In one study, old people assigned to a geriatrics team stayed independent for far longer, and were admitted to the hospital less.

In many ways, the effort to study philosophy was my rebellion away from medicine. I'm the son of two Indian immigrant physicians, so the natural path for me would have been to become a doctor. I ended up doing the master's degree at Oxford in politics, philosophy, and economics while already having a seat in medical school. I was keeping that as my escape hatch. But my hope was that I might become a philosopher or something else entirely.

The possibilities and probabilities are all we have to work with in medicine, though. What we are drawn to in this imperfect science, what we in fact covet in our way, is the alterable moment-the fragile but crystalline opportunity for one's know-how, ability, or just gut instinct to change the course of another's life for the better.

We look for medicine to be an orderly field of knowledge and procedure. But it is not. It is an imperfect science, an enterprise of constantly changing knowledge, uncertain information, fallible individuals, and at the same time lives on the line. There is science in what we do, yes, but also habit, intuition, and sometimes plain old guessing. The gap between what we know and what we aim for persists. And this gap complicates everything we do.

Just using a checklist requires [doctors] to embrace different values from ones we've had, like humility, discipline, teamwork.

In the end, people don't view their life as merely the average of all its moments-which, after all, is mostly nothing much plus some sleep. For human beings, life is meaningful because it is a story. A story has a sense of a whole, and its arc is determined by the significant moments, the ones where something happens. Measurements of people's minute-by-minute levels of pleasure and pain miss this fundamental aspect of human existence. A seemingly happy life maybe empty. A seemingly difficult life may be devoted to a great cause. We have purposes larger than ourselves.

One of the reasons people might be fallible, why we might fail to do what we try to do isignorance, that we have a limited understanding of the laws of the world - the physical laws that govern the world and of all the particulars of the world upon which those laws work. And then there's ineptitude, meaning that the knowledge is available, but individuals fail to apply it correctly. The third source is "necessary fallibility." That is, we're never going to be omniscient, there is some knowledge that we will simply never achieve, and there are limits to what we will be able to do.