Photoplethysmography (PPG) is an optical sensing technique that measures blood volume changes and underpins devices ranging ...

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Closure can mean finally stopping the emotional replay of a relationship on WhatsApp status, rereading old chats, stalking their Instagram stories, or staring at old photos. Love is sweet, breakups ...

GRIFFITH, Australia—At a tiny airport in the Australian countryside last month, a small plane took off carrying a device that could transform how U.S. drones, aircraft and ships navigate across future ...