Harvard’s School of Engineering and Applied Sciences hosts an annual Holiday Lecture for families, free and open to the public (recommended for ages 7+).  This year’s lecture, on Sunday, December 18, will be an interactive presentation, The Science in a Bubble:  Illuminating Interfaces, in Science Center Lecture Hall B, 1 Oxford Street, Cambridge (flyer).  Register for either the 11AM or 2PM show to guarantee seating.