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Nearly 200 mayors from across the country have been in Orlando this week for the 80th annual meeting of the U.S. Conference of Mayors. Many mayors are particularly focused on reducing violent crime, especially gang violence. Host Scott Simon talks with Philadelphia Mayor Michael Nutter and New Orleans Mayor Mitch Landrieu about their efforts.

Researchers have retracted a study that found that hormone boosted production of insulin-producing cells in mice. They say they erred in counting the cells involved.

In a new book, The Anatomy of Violence, Adrian Raine argues that violent behavior has a biological basis just like depression or schizophrenia. This raises questions about treatment, accountability and punishment, including the death penalty.

Envelopes sent to a senator and President Obama contained a substance that initially tested positive for ricin.

The field of GOP challengers narrowed a day after the caucuses as Minnesota Rep. Michele Bachmann said she is ending her 2012 presidential bid. Meanwhile, Texas Gov. Rick Perry went home to regroup after his poor showing in the Hawkeye State.

Last semester, Stanford University professors tried something radically new: They opened their classes to the world for free. Within hours, thousands had signed up to participate. The classes' success could transform the way we look at higher education.

Athenaeums are social libraries, cornerstones of a community where you don't just borrow books — you can visit cherished antiquities, hold talks, attend parties and even bring your dog. In Providence, R.I., the "Ath" is a 19th-century library with the soul of a 21st-century rave party.

In 2004, Jin Auyeung seemed glory-bound — the first Asian-American rapper with a shot at cracking the mainstream. When his career in the U.S. stalled, he found an audience waiting for him on the other side of the world.

Is he a "wimp" who blinked during fiscal cliff wrangling, failing to pursue a grand bargain and weakening his future hand? Or a pragmatist who negotiated a "big win" in securing congressional approval for the first tax increase on the wealthy in more than two decades?

It looks like Virginians will be choosing between polarizing figures for governor this year: right-wing state Attorney General Ken Cuccinelli, and former Democratic National Committee Chairman Terry McAuliffe. Polls show voters don't much like one, and don't really know the other.