After pleading guilty to 11 felony counts in federal court today, Bernard Madoff did not go home to his Upper East Side apartment, but to jail, until he is sentenced on June 16. In the courtroom, he explained how his scheme worked and what he did with the money. Madoff cheated 4800 people out of billions of dollars. Is it possible he did it alone? How could the SEC have investigated and found nothing wrong? Is it enough to blame him? What's being done to make sure this doesn't happen again?