In cosmopolitan hubs like London, Paris, and Glasgow, the east side of town contains the poorer neighborhood. But the pattern holds true in Toronto, Casablanca, and Helsinki, too, even if each place has a distinct history and shape. Economists from the University of Bristol and the University of St. Andrews tested one of the more popular explanations for this pattern by modeling 71 British cities as they existed in 1880 -- and precisely recreating air movements, topography, and the location of 5,000 industrial chimneys, Cheddar investigates the research and explores this urban phenomenon.