Overview: Learn about the hidden cost of better and faster cell phone service, and about unreliable medical evidence in several child death cases. Six Billion Dollar Bet: Jon Corzine, former head of Goldman Sachs and political power broker, took over MF Global in the spring of 2010 and lost a massive bet on European debt, with more than a billion dollars of customer funds missing. FRONTLINE investigates how Corzine’s traders went around MF Global’s risk officers and how he swayed regulators in Washington to allow risky practices to continue.