ARTIFICIAL LIFE: The Quest for a New Creation.
By Steven Levy. Pantheon. 390 pp. $25
COMPLEXITY: The Emerging Science at the
Edge of 'Order and Chaos. By M. Mitchell Waldrop.
Simon &Â Schuster. 380 pp. $23
COMPLEXITY: life at the Edge of Chaos. By
Roger Lewin. Macmillan. 208 pp. $22