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Major earthquakes can claim thousands—sometimes tens, or in the case of Haiti in 2010, hundreds of thousands—of lives. As deadly as big trembles can be, their seriousness is magnified when they strike densely populated, urban areas. Surprisingly, we humans keep building and rebuilding major cities in areas that are particularly vulnerable to seismic disasters. If you live in one of these cities, you had better know what to do when an earthquake rocks your hometown.