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Researchers devised a system that uses just two sensors placed in a person’s home to determine use patterns of devices including stoves, hair dryers and more. The first location sensor works using radio signals to figure out placement. A second sensor measures energy usage through the home, and combines that data with movement information to matching energy use signals with physical locations of specific devices, to provide data both when a person is using the appliances around the house, and for how long. Read more here