Salt

“A country is never as poor as when it seems filled with riches.”

At about this time the Asiatic wolf, a fierce predator that despite its small size would eat a human if it had the opportunity, came under human control because its friendly young cubs could be fed and trained.

Salt is so common, so easy to obtain, and so inexpensive that we have forgotten that from the beginning of civilization until about 100 years ago, salt was one of the most sought-after commodities in human history.