I've got a lot of big writing projects going on right now, and that is sapping my desire to post here.
But I did want to share one interesting link I found while working on one of them: Reflections on Relativity. It is a free, online book covering relativity (not just Einsteinian but also pre-Einstein conceptions), in a highly mathematical fashion that manages not to be so drenched in equations as to be incomprehensible without serious study, an extremely delicate balance.
