Today (Aug. 16, 2007), the stock market began the day by plunging nearly points because of worries about mortgage and credit woes.  Incredibly, by the end of the day, the Dow Jones Industrial Average gained back nearly all of its loses.  Was this comeback a result of investors working through their worries (in a couple of hours no less) or government intervention?  Ever heard of the President's Working Group on Financial Markets or the Plunge Protection Team?