High school class sets off nuclear explosion

A simulated explosion, that is. Don't panic.

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The LA Times has a story about the author's own struggle with href="http://www.nlm.nih.gov/medlineplus/ency/article/000923.htm">panic disorder and agoraphobia.  
If your country had thousands of cases of a potentially fatal disease, spread by mosquitoes, would you panic? Not if you lived in the US, apparently. Last year there were over 4200 cases of West Nile virus infections with 177 deaths. I don't remember panic gripping the nation.
Sometimes  I see news about upcoming drugs, and hope that it works out.  Sometimes, I don't see the point.  Rarely, I actively hope that it does not work out.  Staccato® alprazolam is one that I hope does not work out.  
The easiest way for public officials to scare the crap out of people is to tell them "not to panic." A variant on this is, "It's not time to panic," implying that there will be such a time or that there is ever such a time.