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Researchers are suggesting that flawed construction -- not storm surges -- likely caused key floodwalls around New Orleans to fail. They say the waters of Lake Pontchartrain never got high enough to rise above the walls and erode their foundations, the early explanation for the levee collapses.

The top four teams in the NCAA men's basketball tournament all made it to this weekend's round of 16. But for some, No. 1 seed Ohio State's advance is marred by a call that officials declined to make.

Puerto Rico's governor is resisting calls to resign despite growing protests against his government. The demands follow the release of private text messages between him and top advisers.

Some 15 million people are expected to attend the Olympic games in Paris, which are now in their second week. Keeping them safe is a top priority, so the French government has brought in soldiers.

The top tourist destination in Peru is the Incan citadel of Machu Picchu. Not so well known is that the capital Lima also holds many ancient ruins — so many that that they can't all be taken care of.

Gen. Stanley McChrystal, the top U.S. commander in Afghanistan, spent Wednesday pitching President Obama's revised Afghan strategy to his troops and Afghan officials. McChrystal acknowledged it's going to take more than words to persuade Afghans that Obama's new strategy can bring peace.

The battle lines have been drawn over Scotland. Nationalists want to push forward with a referendum on independence from Britain. British Prime Minister David Cameron is maneuvering to make sure Scots vote "no" on independence.

Top executives of Wells Fargo and Equifax faced lawmakers on Capitol Hill to answer questions about ongoing scandals at both companies.

A top military general in Bolivia on Wednesday attempted to overthrow the government. The failed coup was put down quickly and the general was arrested.

A second woman has come forward with accusations of sexual assault against Virginia Lt. Gov. Justin Fairfax. This follows days of turmoil for the state's top officials.