Should I Invest in Gold? Learning more about gold and its history may help you decide whether it has a place in your portfolio. Share | Have A Question About This Topic? Name Email Address Question Thank you! Oops! Related Contents The Rule of 72 Do you know how long it may take for your investments to double in value? The Rule of 72 is a quick way to figure it out. Estimating the Cost of College This worksheet can help you estimate the costs of a four-year college program. 5 Smart Investing Principles Principles that can help create a portfolio designed to pursue investment goals.