How to make the invisible visible

Even when your eyeballs look still, they aren't still. Every time your heart beats, it creates almost imperceptible changes in your skin tone as blood moves through your body. Tall buildings and construction cranes wobble slightly in the wind, even though our eyes can't usually catch them at it. Now, a team at MIT has figured out how to spot these small movements using a computer program that goes through video frame-by-frame and pixel-by-pixel, amplifying minute changes in color and motion and making them visible to us. The New York Times' Bits blog has a video with some awesome demonstrations of the system. Maggie