Pick up almost any connected product — a fitness band, a smart lock, a set of wireless earbuds, an industrial sensor reporting to a phone — and somewhere inside it is a radio that traces its name to a 10th-century Danish king. Bluetooth, the short-range wireless standard now embedded in billions of devices, is named after Harald "Bluetooth" Gormsson, and the reason it carries that name is worth more than a piece of pub trivia. It's a small lesso…
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