Countless times in recent months in cities of India and many other parts of the world, emergency notifications have jolted people out of their comfort zones. Whether eventually they turned out to be hoaxes or not did not matter at the time that the alert came in. What counted was how efficiently people, whether residents, students or workers, could be evacuated from a potential danger zone to safety.When alarms sound, and crowds surge toward exits, the difference between chaos and controlled eva
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