So much of our human body is made up of salt that we'd be dead without it. The fine balance of nature, the trade of salt as currency of many nations and empires, the theme of a popular Shakespearean play... Salt is bestselling author Mark Kurlansky's story of the only rock we eat. From its single origin, to the other discoveries made because of it, fascinating tales of salt and the people who have been involved with it through the age are interwoven