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First human heart transplant: In 1967, Christiaan Barnard performed the first successful human heart transplant, a groundbreaking surgery that revolutionized the field of medicine. The recipient, Louis Washkansky, lived for 18 days after the procedure, demonstrating the potential of organ transplantation to save lives. Barnard's pioneering work paved the way for countless subsequent heart transplants and other life-saving surgeries.