Cold-water bathing has a long history as a health hack. The ancient Greeks and Romans partook to treat fevers. Eighteenth-century mental institutions employed a tactic called the bain de surprise , suddenly dunking their patients in cold water to jolt them out of their depression or psychosis. (Some doctors aimed to wet only the head to cure “hot brain.”) Last year, Mehmet Oz, the celebrity doctor who is now the head of Medicaid and Medicare, posted an Instagram video of himself in a one-man

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