As I was driving home from work today I caught part of Science Friday on NPR. If you've never listened, I highly recommend it - as their tagline suggests, it aims to " [make] Science User-Friendly" which is something I can get behind.
At any rate, the story that caught my attention was about ZOMBIE RATS. Well, not really I guess. But they did take a dead rat heart and made it beat again. Pretty amazing, huh? The way they did it is really clever and kind of sci-fi: they took a heart from a dead rat, washed it of its cells, and then put new cells in the "ghost" heart. The new cells grew and the heart started beating (it took a couple of weeks, but still, that's pretty amazing).
As a side note, the heart looks really cool all cleaned up. Kind of like blown glass.
You can read about the science and watch the video here.