Aside from work topics: philosophy, particularly neoplatonic philosophy and theurgy, as well as the descendant branches of thought such as alchemy and the hermetic arts; playing upright bass in a variety of styles; yoga; amateur-level physics (don't have the math background for in-depth stuff); herbalism; travel; alternative healing arts; psychology (again, lay-person understanding); occasional art-making (bookbinding, small woodworking, jewelry fabrication).