The world is reacting to the passing of anti-apartheid leader Nelson Mandela. Tributes are taking shape in our nation's capital, where an official week of mourning has begun. Sally Kidd reports from Washington.
You got served, Conan O'Brien. The late-night talk show host discovered that diplomats have a way with words when he tweeted Thursday, "I picked out my Halloween costume. I'm going as 'Slutty Madeleine Albright.' "