We visited the center on a Sunday and it was not crowded at all. We had fun for hours. We made sand patterns, sparks and rainbows. We drew perspective drawings on glass, spoke through a giant balloon, learned how airport security works, saw a Marx steam engine demo, played spies, and shone light through a water lens. My husband and I took a little break at a cute faux French café – there was no food, but it was pleasant under the striped awning of Chez James. Only later did we realize that the table where we took a break was bugged – it was part of the spy exhibit – and someone could have been listening to every word we said! We never did see a man with his arm on fire, but both kids definitely thought it was very much worth the trip.