Broadcasting from the Sundance Film Festival, we are joined by three guests who personally battled with DuPont and are featured in the new documentary called "The Devil We Know," that looks at how former DuPont employees, residents and lawyers took on the chemical giant to expose the danger of the chemical C8, found in Teflon and countless household products—from stain- and water-resistant apparel to microwave popcorn bags to dental floss. The chemical has now been linked to six diseases, including testicular and kidney cancers.