Mary Schapiro is stepping down as head of the Securities and Exchange Commission next month. Did you shop on Black Friday? Americans spent almost 13 percent more over the holiday weekend than last year. And today is Cyber Monday, known as the busiest online shopping day of the year. even though the concept is still a relatively new one, the face of Cyber Monday is already changing. Plus stories on the "climate cliff," protests in Egypt, Detroit on the verge of bankruptcy, and a cheese "revolution."