10375 Little Patuxent Parkway, Columbia. 410-313-7800.
•All Together Now. Saturdays, 10:15 and 11:30 a.m. All ages; 30 minutes.
•Chemistry in the Library: Chemists Celebrate Earth Day. Sat., April 26, 2 p.m. Join a chemist from the Army Research Laboratory and the American Chemical Society for hands-on experiments. Ages 7 and older. Registration required.
•Eclectic Evenings. Second Tuesdays, 7 p.m.
•English Conversation Club. Mondays, 10 a.m. and Thursdays, 7:30 p.m. Practice speaking and understanding English in a group setting....