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Dr. Serge Voronoff was a pioneer in the field of organ transplant who was lauded as a genius in the late 1800s. His experiments included grafting monkey testicles into men, monkey ovaries into women, and human ovaries into monkeys. The purpose of the testicle transplants was â€œrejuvenationâ€ and to slow the aging process, which didnâ€™t quite work out. Link -via Look at This