by Ian Stewart A fractal guide to tic-tac-toe.
In African Ceremonies, two intrepid photographers explore the rituals of a disappearing way of life.
WONDERS by the Morrisons Balancing the body's energy needs.
CONNECTIONS by James Burke
ANTI GRAVITY by Steve Mirsky
News & Analysis
The Los Alamos fire's aftermath. 16
Guadalupe, the former Galápagos. 18
Watching cells turn on. 20
The mystery of intergalactic magnetism. 22
Africa's earliest emigrants. 23
Getting serious about laughter. 24
By the Numbers 26 The U.S. population race.
News Briefs 28
About the Cover
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