The air in airliner cabins is typically kept very dry. It has to be, in order to stop condensation from accumulating within the plane. Unfortunately, this also dries out passengers' mucus membranes, ...
A vortex gun which can fire doughnut-shaped rings of electrically charged gas could be by firefighters to clear hallways clogged with smoke. The gun fires rings which revolve as they travel but, like ...
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