<http://schema.org/url>
<http://www.technologyreview.com/view/426487/best-of-2011-billion-ton-comet-may-have-missed-earth-by-a-few-hundred-kilometers-in-1883/>
<http://www.technologyreview.com/view/426487/best-of-2011-billion-ton-comet-may-have-missed-earth-by-a-few-hundred-kilometers-in-1883/>