Clinical ethics is a relatively new discipline within medicine, generated not so much by the "Can we . . . ?" questions of fact and prognosis that physicians usually address, but primarily by the more uncomfortable gray areas having to do with "Should we . . . ?" questions:Should we use a feeding tube for Mom?How should we deal with our baby about to be born with life-threatening anomalies?Should our son be taken off dialysis, even though he'll die without it?Wh...