SELECTIONS FROM SCIENTIFIC AMERICAN MAY 1997 ARTICLES New Chemical Tools to Create Plastics Humankind's Effects on Global Climate NEWS AND ANALYSIS In Focus What Did 'Dolly' Start? Science and the Citizen Vanishing Worlds The Sinister Cosmos False Memories Scent Prospectors By the Numbers: Female Illiteracy In Brief Technology and Business Chip Challenge Magnets Without Metal Saving With Solar Cerebral Pacemaker Cyber View World Wide Widgets Profile Alan Cocconi--from EV's to Pterosaurs THE AMATEUR SCIENTIST Haze Gauge REVIEWS Portrait of a Pathogen Briefly Noted COMMENTARIES CONNECTIONS: Stones and Bones WONDERS: HOH and Life Elsewhere FROM THE EDITORS 50, 100 and 150 Years Ago Letters to the Editors