GRAPHIC BY LON TWEETEN; TEXT BY KRISTINA DELL; WEB VERSION BY JAMES JOHNSON
FROM THE MAY 24, 2004 ISSUE OF TIME MAGAZINE; POSTED WEDNESDAY, MAY 19, 2004

SOURCES: CHRISTINE SIMON AND JOHN COOLEY, UNIVERSITY OF CONNECTICUT; GENE KRITSKY, COLLEGE OF MOUNT ST. JOSEPH; KEITH CLAY, INDIANA UNIVERSITY; NATIONAL GEOGRAPHIC; CICADAMANIA.ORG

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