A new process called Eulerian Video Magnification allows doctors (or filmmakers) to see changes in motion or changes in color that are so small and subtle, they would normally be invisible to the eye. Some music video director is going to do something awesome with this, mark my words. I think this opens up a whole new set of possibilities for filmmakers, just as slow-motion or zoom lenses did.
More about it over at the New York Times, including a video with the MIT scientists who have developed the technique and made their source code available for noncommercial uses. They even tested it on a clip from The Dark Knight. Sorry, the times does not allow the video to be embedded, so you’ll have to click over to watch the cool demos.