No matter how much we love our jobs, we're probably not expecting to be at them forever. Gone are the days when you started working down in the mines at 11 years old and spent the rest of your days until retirement there—or until the black lung took you. No, despite the children's yearning, they're no longer sent into the mines, and we're not expecting to work at the same place forever, either. Fortunately, many of us have the privilege of being able to seek greener pastures, probably only to f…