Just how much of the human body can you replace or augment: seemingly everything apart from the tadpole like remnants of the brain and spinal chord.Bionic eyes, ears, hearts, lungs, kidneys, livers, hands, feets, legs, arms and skin are now real science rather than concept designs. For this list, we have gathered together as many real devices including commercially available products rather than concept designs or imagery that appeal based on gimmick value. The one exception is the tooth and ear cellphone implant which is feasible today.An interesting idea is how the notion of a cyborg might change (often imagined as fusion of mechanical and electronic technology with human biology), since many of these devices use technology that is itself principally biological, such as stem cell lines in the bioreactor liver or artificial skin.