More than 150 interactive exhibits lets museum goers play with science, whether it’s testing out a prototype or virtually skiing the Alps. Great area for children under Grade 2, at KidSpace. A 3-D theater screens educational films. Admission: $14-17. Free, 30-minute guided tours, daily 11 am and 2 pm. September-June, open Tu-Su 10 am-5 pm. July-August, open daily 10 am-5 pm.