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Influenza is one of the most shape-shifting infectious diseases humans face. Unlike measles or polio—viruses that are relatively stable targets—flu viruses mutate frequently, sometimes subtly and sometimes dramatically. That constant change...
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Long before engines turned wheels and steel rails stitched nations together, there existed a vast web of dirt tracks and mountain passes that bound continents, peoples, and empires. This was the Silk Road—not a single road, but a sprawling network of trade arteries stretching thousands of miles across Asia, linking China to the Mediterranean world. For more than 1,500 years, it was the grand...
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