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The concept is simple and alluring: There are special regions around the world — called blue zones — where people regularly remain vibrant and active into their 90s and 100s, thanks to a simple set of behaviors that anyone can follow. It’s sensible enough to sound convincing, and ambiguous enough …

When Oscar Brann imagined retirement, he pictured days spent fishing with his grandson, or doing yardwork at his home in Skowhegan, Maine. But itchy and flaky red rashes appeared across his body a few years ago, making it excruciating to move, he said. The pain forced Mr. Brann, a 62-year-old …

When Mel Cassidy first became curious about nonmonogamy, there weren’t many helpful resources. Most of the books focused on the transition from monogamy to nonmonogamy, but Cassidy, who goes by them/them pronouns, was “freshly divorced, hadn’t really dated as an adult.” “I was winging it,” said Cassidy, who has since …