Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Kurlansky uses salt as a thread to link cultures and history

Salt" takes the reader through thousands of years of human cultural and scientific development, all-the-while making it interesting and accessible. The common character throughout is ordinary table salt, which up until 100 years ago, played a far more important role in human society and economics. Through the use of this everyday material, Kurlansky takes us on a tour that from ancient China and Rome, to Britain's rule of India, into the slave operated salt mines of Europe, down to Avery Island during the American Civil War (and the creation of Tabasco Sauce); all with a focus on the cuisines of those places and times. A long book that I was sorry to finish.