Time to give that pointer finger a rest. Polara, the Corona missile and medical company that manufactures the signals for most of L.A.’s 18,000 crosswalks, uses robots to test the buttons, poking each model 300 million times—but pedestrians need do it only once. A single push disrupts the electrical current in the wires, triggering a controller that changes the light. Now if it could just zap away our impatience.
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