Middle East & Central Asia: from oil to opium
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Read MoreThe interactive watershed map
This map shows how surface water flows in the U.S. As you move the mouse over the map, the program
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Predominant ancestry in the U.S.
The predominant ancestry in the U.S. is European ancestry. According to the U.S. Census, people of European ancestry make up the largest racial and ethnic group in America, comprising about 60% of the population.
Read MoreOn & Off the street grid: relative distributions of road orientations
Seth Kadish compares the street grids of two dozen urban centers across the United States and Europe. The tallest bar
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