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The last bastion of privacy.

John Ellis
Mar 28, 2023
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1. A last bastion of privacy, our brains have remained inviolate, even as sensors now record our heartbeats, breaths, steps and sleep. All that is about to change. An avalanche of brain-tracking devices—earbuds, headphones, headbands, watches and even wearable tattoos—will soon enter the market, promising to transform our lives. And threatening to breac…

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