Interactive exhibits present the wonders of science in an entertaining way. Shows at the multimedia Discovery Dome, Alberta's largest indoor theatre, combine computer graphics, motion-picture images, slides, and a superb sound system. The Children's Discovery Centre is designed for kids three to seven years old. www.calgaryscience.ca. C$12. Mon.--Thurs. 9:45--4, Fri. 9:45--5, weekends 10--5.