Answer: Living heart donors do occur but only rarely, perhaps a few per year at most, says University of Michigan, Ann Arbor, transplantation surgeon Dr. Jeffrey Punch. To understand it, take two patients: Joe has bad lungs but the surgeons would prefer to transplant him with a heart and lungs together. To do this, Joe's heart and lungs have to be removed, and they are replaced with the heart and lungs from a recently deceased donor.

Joe's lungs are, of course, no good to anyone — that's why he needed a transplant — so they are discarded. Joe's heart, however, is fine and can be given to someone with a bad heart. Bill has a bad heart and needs a heart transplant. When Joe's heart and lungs are removed, his heart can then be transplanted into Bill, whose own heart can then be removed and discarded.

Recap: That's two living patients, one deceased organ donor, and skillful surgeons versed in this medical legerdemain known as "domino transplant." Amazing!

Question: What's some pain relief you must really believe in?