“The J-shaped spine is what you see in Greek statues. It’s what you see in young children. It’s good design.” But it’s not what you see in the mirror (or, more likely, in the screen of the device with which you’re taking a selfie.) Back pain is a scourge in places where this newsletter is being read. But that’s not true in some indigenous cultures where people seem to be working a lot harder but having no pain. An acupuncturist, and spine guru to many tech companies, went to see why people who carry buckets of water on their heads and cradle firewood in their arms don’t have pain … and how we can emulate them.