Should You Invest in Exchange Traded Funds? There are thousands of ETFs available. Should you invest in them? Related Content 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. Investing with Your Heart For some, the social impact of investing is just as important as the return, perhaps more important. Red Flags for Tax Auditors Here are six flags that may make your tax return prime for an IRS audit.