The exhibits are mostly nice and the staff was hel...

The exhibits are mostly nice and the staff was helpful and friendly. Some things, like the butterfly exhibit, could have been a little cleaner or better managed. Dead butterflies/moths scattered around the place took away from the experience. The best part was that we got in for free because they had a "neighborhood days" event going on. If you live in any of the Philly neighborhoods, you could get up to 4 tickets for free. Unsure how often they do this so look out for it if you live in the city or know someone who does. I think it's $29 a person otherwise, including access to the special exhibits which cost extra (e.g. butterflies.) $29 is definitely a lot, the experience is worth about half that in my opinion. Spent about 1.5 - 2 hrs here and felt like that was enough to enjoy everything thoroughly.