We all like to think of ourselves as strong, independent and single-minded individuals. But despite our illusion of free will, despite the seemingly random sets of circumstances that bring about our decisions, our behavior as humans is surprisingly easy to predict. But what about if we go beyond the superficial, past correlations and pattern recognition and get right into the heart of who we are as humans. Are there stories hidden in our data that will surprise us? How can they be used against us? And can we use what we learn about ourselves to make the world better? In this talk, I'll take you on a tour of the intriguing insights we've uncovered by looking at ourselves through the eyes of data. For good or for bad, I'll show you how a mathematical view of what it means to be human is already shaping the way we design our society.