Interested in mathematics, theoretical physics, and cosmology, but purely as a hobbyist with an above-average knowledge of things. Did pretty well in school, but that was a long time ago, and "pretty well" is far, very far, in fact extremely remote from the level of expertise I encounter on this site.

One of my heroes is Richard Feynman for his ability to think out of the box (and on many occasions tearing down the box completely).