 than some of these other countries, which are low income and some of them are growing very rapidly in terms of population. Yeah. I want to ask you about how you came to these numbers in the first place, because counting people in the United States has always been a contentious and kind of difficult task. And here you are trying to count billions of people around the globe. How do you have confidence that these numbers are correct and that they haven't left out large numbers of people?