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Two months after al Qaeda terrorists flew airplanes into the World Trade Center towers in Manhattan on September 11, 2001, analytical chemist John Butler found himself working late nights in his lab, developing DNA assays to identify 911 victims from the tens of thousands of charred human remains recovered at Ground Zero. Thinking back, he still clearly remembers the sense of rising to a national need that was shared by dozens of researchers recruited to the same difficult problem.

The President works on his Libya speech with National Security Advisor Tom Donilon during a conference call on Air Force One, via The White House on Flickr The President's speech last night was primarily billed as his chance to plead his case to the nation for the ongoing military intervention in Libya. But slipped into his remarks was a primer on 21st century leadership in a time of change, a topic Life in Beta is particularly interested in. Here were Mr