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An elephant at the National Zoo has a particular fondness for playing the harmonica. But that raises some questions: From an evolutionary perspective, what is music and why do we have it?

As the Democratic National Convention kicks off in Charlotte, N.C., the economy is expected to be a central theme. The event is bookended by Monday's Labor Day celebrations and Friday's release of the latest monthly numbers on jobs.

Having given the order to kill Osama bin Laden, President Obama has silenced decades of Republican carping that Democrats are weak on defense. That still might not win the president many votes, however.

As Syrians flee war in their homeland, many come to Lebanon, which has not built tent cities as other countries in the region have. Some Syrians are taking up residence in Palestinian refugee camps that have existed for more than six decades.

With 24 hours of nothing happening at the GOP convention in Tampa because of Tropical Storm Isaac, Ron Paul supporters for the second time in as many days made themselves the center of attention at Mitt Romney's nomination party. Tuesday, they may be at the center of a real floor fight over rules.

President Obama's slate of nominees will have to be confirmed by the Senate, but those nominations could be held up by a filibuster threat. Democrats are trying to crack down on what they see as misuse of the filibuster, and it looks like Republicans may be willing to come to a deal.

Vice President Joe Biden says his task force on reducing gun violence is facing an unexpected obstacle: slim or outdated research on weapons. Public health research dried up more than a decade ago after Congress restricted the use of some federal money to pay for those studies.

Figuring out when an athlete with damaged knee ligaments can get back in action is an inexact art at best. Doctors have various ways to mend a busted knee, but the results, like car mileage, can vary.

While underground dinners may seem like old hat to some, a handful of startups are betting the concept is just beginning to take off. But many supper clubs are still more expensive than the average restaurant meal, which may limit the market.

There were more than 500 homicides in the city last year. Officials and residents are counting on President Obama's gun control package to bring that number down. "We didn't want other parents to be like us," says one Chicago mom, whose son was shot to death on a city bus.