Main Internet Servers Come Under Attack

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Military Shows Off Experimental Heat Ray

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NRC Declines Security Boost for Nuclear Plants

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Playing Nice Isn't Always a Natural Instinct

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Chinese Missile Destroys Satellite in 500-Mile Orbit

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U.S. Faces a Drop in Ability to Monitor Climate

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Mars Surveyor May Have Fallen to Software Issue

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Scientists Compete to Design New Nukes

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Solving an Old Math Problem Nets Award, Trouble

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The White House's Cold-War Cleanup Plan

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U.S. Nuclear Weapons More Stable than Expected

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Intricacies of Ancient Lunar-Cycle Machine Revealed

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