This year marks the 50th anniversary of the founding of the Exploratorium, the self-described "museum of science, art and human perception," in San Francisco, California and the 10th anniversary of the launching of the National Research Council/National Academy of Sciences, Engineering and Medicine report Learning Science in Informal Environments: People, Places and Pursuits. The moment offered me an opportunity to reflect on my own professional journey, which began at the Exploratorium, coincided with a growth spurt of field knowledge-building and has included experiences that inform how I