That's right - nearly 4 billion people live inside the circle on this world map, including 22 of the world's 37 megacities.
Like the stock market, the greatest empires in history have been cyclical in nature. We look at their rise and fall, and the lessons we can...
This series of maps uses data on Gross National Income (GNI) to classify the world's richest and poorest countries based on four income groups.
This series of images overlays data on the affordability of housing onto maps of Vancouver, the epicenter of Canada's housing bubble.
California has been the victim of years of drought now, and this data visualization series shows the cumulative effects.