Forbes: The polar vortex gripping the nation has brought a crazy week for natural gas. On Monday the demand for gas nationwide hit a record 125 billion cubic feet as homeowners and power generators sought to burn as much of it as they could get to keep the cold at bay. In a normal early-January week the draw on natural gas inventories is about 170 billion cubic feet. This week, according to market watcher Bentek, the drawdown is expected to be on the order of 310 bcf the most ever. The record demand stretched...