The Bad Politics of Bad Posture; There's little evidence slouching is unhealthy. So why do Americans believe so firmly in sitting up straight?

Strangers try to fix my posture. According to them, my shoulders slump, and my neck protrudes on a diagonal, as though I'm constantly reading a book or peering down at a phone screen. My critics come in different shapes and sizes. A chirping young woman at a Brooklyn party asked, "Why can't you stand up straight?" Once, at a friend's wedding, the bride's elderly grandfather pushed my head into alignment with my spine, like Sisyphus rolling a boulder uphill...