Summary: Assets in ETFs soared 58 percent between 2011 and 2013, while mutual funds rose only 36 percent. They are often compared to mutual funds. But they can be very different.Today's Stocks & Topics: Social Security, When to Worry about the Stock Market, Smart Money, Shell Oil, CSCO - Cisco Systems Inc., EXPD - Expeditors International of Washington Inc., Retirement, Gold, GGN - GAMCO Global Gold Natural Resources & Income Trust, GLD - SPDR Gold Trust, SHLD - Sears Holdings Corp., Leverage.
