Rangos Omnimax Theater at the Carnegie Science Center, North Side, has brought back “The Polar Express” and “Rocky Mountain Express” for a limited time. Continuing as well are “ROBOTS,” “D-Day: Normandy 1944,” and “Mysteries of the Unseen World.” Tickets for most shows are $8.50 for adults and $6.50 for children ages 3 to 12. Call 412-237-3400 for show times. The center will be closed Sunday.