Hugh Pickens writes writes: "There has been much speculation regarding the cause of the recent worldwide economic recession, but we all know the truth. It was 'Angry Birds' and its effect on the productivity of the global work force. The 50 million individuals who have downloaded 'Angry Birds' play roughly 200 million minutes of the game a day, which translates into 1.2 billion hours a year, more than ten times the 100 million hours spent creating and updating Wikipedia over the entire life span of the online encyclopedia. Why is this seemly simple game so massively compelling? Charles L. Mauro performs a cognitive teardown of the user experience of Angry Birds by reverse engineering the game to determine what interaction attributes the successful interface embodies that result in a psychologically engaging user experience. To summarize Mauro's detailed analysis, success is bound up in slowing down that which could be fast, erasing that which is easily renewable, and making visual that which is mysterious and memorable. "Over the past 10 years, our firm has conducted user engagement studies on hundreds of user interfaces. The vast number did not get one principle right, much less six," writes Mauro. "You go Birds! Your success certainly makes others Angry and envious.""