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Donald Sundman, president of the Mystic Stamp Company, has traded a rare and valuable stamp -- an obscure "Z-grill" -- for a block of airmail error stamps from 1918 worth nearly $3 million. The stamp's new owner, private collector Bill Gross, now has a complete collection of 19th-century U.S. stamps.

Teddy Roosevelt's greatest adventure came in 1914 when the former president visited South America. He barely escaped after agreeing to survey an uncharted river in the heart of the Amazon jungle.

Linda Wertheimer speaks with Robert Wittman, senior investigator of the FBI's new Art Crimes Unit, about searching for -- and recovering -- stolen art and artifacts around the globe.

The current issue of Popular Science magazine lists the 10 worst jobs in science. Among them: orangutan-pee collector, manure inspector and human lab rat.

New reports from the Pew Hispanic Center conclude that low-income Latino students are the most segregated, ill-served group in the country's public high schools. The reports detail high school conditions for Hispanic students in the United States.

I. Lewis Libby, Vice President Dick Cheney's former top aide, pleads not guilty to charges against him in a case probing who revealed the identity of a covert CIA agent. He was arraigned in federal court in Washington, D.C., on charges of obstructing justice, perjury and making false statements.

New Orleans' low-lying Ninth Ward suffered back-to-back floods as hurricanes Katrina and Rita rolled through the Gulf region. The historic Holy Cross neighborhood escaped much of the destruction, but residents are concerned about the future.

Customers and scientists are raising questions about the accuracy of the widely publicized genetic test Baby Gender Mentor. Customers have complained to the Federal Trade Commission. And at least one law enforcement agency is investigating a company that sells the test.

Folk-music legend Odetta was a force in the 1960s push for social justice. Her passion inspired fellow musicians and activists such as Joan Baez, Bob Dylan and Harry Belafonte. Odetta died Dec. 2, 2008, at the age of 77. Hear a 2005 interview.

A little less gangsta, a little more J. Crew. The National Basketball Association imposes a dress code. But some players see the new rules as racist, denegrating fashions popular with young black men.