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Brian Todd reports on a Time magazine article that reveals new details about the March on Washington and Martin Luther King Jr.'s famous "I Have a Dream" speech.
CNN's Tom Foreman looks back at the history of North Korean threats and the resulting outcome of its brinkmanship.
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Researchers say President Barack Obama was a descendent of the first documented African slave in the U.S.
RELATED STORY: Obama's family tree connection to first African American slave