Take a class, learn something new.
Pack your lunch and listen as local scholars discuss the history of science or other related subjects like the regimentation of chemical education in Nazi German and how the mid-19th-century concern with stench led to the crusade against smoke in the Progressive Era. Tuesdays, noon. Free. Chemical Heritage Foundation, 315 Chestnut St. chemheritage.org
Calendar: Feb. 25-March 4
Calendar: February 18-25