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Not only are planes one of the most widely used modes of word travel transportation, but their potential to carry millions of people (and their diseases) from one side of the world to the next within a day carries exorbitant risks. This is why the zombie apocalypse scenario seen so much in movies these days is realistically scary — not because of the zombies, but the rate at which a deadly disease could spread throughout the world without the proper precautions in place.
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