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However you choose to store your pictures – on film or microchip – you may still lose that picture of a lifetime while fumbling for the “shoot” button. The answer is to make a camera that takes a picture when you blink, says Hewlett-Packard (GB 2 380 551). A low-power LED in a viewfinder shines on the user’s eyeball while a photosensor registers the reflection. Blinking changes the reflected pattern. The camera interprets a short blink followed by a long one as a “shoot” command. An optional setting lets it take pictures automatically if it senses a rapid series of…