We came here for their Free day and it was a madhouse! We were sure glad we got here early though because when we left they weren't allowing anymore people in until the same number of people left. The exhibits were good but to be honest we didn't get to see everything due to the sheer number of people in attendance and the fact that it was extremely hot. We do want to return however and next time we will pay the admission price to be able to really enjoy it.