Chicago's Museum of Science and Industry was a bit of a disappointment for us. I hadn't been back since a youth group trip in high school, and I don't think a single thing has been changed or updated in the 12 years that I've been away. Compared to the other museums that Chicago has to offer, this Museum only gets 2 stars.
The only redeeming quality was the U-505 Submarine exhibit that we paid $5 extra to visit. It was pretty interesting and our tourguide, Sean was very knowledgable on his subject. (A little too passionate about his subject, perhaps, but still knowledgable.)