A ghost town or alternatively deserted city or abandoned city is an abandoned village, town, or city, usually one that contains substantial visible remaining buildings and infrastructure such as roads. A town often becomes a ghost town because the economic activity that supported it (usually industrial or agricultural) has failed, or due to natural or human-caused disasters such as floods, prolonged droughts, government actions, uncontrolled lawlessness, war, pollution, or nuclear disasters. The term can sometimes refer to cities, towns, and neighbourhoods that are still populated, but significantly less so than in past years; for example, those affected by high levels of unemployment and dereliction.
In physics, the shower-curtain effect is the phenomenon in which a shower curtain gets blown inward with a running shower. The problem of the cause of this effect has been featured in Scientific American magazine, with several theories given to explain the phenomenon but no definite conclusion. As a second meaning, the fact that nearby phase front distortions of an optical wave are more severe than remote distortions of the same amplitude is called shower-curtain effect.
Crise sanitaire, réponse sécuritaire
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