Mathematical Recreations

by Ian Stewart A fractal guide to tic-tac-toe.

BOOKS

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

END POINT

News & Analysis

The Los Alamos fire's aftermath. 16

Guadalupe, the former Gal√°pagos. 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

94 96

About the Cover

Painting by Roberto Osti.

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