This was a weekend of visiting. We hosted a dinner for visiting family from California, then attended a dinner at which a visiting Mama from Germany was the guest of honor. The weekend was mellow and the weather was lovely, and the the entire thing passed far too quickly, as they tend to do. One conversation with a friend revolved around why we do what we do, and what seems to be our tipping point from contemplating a change to actually acting on it. (This woman is remarkable, and has ascended in corporate ranks within the health care community with astonishing speed and great success, and she is familiar with striving well beyond expected levels to pursue goals.) She looked pointedly at me when this came up, and she said, 'Well, what did it for you? What process did you undergo that catalyzed a life changing series of decisions about going to grad school and reinventing yourself midlife?' I thought about it for a moment, before I responded. 'My decision to study med...