This article is part of our exclusive IEEE Journal Watch series in partnership with IEEE Xplore.Wi-Fi signals today primarily transmit data. But these signals can also be used for other innovative purposes. For instance, one California-based team has proposed using ambient Wi-Fi signals to monitor a person’s heart rate. The new approach, called Pulse-Fi, offers advantages over existing heart-rate-monitoring methods. It’s low-cost and easily deployable, and it sidesteps the need for people to str...