Britain's Conservative Party politician Enoch Powell, right, listens to two demonstrators in Canada in April 1968, reading a petition that describes him as a "racist." AP hide caption

In the control room of PJM Interconnection, employees monitor a power grid that stretches across the Midwest and Mid-Atlantic. PJM Interconnection hide caption

In the fall of 2017, left, Stream Tracker volunteer John Hammond found this creek near Fort Collins, Colo., to be dry. A year later, it was flowing again. Kira Puntenney-Desmond/Colorado State University hide caption

Monroe isn't shy about her accomplishments on Sparrow; the singer admits to blasting the album in her car. Hannah Burton/Courtesy of the artist hide caption

West Delta 105 E is an oil-producing platform located a dozen miles off the Louisiana coast in the Gulf of Mexico. A 2014 explosion on the lower deck killed Jerrel "Bubba" Hancock. Bureau of Safety and Environmental Enforcement hide caption

Ralph Gagliardo was incarcerated for much of his daughter Abby's childhood. At StoryCorps, they talk about their relationship while he was in prison and after he returned home. Daniel Sitts/StoryCorps hide caption