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While most might consider this to be a modern invention , the oldest prosthetic was discovered on an Ancient Egyptian female mummy in 2011 , according to The Lancet . The mummy had two prosthetic toes made of leather and wood . Researchers were skeptical as to whether the toes were actually functional or were created for purely cosmetic reasons . This led researchers to test them out on people who needed a spare toe ( or two ) and it was discovered that the ancient prosthetic toes really do work and can help people walk again . Today , prosthetics come in many forms , including artificial limbs , hearing aids , knee replacements , dentures and artificial heart valves .

26 June 2015