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The official channel of the France 3 show. C'est pas sorcier, the magazine of discovery and science. In this second part, our wizards explain to us how we acquire a language, how our memory works, what intelligence is and whether we can measure it. To understand everything about the issue, they went to explore their childhood memories... What are the stages of development of the fetus' brain? What role does the environment play in the development of the child? What are the areas of the brain that are activated when we read or when we speak? Why do we have a short-term memory that quickly makes us forget certain information? How are our old memories stored? What are the processes that make these memories emerge?