I can help with physics and math at most levels I would anticipate the users to be at.
This includes all undergraduate physics, string theory, special and general relativity, cosmology, graduate quantum mechanics, graduate classical mechanics, introductory quantum field theory, complex variables, differential equations, PDEs, calculus (of any kind), differential geometry, probability, linear algebra (including tensor analysis), abstract algebra, basic topology, and maybe a couple of things.
(Just trying to give a list of what I can answer questions about...much beyond that and I'm afraid I wouldn't be much help...real analysis is right out as I never cared for the stuff and haven't taken the courses.)
