Wow, what a cool web forum! Here's a question I've been wondering since I read about gravitomagnetism on Wikipedia. I'm very familiar with Maxwell's equations (having majored in electrical engineering), and I know that self-inductance resists any attempt to accelerate a charge, and that the energy exerted in doing so is radiated as an EM wave. When I flip the signs everywhere that "charge density" appears (as I am told we have to do in gravitomagnetism, for fairly clear reasons), and try to re-derive self-inductance, I end up with negative self-inductance. So general relativity actually... helps us accelerate our masses? Huh? Where does the extra energy come from? Thanks. This has been driving me crazy.