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Engineers have developed printable metal tags that could be attached to plain objects, like water bottles, walls or doors, and turn them into ‘smart’ Internet of Things devices. The tags can also be fashioned into paper-thin control panels that can be used to remotely operate WiFi-connected speakers, smart lights and other smart home appliances. The metal tags are made from patterns of copper foil printed onto paper-like materials and disturb WiFi signals when touched.