When Jon Acuff's book Soundtracks, came out, one reaction surprised him. Parents across the country all said the same thing: "Do you have a version for teenagers? If I knew how to change my mindset when I was that age, my entire life would have been different." Why did they say that? Because truth grows like compound interest. Saving money when you're young has a bigger impact than it does when you save in your 40s. A single new soundtrack--Acuff's...