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Science  03 Apr 2009:
Vol. 324, Issue 5923, pp. 27
DOI: 10.1126/science.324.5923.27b

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Highlights from Science's online daily news site, Science NOW, this week include a tiny generator that can produce electricity from the mechanical energy produced when our bodies move; research showing that just as preferences influence choices, choices influence preferences; and the benefits of playing video games.