Today on CNN 10 we break down the Iowa caucuses track record of predicting presidential elections, congratulate CNN Hero of the Year Dr. Kwane Stewart, and meet an astronaut at the center of a mystery in space.Today on CNN 10 we break down the Iowa caucuses track record of predicting presidential elections, congratulate CNN Hero of the Year Dr. Kwane Stewart, and meet an astronaut at the center of a mystery in space.
