In fact when you combine stem cell technology with the technology known as tissue engineering you can actually grow up entire organs so as you suggest that sometime in the future you get in an auto accident and lose your kidney we'd simply take a few skin cells and grow you up a new kidney. In fact this has already been done.

A smartphone links patients' bodies and doctors' computers which in turn are connected to the Internet which in turn is connected to any smartphone anywhere. The new devices could put the management of an individual's internal organs in the hands of every hacker online scammer and digital vandal on Earth.