Emergency doctor Bernard Fontanille sets out to meet one of his former students, Vânia Rabelo, a 32-year-old nurse. For three years, she has been living among the Kaiabis, in the Xingu river basin, gathering experiences linked to culture shock. "Kaiabis women, for example, do not like the umbilical cord to be cut when a child is born. They think it can damage the child's health ", she recounts.