This technology-focused ETF has delivered returns close to double those of the Dow over the past decade. If you have a passing interest in stock markets and indexes, you may be familiar with the Dow Jones Industrial Average. It's often viewed as a proxy for the entire U.S. stock market, but it really shouldn't be. You might also know that it's smart to invest in index funds, and that's very true. But don't go looking for an index fund that tracks the Dow Jones. Instead, here's an index fund with a stronger ...