http://en.wikipedia.org/wiki/Tunguska_event
http://earthsky.org/space/what-is-the-tunguska-explosion
http://history1900s.about.com/od/1900s/qt/Tunguska.htm
http://www.guardian.co.uk/theguardian/from-the-archive-blog/2013/feb/08/tunguska-asteroid-comet-1908-Siberia
http://news.nationalgeographic.com/news/2007/11/071107-russia-crater.html
Videos
http://www.youtube.com/watch?v=EiXpp-i442s
http://www.youtube.com/watch?v=BZSRqtXKaq8
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