Yahoo! editors have selected this article as a favorite of 2012. It first appeared on Yahoo! Finance in September and was one of the most popular stories of the month. Readers joked about people who use the most common PIN codes, and shared how they came up with their own. "My pin number is my post office box number from my time in the Air Force 30 years ago on a base that no longer exists," wrote user Nick. "Feel free to hack that." If you lost your ATM card on the street, how easy would it be for someone to correctly guess your PIN and proceed to clean out your savings account? Quite easy, according to data scientist Nick Berry, founder of Data Genetics, a Seattle technology consultancy.
