Sharks have been cast as the ultimate villain ever since the movie “Jaws” was released 50 years ago this summer. The film tells the story of a great white shark terrorizing beachgoers, but in reality, humans pose the greater threat to sharks. Endurance swimmer Lewis Pugh is swimming around Martha’s Vineyard, where “Jaws” was filmed, to get that message out. PBS News’ Ali Rogin spoke with Pugh for more. | PBS NewsHour