Framingham State University’s Christa McAuliffe Center will hold its third annual Science on State Street festival on April 21, 2:30-6PM, in the parking lot of FSU’s O’Connor Hall (map).  It’s free and open to all ages, with hands-on activities (in biology, chemistry, physics, food science, robotics and engineering), presentations by FSU faculty and invited scientists, conversations and performances that explore the interaction between science and the arts, and planetarium programs.