Stocks fell after US worker productivity unexpectedly posted its poorest performance in almost two years with employees apparently unwilling to give their all until it became clear that those pesky Mayans were wrong about the world ending in December. Callaway Golf (ELY) bucked a bad day to end up 3.55% which should please President Obama who apparently finds repeated visits to the golf course to be productive.    Apple Inc. (AAPL) rose 2.97% adding to its $137 billion hoard of cash. This after David Einhorn accused the company burned in the past by money issues of squirreling away assets in the manner of ...