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Source:
Science News. December 17, 2011, Vol. 180 Issue 13, p22, 4 p.
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Popular Science. March 1, 2011, Vol. 278 Issue 3, p64, 4 p.
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The Economist. Nov 30, 2013, Vol. 409 Issue 8864, p79, US p.
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The Economist. Dec 1, 2012, Vol. 405 Issue 8813, p83, US p.
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