Hong Kong pro-democracy protesters paralyzed parts of the city for a fourth successive day Thursday, forcing schools to close and blocking highways. China has positioned up to 12,000 troops in Hong Kong who have kept to barracks, but officials have vowed to stop any attempts at independence. We learn more from Hong Kong official Ronny Tong. Also, what is the history of American efforts to counter corruption around the world and why that work has been so important for US foreign policy. Plus, the latest in Australia as the wildfires there continue to rage.