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http://news.aol.com/article/tunguska-caused-by-comet/546797?icid=main|main|dl1|link3|http%3A%2F%2Fnews.aol.com%2Farticle%2Ftunguska-caused-by-comet...
A really interesting article if your into this kind of stuff. Talks about a blast that occurred a long time ago and that there is almost zero...