Well, I'll be pickled! We say we'll take something with a grain of salt as if it's nothing, but much of the history of the world is tied up in the quest for salt. It's not nothing. We're fortunate to have it in such abundance that we can take it for granted and worry about getting too much of it in our diets. For most of human existence that was not the case. The material here is thorough and often fascinating, but you must have a strong interest in history if you hope to get through it. Had I tried to read it in print rather than listening to the audio book, I may not have stayed with it. It's quite thoroughly thorough, right down to ancient and modern recipes for salty foods that sound mighty revolting. The quality and style of presentation in the book is similar to Bill Bryson's, but without the humor. It's hard to believe this was written by the same guy that put together that goofy book made up of nothing but questions.