The Power of Compound Interest Test Your Investment Knowledge! How much do you know about investing? Take our quiz and find out instantly. First Name Last Name Email Address Thank you! Oops! Learn how to harness the power of compound interest for your investments. Share | Have A Question About This Topic? Name Email Address Question Thank you! Oops! Related Contents Saving for College 101 Here’s a crash course on saving for college. Life and Death of a Twenty Dollar Bill How long does a $20 bill last? Doubling Your Money This calculator demonstrates the power of compound interest.