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Once Upon a Time... Life
Saison 1 Épisode 8 - Breathing
Peter and Pierrette go on a jogging tour with two friends in the park. They become acquainted with two pulmonary alveoli who are having a conversation about the young runners. Topic: the breathing. Some dust particles and microbes are lurking around with the aim of getting inside the body with the air that's breathed in to cause some trouble there. The sentries are already alert though.