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"Best of 2011: Billion-Ton Comet May Have Missed Earth by a Few Hundred Kilometers in 1883"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.technologyreview.com/view/426487/best-of-2011-billion-ton-comet-may-have-missed-earth-by-a-few-hundred-kilometers-in-1883/>