This is the second collection of A. K. Dewdney"s popular "Computer Recreations" columns, drawn from "Scientific American". The author discusses some of today"s hottest topics including chaos, computer viruses, and artificial landscapes. The computer recreations described here range from purely entertaining brain teasers to more practical computer applications of scientific thought. 26 programs are included that require only moderate programming skills. There are Mathemagical movies, a miniature universe, puzzles, wordplay, and simple programs that produce striking effects. Dewdney"s clear directions allow homecomputer owners to sit at the computer and try each one of them.