The fast-moving development of brain-machine interfaces got a boost when Elon Musk announced the work for Neuralink, his new company devoted to implantable devices to enhance cognition and better marry our brains with super-computing. His competitor, fellow tech entrepreneur Bryan Johnson of Kernel, weighs in on why he thinks advancing cognition can solve all the other problems in the world. But tech ethicist Tristan Harris says not so fast — we haven’t properly accounted for what existing tech has already done to us. Think things through with this brainy episode of Future You with Elise Hu.

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