When it comes to investing in a turbulent market, is ignorance bliss? According to a new survey by IBM, around half of U.S. investors have never heard of Federal Reserve Chairman Ben Bernanke. This, despite the fact that 67 percent say the global financial crisis has prompted them to pay greater attention to financial news. More than one-third could not identify the current unemployment rate. In case you missed it, the jobless rate eased to 10 percent in November after hitting a 26-1/2-year high of 10.2 percent in October.