MIT’s Edgerton Center holds free Science on Saturday programs five times a year for elementary, middle, and high school students — as well as their parents and teachers.  On December 5, the program will be focused on Nuclear Science and Engineering.  Kids under 12 must be accompanied by an adult.  The program includes a one-hour presentation at 10AM followed by hands-on activities at 11AM.  No pre-registration is necessary but seating is limited and first-come, first-seated.  It’s held in MIT’s Kresge Auditorium, 48 Massachusetts Ave. in Cambridge.