Last year in the United States, 24,020 people donated their organs for transplantation, around three-quarters of them after death. Organ transplantation may seem commonplace today, but before the 1980s—when the medical community adopted an immunosuppressant drug—the chance of rejection limited how many were performed. This is essentially what’s happening to transplant centers with organ offers—they are fielding more calls and more texts about more organs from more donors at more hospitals. But because the algorithm doesn’t automate the subjectivity, making these calls slows transplant centers down. In 1984, Congress passed the National Organ Transplant Act, which created a national registry for organ matching that would soon be run by UNOS under federal contract.