Tens of thousands of people around the world receive organ transplants every year. Although the medical know-how for transplanting organs has expanded rapidly, the number of donated organs has lagged. Global figures are hard to come by, but an average of 16 people in Europe and 22 in the U.S. die every day while waiting for a replacement heart, liver or other organ. Moreover, the gap between the number of people who need a new organ and the number of organs available for donation keeps widening.