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The cooling towers of Three Mile Island's Unit 1 plant pour steam into the sky in Middletown, Pa. In 1979, Three Mile Island's Unit 2 nuclear power plant was the scene of the nation's worst commercial nuclear accident. Carolyn Kaster/AP hide caption

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A soldier from the Libyan military's elite Khamis Brigade, led by Moammar Gadhafi's son, takes a position in Harshan, Libya, on Feb. 28. The Khamis Brigade is one of the elite units Gadhafi has bolstered while keeping the regular army weak, analysts say. Ben Curtis/AP hide caption

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Tuesday

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Scientists use a mesh material as a scaffold to seed bladder cells as they grow. After three to six weeks, the cells are transplanted inside the child's urethra, where they eventually replace the damaged tissue. Wake Forest Institute for Regenerative Medicine hide caption

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President Ronald Reagan gestures during a news conference at the White House in January 1986, when he said there was "irrefutable evidence" that Libyan leader Moammar Gadhafi was involved in airport attacks in Rome and Vienna in December 1985. Scott Stewart/AP hide caption

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