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The obituary had already been written for the wristwatch. Knocked out of commission by smart phones, it slipped in importance from necessity to accessory. But with the advent of the Samsung Galaxy Gear watch, wrist wear could be crawling out of the grave like a zombie from “Night of the Living Dead.” Apple is rumored to be working on its own watch, and after a successful Kickstarter campaign, a watch called the Pebble is also promising to run your apps.