Framingham State University’s Christa McAuliffe Center seeks presenters and volunteers for the third annual Science on State Street festival (“Planet Earth Edition”) on April 18, 11AM-3PM, on its campus (directions).  It’s free and open to all ages, with hands-on activities (in biology, chemistry, physics, food science, robotics and engineering), featured presentations by FSU faculty and invited scientists, conversations and performances that explore the interaction between science and the arts, and planetarium programs.  To celebrate the 50th anniversary of Earth Day, this year’s festival will focus on planet Earth, environmental issues, and sustainability. Sign up now if you’d like to be an exhibitor.