A team of scientists at Princeton University--along with one very savvy high school student--have managed to create a truly bionic ear. It's not just a replacement--it has sensors woven throughout the tissue that actually enhance its hearing abilities.

In recent months, it's been proven possible to run living cells through a 3-D printer and keep them viable, which has some pretty amazing possibilities for bionics. This team at Princeton took it a step further by being the first to actually weave sensors, in the form of silver nanoparticles, into the printing process. This isn't an ear with an antenna on it; it's a seamlessly integrated bionic ear.