Homer called salt a divine substance. Plato described it as especially dear to the gods. Today we take salt for granted, a common, inexpensive substance that seasons food or clears ice from roads, a word used casually in expressions ("salt of the earth," take it with a grain of salt") without appreciating their deeper meaning. However, as Mark Kurlansky so brilliantly relates in his world- encompassing new book, salt—the only rock we eat—has shaped civilization from the very beginning. Its story is a glittering, often surprising part of the history of mankind. Until about 100 years ago, when modern chemistry and geology revealed how prevalent it is, salt was one of the most sought-after commodities, and no wonder, for without it humans and animals could not live.
