K. DEWDNEY, PH.D., is the author of several critically acclaimed math and science books, including A  Mathematical Mystery Tour; Yes, We have No Neutrons; and 200% of Nothing, all from Wiley. He was a member of the computer science  department at the university of Western Ontario and at the university of Waterloo for a combined period of thirty years before retiring. In 1996, he became an adjunct professor of biology at UWO. For eight years, Dewdney was the  computer Recreations columnist  for Scientific American magazine.