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GOP presidential candidate Herman Cain gave a press conference to address allegations that he made unwanted sexual advances toward female employees and a woman seeking job advice in the 1990s. Cain emphasized that the accusations were false. NPR's Tamara Keith joins Robert Siegel to explain.

In sports, the SEC is very popular these days, especially in football. But, as Frank Deford points out, it's hard times for members of the Big East.

This week, a Continental flight from Houston to Chicago used a biofuel blend made in part from algae, and Alaska Airlines will fly passengers using a fuel made in part from cooking oil. The fledgling environmental effort has many hurdles, as biofuel costs nearly six times as much as regular jet fuel.

Revenge attacks are alarming those hoping for a swift transition to peace in Libya. Some villages where loyalists to overthrown dictator Moammar Gadhafi used to live are now abandoned, and locals hope they stay away. As well, militias still have their weapons, and regional rivalries are at play.

A study by the Pew Research Center's Internet and American Life Project reveals what teens think about the online experience. While bullying on social media sites like Facebook gets a lot of news coverage, most teens think social networks are a friendly place for them.

The Penn State Board of Trustees says it will appoint a special committee to investigate a child sex abuse scandal. This is the case that engulfed the university, its football program and coach Joe Paterno. Former assistant football coach Jerry Sandusky is accused of repeatedly sexually abusing young boys over a 15-year period, sometimes in the Penn State locker room.

New slow-motion photography shows the tiny birds shed water much like dogs do: by whipping their heads back and forth. But hummingbirds do it mid-flight and really fast — reaching a G-Force of 34. That's five times faster than a Formula 1 racing car.

The school's trustees are also launching their own investigation into the allegations that a former assistant football coach sexually abused young boys — and that some school officials had been told but didn't alert police.

Karen Kraushaar hoped details of her harassment claim would stay secret. She didn't want controversy. Meanwhile, the AP has details of a complaint she filed against another employer. And a Cain aide falsely claimed Kraushaar's son works for Politico.

Also: IMF chief warns of a "lost decade;" Greece's prime minister is expected to resign today; and Wal-Mart plans an ambitious expansion into medical care.