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Engineers testify before the Senate that downtown New Orleans should not have flooded during Hurricane Katrina. The flooding occurred because walls along canals had faulty foundations and collapsed. The investigators said it's unclear whether the walls were poorly designed or shoddily constructed.

The U.N. Security Council unanimously approves a resolution demanding Syrian cooperation in the ongoing probe into the assassination of former Lebanese Prime Minister Rafik Hariri. The United Nations is investigating Syria's alleged role in the killing.

Mark Twain once said, "I never let school interfere with my education." That's just one example of an aphorism from a new collection of the handy sayings gathered and annotated by author James Geary in The World in a Phrase.

Last March, Indonesia saw its first polio case in 10 years. Now, 300 children have been crippled and 60,000 infected. Before health officials can stamp polio out, they'll have to win over parents distrustful of the vaccine.

In Pakistan, there's a race with winter to provide shelter for millions left homeless by last month's earthquake. The United Nations recently increased the projected monetary need to $500 million.

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.

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.

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.

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.

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.