Shirley Ann Jackson is past president and Chairman of the Board of AAAS and president of Rensselaer Polytechnic Institute, Troy, NY. This essay is adapted from her presidential address at the AAAS annual meeting in February 2005.
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Science 09 Dec 2005: Vol. 310, Issue 5754, pp. 1634-1639 DOI: 10.1126/science.310.5754.1634