Went back after not having been here for several y...

Went back after not having been here for several years. We have kids 2, 5, and 7 and thought it would be a nice spring break activity. After 45 minutes and not being able to use any of the exhibits due to the overwhelming crowds, we asked for (and received) a full refund. I asked if there is a cap for number of people in the building, as one of my first thoughts when we were in the middle of the massive crowds was that if there were a fire or other emergency we would all be doomed. Lack of adequate staff also added to the chaos as there were people misusing the exhibits and being unruly and rude. Has potential if you were able to use the space.