Threshold Care has announced a new kind of smart plug that promises to make it easier for people to provide elder care. The company’s Motion Wi-Fi Sensing Plugs watch for real-time disruptions in a home’s Wi-Fi network that indicate someone has been moving around the house, and they send notifications in the absence of activity. For today’s seniors, aging in place is vastly preferable to checking into a nursing home. But doing so successfully almost always means having someone check in on them from time to time. Their adult children typically perform this role, but neither caregivers nor the c…