Our most powerful 21st-century technologiesârobotics, genetic engineering, and nanotechâare threatening to make humans an endangered species. PHOTOGRAPHS: LEFT: PETER MENZEL; CENTER, TOP TO BOTTOM: GALLERIA DELLʼACADEMIA, FLORENCE/CANALI PHOTOBANK , MILAN/SUPERSTOCK ; TED SPIEGEL/CORBIS; ROGER RESSMEYER/CORBIS; ROGER RESSMEYER/CORBIS; S. MILLER/CUSTOM MEDICAL STOCK ; RIGHT: EVERETT COLLECTION From
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