What Los Angeles museum is this?

I went to a field trip when I was in the first or second grade. I am now 20. The reason for this question is because I have younger brothers and I want them to experience this awesome place. I remember there was a dark room in which a light would flash and your shadow would be imprinted on the walls, and there was also a bike that generated electricity or something, as well as one of those electric static that connects the electricity to wherever your finger touches it. Thanks so much.