In this podcast I talk to Thomas Scott of the University of California, Davis, about dengue fever, a disease that's on the rise. Spread by mosquitoes, it can make you feel as if your bones are broken and leave you exhausted for months. In more serious cases, people suffer uncontrollable bleeding and sometimes die. Dengue is expanding its range, and is even making incursions into the United States. Scott and I talk about what scientists know and don't know yet about dengue, and what the best strategy will be to drive the virus down.