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The next time you place your coffee order, imagine slapping onto your to-go cup a sticker that acts as an electronic decal, letting you know the precise temperature of your triple-venti no-foam latte.

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Those "sell by" or "best by" dates that you see on food packaging? They're so last century. In the future, built-in sensors in food labels will not only tell you when a product is going bad but also ...