“Only one thing has to change for us to know happiness in our lives: where we focus our attention.” ~Greg Anderson No matter how beautiful the day is, and no matter how well most things are going in my life, sometimes I’ll ruminate on the awful “what ifs.” A recent example: During the past two weeks, I wasted too many precious hours worrying about the pending results of two follow-up medical tests — which ultimately turned out fine. The real key to happiness is linked to what we choose to dwell on. Most of us live charmed lives, after all, and most of our garden-variety stress is within our control.…