Carnegie Science center is definitely one of the better science centers I've been to. I stopped in with a colleague because we needed to kill some time before our next meeting. I was reluctant to go in because I thought everything would be really kiddy. To my surprise it wasn't entirely kiddy at all and at the same time I found myself feeling like a kid again.
I really enjoyed the earthquake machine in the sci quest exhibit on the first floor. It essentially recreates earthquakes that have occured in a diner setting. This thing really shakes it was awesome. Fortunately I've never experienced one and it gave me a good idea of what it's like.
We mainly went to see R2D2 and C3PO at their roboworld exhibit on the second floor. It was presumptuous of me to think they were the actual ones used in the movies but to my disappointment they were replicas. I should have known the actual robots wouldn't be here, but oh well it was still cool to see the life sized replicas. The miniature railroad and village was closed because it was undergoing some changes but I was still able to see some of it from afar and it was so detailed it's overwhelming. I would imagine it's a sight to see when it's fully operational.
The seascape exhibit on the 3rd floor is really cool. Your able to see all types of fish in their natural coral environment. One aquarium actually has the three stages of coral reef: fringing, barrier, and atoll (see...I learned something).
The 4th floor got a little kiddy for me but I still enjoyed the little stations like building a circuit, building a dam etc..
My favorite part of Carnegie science center was the USS Requin submarine. I've never been inside a submarine before and it just blew me away. I didn't think they would allow you to roam the entire submarine but they do. Being in the submarine really gave you a sense of what it was like to be part of the crew when it was in use. It was amazing to see how the crew lived inside one of these things. It's REALLY tight living quarters and to think they spend months at a time in this thing is crazy. Every nook and cranny was used.
I didn't have the time to check out the science stage, digital dome, the kitchen or works theaters, and IMAX theater but will definitely check it out the next time I go.
All in all it was a fun experience and I recommend going even if you don't have little kids, just go and be a kid again.