Sousa’s 100-year-old compositions include patriotic military marches that will also no doubt crop up in the long grind to the 2016 presidential election. And while they aren’t remembered by name, one man seeks to preserve the American composer’s legacy —…

Greatly reduced since its Cold War heyday, some say the U.S. nuclear arsenal is overdue for an overhaul. The PBS Newshour got exclusive and unprecedented access to labs and facilities across the country to observe how the B-61 nuclear bomb…