There comes a time when even the most beloved and closely held adages need to be challenged. Take Plato’s “necessity is the mother of invention.” Centuries ago, for example, long before refrigeration, people had to figure out how to preserve food for long periods, especially fallow times, and — boom — salting food, either by packing it in salt (think bacalao) or adding it to a brine (think pickles), was born. I submit that...