We spent about 2-3 hours here and my kids had a blast. There's a cool dinosaur exhibit, a space mission exhibit, as well as exhibits with hands on activities for kids. One of the hands-on activities involved building paper rockets, putting them on air tubes, and launching them!
In addition, there's an IMAX theater if you're into that kind of thing. We skipped the IMAX and chose to stick with the exhibits.
The next time you're driving through Iowa, remember there's a cool Science Center your kids will love. It's not just corn fields and hogs in Iowa. There's science too!!!