If you've ever owned a Tile tracker —a square, white Bluetooth beacon that connects to your phone to help keep tabs on your wallet, keys, or whatever else you're prone to losing—you're familiar with low-power Internet-of-Things (IoT) devices. Just like other small IoT devices, from voice assistants to tiny chemical sensors that can detect gas leaks, Tile trackers require a power source. It's not realistic to hook these gadgets up to a wall outlet, and having to constantly change batteries is a waste of time that's ultimately bad for the environment. But what if you could wirelessly charge those devices with a power source that's already all around you? Researchers at Georgia Tech have dreamed up this kind of "wireless power grid" with a small device that harvests the electromagnetic energy that 5G base stations routinely emit. Just like the 3G and 4G cell phone towers that came before, 5G base stations radiate electromagnetic energy. At
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