It's being called the "battle of the beards" — Paul Krugman vs. Ben Bernanke. Both are eminent (and bearded) economists: Bernanke, chairman of the Federal Reserve Board; Krugman, a Nobel Prize winner and a prominent New York Times columnist. Krugman accuses Bernanke of being too timid in fighting high unemployment and slow economic growth. Bernanke calls Krugman's policy proposals "reckless." What's going on?