The Federal Reserve has made public an enormous trove of data about the emergency measures it took during the worst of the credit crunch and the ensuing recession. It's confusing stuff: arcane spreadsheets showing more than 21,000 transactions totaling more than $3.3 trillion via an alphabet soup of programs. Still, the revelations provide a fascinating glimpse into the workings of the Fed in the apocalyptic days of 2008, when the world economy was on the verge of collapse. ...Why did the notoriously shy Fed post the detailed data this week? Because Congress forced it to.