Today's Stocks and Topics: Natural Gas, Lessons to invest by, Inconsistent Advice, (KTCC) Key Tronic Corp., (AAPL) Apple Inc., (GEMS) PureFunds ISE Diamond Gemstone ETF, (RTEC) Rudolph Technologies Inc., Buy and Sell, Managing Risk, (KOF) Coca Cola Femsa S.A.B. de C.V. ADS.