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Stream the full Mankind Decoded Season 1 Episode 4 movie online for free in crystal-clear HD quality. No downloads required—just press play and enjoy the action, complete with English subtitles for an enhanced viewing experience.

The world is linked like never before. Modern transport and communications have resulted in a world that is wealthier, healthier, more mobile and better informed than ever before. But throughout history new trade routes have proved to be double-edged swords, opening the way to wealth as well as terrible dangers--among them revolutionary ideas and terrifying pandemics.