Steve W. wrote to mention that he’d found an interesting resource web site with links to appropriate technologies of all sorts: Practical Action.
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Courtesy of Kevin S.: Where have all the MANPADS gone? And here is a related article: Anti-Missile Jammers on Commercial Jets
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A trend to watch? Spokane Tax Assessor Wants Low Altitude High Resolution Photos of Private Property. A hat tip to Chad S. for the link.