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When Joz Wang and her brother bought their mom a Nikon Coolpix S630 digital camera for Mother’s Day last year, they discovered what seemed to be a malfunction. Every time they took a portrait of each other smiling, a message flashed across the screen asking, “Did someone blink?” No one had. “I thought the camera was broken!” Wang, 33, recalls. But when her brother posed with his eyes open so wide that he looked “bug-eyed,” the messages stopped.