What Algorithms Know About You Based on Your Grocery Cart

And more strange tales from the Wild West of data

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Anyone who has ever visited Jones Beach on Long Island, New York, will have driven under a series of bridges on their way to the ocean. These bridges, primarily built to filter people on and off the highway, have an unusual feature. As they gently arc over the traffic, they hang extraordinarily low, sometimes leaving as few as nine feet of clearance from the tarmac.

There’s a reason for this strange design. In the 1920s, Robert Moses, a powerful urban planner in New York, was keen to keep his newly finished, award-winning state park at Jones Beach the preserve of white and wealthy Americans. Knowing that his preferred clientele would travel to the beach in their private cars, while people from poor black neighborhoods would get there by bus, Moses deliberately tried to limit access by building hundreds of low-lying bridges along the highway. Too low for the 12-foot buses to pass under.

Racist bridges aren’t the only inanimate objects that have had quiet, clandestine control over people. History is littered with examples of objects and inventions with a power beyond their professed purpose. Sometimes it’s deliberately and maliciously factored into their design, but at other times, it’s a result of thoughtless…