Your growth depends on you
The Exploratorium encourages exactly what it implies: for you to explore the possibilities of the world around you and your personal capabilities. The philosophy of the museum is to learn, create, grow, and study the world around you so that you can better yourself and thus better the world around you. This means that the museum will give you plenty of options to grow and learn, but that means you need to take those opportunities. They will not just be handed to you.
As a Fieldtrip Explainer I had the chance to learn cool science phenomena, create activities, and help design exhibits. All of these things were available to all my coworkers, but I had to take advantage of them. It's really easy because you have so many opportunities to take them for granted and not take advantage of them.
I gained leadership skills, learned cool stuff about people and speakers, and even fought for the rights of my coworkers at the Exploratorium. On the same token, some of my coworkers came in and did the bare minimum to get by, never taking any opportunity to do more with their time there.
This is a non-profit so the pay is decent, but not anywhere near a place that is privately run/for-profit. As such, you need to understand that due to budget constraints you won't be getting paid as much as you would with your skillset in a for profit organization of similar stature. That being said, for a non-profit, it is one of the better paying non-profits I have worked at.
Opportunities to grow, amazing work culture, positive social impact
non-profit pay, need to take initiative to grow.