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In the software used in a call routing center in Englewood, Colorado, there was a programming error in a single piece of software. Sounds minor, but this error could have had horrible implications: it knocked out 911 service to 11 million people in Washington state, North Carolina, South Carolina, Pennsylvania, California, Minnesota, and Florida for six hours in April. More than 5,600 calls in affected areas didn’t go through. How did this happen, and can we prevent it from happening again? [More]