 So, just to give you a brief overview of the six factors we can see have an impact on why some countries do better than others and we'll dive into them in the chapters to come, but we can see, I'm sorry to say this and burst your bubble, but money does matter. It's really complex and there's a lot of nuances there, but we can see that richer countries, richer people are on average happier. But again, a lot of nuances, so we'll get into that. Secondly, health. Obviously, if we are ill, if we are sick, we are less happy, but there's a dual relationship there, which we'll also go into. Thirdly, we can see that freedom matters, the American Declaration of Independence, life, liberty and the pursuit of happiness, those things are linked. We can see that people that feel in charge of their lives, that feel as captain of their destiny, are on average happier. We'll get into that as well. Fourthly, we call it the fourth factor, different things. We call it freedom from corruption. We call it good governance. We call it high level of trust. So, do people trust their governments? Do they trust the institutions? Do they trust the neighbors? Do they trust people on the street? That creates a more convenient society and a less worryless society. Sorry, English is not my first language. And then, fifthly, we can see the level of generosity, the level of kindness in a society matter, how we treat one another. And that links into the sixth factor. We can see also have a tremendous impact and perhaps is the best predictor of whether people are happy or not, are relationships. So, the level of social support that we experience.