For the first time in history two black candidates, President Barack Obama and Herman Cain, may run against each other for the presidency. As it did three years ago, discussions of race and racism continue to play out around both campaigns.
A hundred years ago, two teams were racing to the South Pole. The Norwegian team led by Roald Amundsen made it first, beating British explorer Robert Scott. But only Scott did pioneering science--and photography--along the way. Ira Flatow and guests discuss the achievements of the first Antarctic expeditions.