How infighting almost silenced Dr. King's momentous "I Have a Dream" speech.
Claire McCaskill, a senator from Missouri, believes that between 4,900 and 6,600 graves may be unmarked or mislabeled on cemetery maps. Claire McCaskill is chairwoman of an oversight panel on the Senate Homeland Security and Government Reform Committee.
President Barack Obama and Michelle Obama are seen here on their wedding day, Oct. 18, 1992, in Chicago, Ill.
The European Space Agency's unmanned Rosetta spacecraft will perform a flyby of asteroid Lutetia on July 10.
Possibly the Youngest Galaxy Ever Seen, an irregular dwarf galaxy about 45 million light-years away is seen in this image from NASA.
How hubris – in various shapes and forms – played a role in America’s decision to go to war in Iraq.
FBI files on Sen. Ted Kennedy kept between 1961 and 1985 are full of death threats and clues to the senator's relationship with the FBI Director J. Edgar Hoover.
Ted Kennedy received death threats even five years after his 1980 presidential run.
With just two planned space shuttle missions remaining, NASA has launched the Face in Space project. Send NASA a photo of yourself, and it will fly aboard one of the final shuttle missions.