The Medford Public Library’s summer Friday movie series presents a screening of  Steven Spielberg’s 1975 blockbuster “Jaws”  in Bonsignore Hall.  The film stars Roy Scheider as police chief Martin Brody, who, with the help of a marine biologist (Richard Dreyfuss) and a professional shark hunter (Robert Shaw), hunts a man-eating great white shark that attacks beachgoers at a summer resort town. No registration is required. The film series will conclude on August 11 with “Back to the Future.”