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The official channel of the France 3 show. C'est pas sorcier, the magazine of discovery and science. Our three friends offer us a visit to the 3rd city on the planet: Mexico City. They return to the Aztec origins of the city, telling us about the daily life of its inhabitants before the Spanish conquest, then address the current problems of this megalopolis. Where exactly is Mexico City? How did the Aztecs build this city? What did it look like then? How and why did the conquistadors conquer Tenochtitlan, which would later become Mexico City? How did the Spanish drain and then expand the city? What is the current distribution of the population in Mexico City? Why have the needs for water weakened the soil to the point that we see land subsidence of more than 1.20 meters deep? Why is the city so polluted?