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 Saturday, December 7, will be an interactive presentation, The Science of Ice Cream: It’s Legen-Dairy, in Science Center Lecture Hall B, 1 Oxford Street, Cambridge. Learn about the physics, chemistry, and biology of how ice cream is made. Register for either the 10AM or 1PM show to guarantee seating.