The Queensbridge Houses, the largest public housing complex in the country, near the spot where Amazon plans to put a new headquarters. Mark Lennihan/AP hide caption
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Our choice of snacks is influenced by gender, age, income and even cultural flavor preferences. Maanvi Singh/for NPR hide caption
Morehouse College freshmen Philip Rucker, Damon Redding and Tyree Stevenson use a programming language called Python to plot a map of weather stations in the United States. Tasnim Shamma/WABE hide caption
Software coders (from left) William Stevens, Michael Harrison and Brack Quillen work at the Bit Source office in Pikeville, Ky., in February. The year-old firm has trained laid-off coal workers to become software coders. Sam Owens/Bloomberg via Getty Images hide caption
By clicking "Like" and commenting on Facebook posts, users signal the social network's algorithm that they care about something. That in turn helps influence what they see later. Algorithms like that happen all over the web — and the programs can reflect human biases. iStockphoto hide caption