A few weeks ago, a TechStuff fan posted a link to a YouTube video that managed to scare the pants off me (which is why I’m required by HR to wear, at minimum, two pairs of pants when I come to work). The claim in the video was that an inventor had discovered a way to perceive 3-D images on a television screen without the use of active 3-D glasses. Active glasses have shutters in them that open and close faster than we can see. The shutters synchronize with images on the television screen — each eye only sees one set of images. Your brain combines the two sets of images into a single image that appears to have the dimension of depth. The invention in the video seemed to achieve this by making you blink your eyes in sync with the television screen.