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You cannot compare medical and technological advances that took 50 years starting from 1957 to that of the current medical and technological advances of today and the speed of discovery and application it takes. It's a case of apples versus oranges. Stem cells for hearing loss began in 1997, and already we have seen a few cases where hearing loss improved with the use of adult stem cells seen in medical journals. Adult stems to help improve the heart muscle is just starting in clinical trials now and this was looked into but only 4 or 5 years ago.