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Invisible yet incredibly powerful, microorganisms have always been our companions. In this episode, Alberto Angela leads us on a journey to discover these infinitely small creatures, showing us how our lives, and sometimes even our deaths, depend on them. Ulysses's journey begins in Benin, where Alberto Angela introduces us to a very poor country that, like many other places on the planet, represents the "front line" in the fight against microbes and viruses: the place where the battle rages the fiercest, even though the war affects all of humanity.
