Your social security number is now a part of almost every form, including health insurance paperwork and the application for your library card. In fact, researchers reporting in this week’s issue of the journal the Proceedings of the National Academy of Sciences used public data (hello, Facebook) to predict the first five digits of a person’s social security number. And they got it right, on the first try, 44 percent of the time. With more on the dangers of our less-than-private individual identification system, The Takeaway is joined by privacy expert Peter Swire.