A massive recovery effort is under way to recover debris from the space shuttle Columbia scattered across eastern Texas and western Louisiana, where the orbiter fell on Saturday. NASA is vowing to discover what caused the shuttle to break apart nearly 40 miles above the Earth.

More than a decade after the Persian Gulf War, the United States and its allies are locked in another showdown with Iraqi President Saddam Hussein.

CNN.com examines how the contributions of African Americans in areas like literature, music and the sciences have helped shape U.S. culture.