See that long string of letters, numbers, and mathematical symbols? That’s the equation researchers from University College, London came up with during a study meant to predict the fluctuation of happiness in situations where expectations were either not met or exceeded. The study started with 26 subjects who were all given a game they could gamble with, that was also tied to an MRI machine. As they played and either won or loss, the participants rated their happiness level from 0 to 10 while the MRI registered brain wave activity. From this study, the researchers were able to deduce that happiness was in correlation with expectations but, most importantly, were able to devise this equation which, when tested on 18,000 people through a phone app, accurately predicted the fluctuation in happiness.