The Museum of Science and Industry makes science fun with interactive, educational exhibits that stretch the imagination. Spend time in a 16-foot (4.8-meter) heart as you learn about how yours works. Find out how technology has influenced history by stepping back in time on "Yesterday's Main Street." Marvel at the life-size replica of German submarine U-505 and also the command module of Apollo 8. Watch action-packed films in the museum's giant-screen Omnimax Theatre or take a ride down a coal mine. And don't leave without picking up some great souvenirs at The Big Idea museum shop.