THE DISCOVERY MUSEUMS

117 Main St., Acton, (978) 264-4200. Open Tues. and Fri from 1 to 4:30 p.m., on Wed. from 9 a.m. to 6 p.m., and on Thurs., Sat., and Sun. from 9 a.m. to 4:30 p.m.

¥ Children's Museum: hands-on exhibits and daily activities for children of all ages. April 27: Calling All Birds! at 1:30 p.m.--¥ Science Museum: learn how and why things work through exhibits, including "Percussion Alfresco," and "Sea of Clouds: New Experiments in Art and Technology, "daily experiments, and fun lectures.