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PHOTOGRAPH BY HEINZ KLUETMEIER

Butterfly Effect

MICHAEL PHELPS set a world record in the 400-meter individual medley final last Saturday to claim the first of what he hoped would be eight gold medals in Athens; that quest was derailed the next day, when South Africa set a world record in winning the 4√ó100-meter freestyle relay, in which Phelps and his U.S. teammates took the bronze.