The Fight Over Sunlight

The sun has always been a hot topic. For centuries, we’ve flip-flopped over whether our health depends on soaking up its rays—or shielding ourselves from them. The current conventional wisdom is clear: Avoid sunburns at all costs, using shade, hats, long sleeves, and the highest SPF sunscreen your drugstore has to offer. But in a historical sense, that advice is pretty new. Not long ago, doctors…