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"A Challenge of Numbers" describes the circumstances and issues centered on people in the mathematical sciences, principally students and teachers at U.S. colleges and universities. A healthy flow of mathematical talent is crucial not only to the future of U.S. mathematics, but also as a keystone supporting a technological workforce. Trends in the mathematical sciences' most valuable resource - its people - are presented narratively, graphically, and numerically as an information base for policymakers and for those interested in the people in this not very visible, but critical profession.