Why the Christmas carol? Well, researchers have come up with a way to use a camera to capture the image in your eye to see what you you are looking at. Useful applications could include: Seeing if your husband is indeed checking out the woman walking past, security applications, and more.
Currently, it involves using a high-resolution digital camera to snap a close-up of a face, though with optical and digital zoom capabilities getting better all the time, one day it is possible that cameras from a distance can determine what you are looking at.
Certainly, this has "Big Brother" written all over it, but it's an interesting technology nonetheless.
Check out the full story below, and make sure to launch the video to see the demo.