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Now Playing: 2-4-13 Marketplace

In the first in a series of profiles about disappearing professions, a film projectionist says his predecessors had promised him a life-long career. As the Dow Jones Industrial Average hovers near 14,000 points, Mark Garrison reminds us that good news is often scary. A digital advertising director talks about whether Twitter ads during the Super Bowl might have delivered more bang for the buck than the flashy spots on TV. Smart security cameras aren't only capturing you as you walk into a store -- they're capturing your data too. And Dan Bobkoff reports on a school in New York experimenting with paying its teachers very, very well.