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(Which is what we do for earthquakes, tornadoes, tsunamis, hurricanes, even nuclear power plant emergencies for communities nearby. And what we used to do for nuclear weapons...)
The problem with the way it is currently being done is that occasionally the gov't will put out some "get inside stay inside stuff," but it's not really done in an impactful way. Research by my colleagues here suggests that vast majority of Americans are not familiar with phrase.
Did not the Hawaii EMS provide a useful data point?
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