Our project is about a twinned workshop between our 2 schools. The workshop's purpose is to let students discover what math research and investigation is using a foreign language. We work as well in close cooperation with a university researcher who provides the topics and open problems. Twinned teams of french and romanian pupils work on the same problem and exchange through virtual and presential meetings. They eventually present together their work orally during an international Maths en Jeans congress and publish a scientific article.