Salesmen flogging digital cameras boast of the number of pixels in the images captured as an indicator of quality. The more pixels there are-and they are usually counted in the millions—the better the picture. That may cease to be the case. Scientists have devised a way to get the same quality using a single pixel. And it gets better-the new camera will need less memory and power, and may be able to capture images at wavelengths that could prove useful for airport security.
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