Bryan Johnson, the tech entrepreneur and so-called biohacker, said he poured millions of dollars into studying and perfecting his own body, and calls himself the most measured human being in history, at almost 49. After what he called his "bad news," what had become of the World’s Healthiest Man?
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He Said He Was the World’s Healthiest Man. Then Came a Stunning Diagnosis.
Bryan Johnson, the longevity guru, wants to live forever. But the big question is why.
