Is 2011 the worst tornado season ever? Historical tornado statistics suggest near record spike in a declining trend (KML, map, pictures)

The devastating series of tornadoes, of which the F-5 (maximum intensity) event that hit Joplin, Missouri left in its wake

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Walter Alvarez: Discoverer of astreroid that killed the dinosaurs at Microsoft Faculty Summit

Walter Alvarez teaches geology at Berkley and his main contribution to the history of science is the theory that the

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