Researchers from Swiss technology institute ETH Zurich have 3D-printed an artificial heart that could one day become a transplant for patients in need. It was made from silicon using a 3D printer, and looks as well as functions just like a real human heart. The 390 gram heart has a left and right ventricle separated by an additional chamber inflated and deflated with air pressure, similar to the pump action of the human heart. "This was simply a feasibility test. Our goal was not to present a heart ready for implantation, but to think about a new direction for the development of artificial hearts," said researcher Nicholas Cohrs. Click here for the first picture in today's viral picture gallery. Continue reading for a viral video of NASA's mind-blowing New Horizons flyover of Pluto.