The History of Currency Full Size Version Share | Have A Question About This Topic? Name Email Address Question Thank you! Oops! 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! Related Contents The Power of Compound Interest Learn how to harness the power of compound interest for your investments. How Big is Money? Learn a little about worldwide currency in this fun infographic Doubling Your Money This calculator demonstrates the power of compound interest.