Montana Senator Jon Tester answers three questions about toilet testing.
Grand Pursuit: The Story of Economic Genius
Author Sylvia Nasar explains why legendary economists like Marx, Keynes and Friedman have played vital roles in world history. Nasar wrote about the three and many others in her most recent book "Grand Pursuit: The Story of Economic Genius."
Nasar is best known for her award-winning best seller "A Beautiful Mind."