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About the Cover

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COVER The AAAS Annual Meeting is widely recognized as the world's premier showcase for advances in science, technology, and engineering. The 2007 meeting in San Francisco, 15 to 19 February, will attract more than 10,000 participants, including news media from around the world. Photo: Jupiter Images

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Science. ISSN 0036-8075 (print), 1095-9203 (online)