A behind-the-scenes look : Business reporter Samantha Liss and business columnist David Nicklaus talk about what the sale of the largest public company ever to call St. Louis home means to the region and consumers, and give a glimpse into the reporting that went into the Post-Dispatch's coverage of this big story -- Express Scripts employs about 4,700 people locally and is being sold to Cigna in a $67 billion deal.