Strange Internet Virus Partially Explained

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Earlier this summer, an Internet worm called "Stuxnet" made its way through computers across the world, and it seemed to have a fondness for wrecking Iranian nuclear centrifuges. Who did it? The Times: "The paternity of the worm is still in dispute, but in recent weeks officials from Israel have broken into wide smiles when asked whether Israel was behind the attack, or knew who was." [NYT]