http://adf.ly/1SZdI2, http://adf.ly/1XIsTW, http://www.ctvviet.com, http://www.nhac24.com <br />What does history tell us about debates and presidential polls? That answer is featured on today's show, as well as the next installment in our series on potential international challenges for the next U.S. president. Also covered: a new report on global air pollution, a medical controversy over flu shot timing, and a Character Study of a charitable dentist.
