As China continues its massive economic growth, especially in cities, the government continues to severely limit people's rights. Is that system sustainable? Johannes Eisele/AFP/Getty Images hide caption

itoggle caption Johannes Eisele/AFP/Getty Images

According to Roberts, Mary Todd Lincoln could have "tremendous flare-ups of temper," but she was also smart and politically savvy. Library of Congress/AP hide caption

itoggle caption Library of Congress/AP