The Insecure Social Security Number
The United States would never require its citizens to carry a national identification card — but only because you Social Security number already acts as one. While it isn't quite as Big Brother as it sounds, your Social Security number is really good at proving that you are you, but it's really bad at being secure. CGP Grey digs into Social Security and how it went from a mandatory retirement program to the one thing that you absolutely don't want anyone to know.