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Along the coast of Peru, a mysterious civilization sprang up about 5,000 years ago. A team of archaeologists believe a climate change led to the rise of this civilization of mound builders, which eventually spread across South America.

The San Diego Opera opens their 2010 season with Giacomo Puccini's classic La Bohème. We'll talk with members of the cast, including San Diego-based soprano Priti Gandhi, who performs the role of the irrepressible flirt Musetta in La Bohème. We'll also talk with San Diego Opera's Dr. Nic Reveles about why La Bohème is such an enduring story.

Religion professor Richard Hughes critiques the powerful and potentially dangerous myth of America as a Christian nation.

College football's national championship will be decided Wednesday when Texas faces defending champion Southern California in the Rose Bowl. Six games on Monday offered a wild series of warmups, while in a final preliminary on Tuesday night, Penn State and Florida State meet in the Orange Bowl.

What are the effects of technology such as Facebook, Twitter, texting and email on social interaction and etiquette? We speak with technology etiquette expert, Elaine Swann and experts on social networks, James Fowler and Noah Arceneaux about the relationship between new technology and social behavior.

Since antiquity, scientists have studied lunar eclipses to learn about the shape and location of the sun, the moon and Earth. But if astronomers have been watching lunar eclipses for thousands of years, is there anything left to learn?

Inglorious Basterds and Nine Lead with 10 Nominations Each

In archaeological sites throughout the world, antiquities are plundered for sale. U.S. agents says the looting is epidemic. One archaeologist working in Guatemala has launched a battle to save an ancient city from looters.

Republicans are suggesting that the new guidelines for breast cancer screening reinforce their nightmare scenario about health care rationing under President Obama's proposed overhaul. The political brouhaha comes as the Senate is about to take up its health care overhaul bill.

The court left in place Monday a lower court ruling that made it possible for federal prosecutors to charge a former member of the Ku Klux Klan with a 40-year-old kidnapping.