There have been several promising developments lately in cancer research and treatment, including a new drug approved by the FDA this week for advanced pancreatic cancer. William Brangham reports.

Canada imposed retaliatory tariffs against the United States as the two neighbors slide toward an all-out trade war. The tariffs will hit a range of U.S. products, from industrial goods to everyday items. At the same time, President Trump is threatening Canada with even steeper tariffs. William Brangham reports.