I went on a field trip with Sean to the Detroit Science Center, and I have to tell you it is a very cool place! Almost everything is hands on. They also had some presentations that were both educational and entertaining (especially when adults were the victims). The center has a planetarium and I have to say that was my favorite! I've always loved them. They also have an IMAX theater, unfortunately we didn't get to see that show.
Impression 5 in Lansing is still better for very young children, but I would highly recommend this for older kids, especially if they have a keen interest in science.
These pictures are of a robotic arm playing chess... way cool!