Former presidential candidates Mitt Romney, Michael Dukakis, John McCain, Walter Mondale and Bob Dole share their experiences of losing the presidential race.

Exploring the possibility of the world being on the verge of an arms race in outer space and the belief by some experts - military and civilian - of the inevitability of conflict in space.

Fareed Zakaria examines the successes and failures of Obama's eight-year presidency, looking at both his ambition and the way that led him to try to put new policies into place. Too often, Zakaria said in an interview, "We focus on the sensational and the daily scamper. What we are trying to do is ask what will this presidency look like when the history books are written?"