Table salt today is so common, it becomes another thing we take for granted. You go to the store, pick a cylinder or jar of salt off the shelf, then go home. You don’t even think about it. Now, consider that 1,000 and more years ago, if a person wanted to use salt on his dinner, this required some prior work. A lot of work! The Romans boiled seawater in huge, lead-lined pans. So valuable was salt in the Roman Empire, it was used as currency! Mainly, it was used as a critical food pre...