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. Ali Rogin speaks with endurance swimmer Lewis Pugh, who wants to get that message out by swimming around Martha’s Vineyard, where “Jaws” was filmed. PBS News is supported by - https://www.pbs.org/newshour/about/funders