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U.S. Output Flattens, and NSF Wonders Why

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Science  03 Aug 2007:
Vol. 317, Issue 5838, pp. 582
DOI: 10.1126/science.317.5838.582

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A new study by the National Science Foundation reveals what NSF officials call an "unprecedented" and mysterious trend: Despite the continued expansion of the peer-reviewed literature, the total output of U.S. scientists stopped growing in the early 1990s and hasn't budged since then.