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San Francisco, 6:20 PM
Wed Dec 30
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The Cloud That Proved The 1908 Tunguska Explosion Was A Comet
The mysterious Tunguska explosion in 1908 leveled hundreds of square miles of Siberian forest, leaving trees flattened to the ground. New evidence, based on strange, glowing clouds in the upper atmosphere, proves that Tunguska wasn't caused by aliens after all. More »