What you don’t know won’t hurt you, right? That depends. In Thomas Eaton’s “Book of Secrets” hundreds of mysteries are revealed, from government cover-ups to marketing tricks to Colonel Sander’s secret recipe. For instance, did you know that in 1966 the U.S. government smashed a bacteria-laden light bulb inside the New York subway system? Uncle Sam ain’t so sweet, is he? Practical secrets are also revealed, such as how to obtain a flight upgrade, speak in public, or win friends and influence people.