diff --git a/04.niv4/frontmatter.yaml b/01.curriculum/01.physics-chemistry-biology/04.niv4/frontmatter.yaml similarity index 100% rename from 04.niv4/frontmatter.yaml rename to 01.curriculum/01.physics-chemistry-biology/04.niv4/frontmatter.yaml diff --git a/04.niv4/topic.en.md b/01.curriculum/01.physics-chemistry-biology/04.niv4/topic.en.md similarity index 100% rename from 04.niv4/topic.en.md rename to 01.curriculum/01.physics-chemistry-biology/04.niv4/topic.en.md diff --git a/04.niv4/topic.es.md b/01.curriculum/01.physics-chemistry-biology/04.niv4/topic.es.md similarity index 100% rename from 04.niv4/topic.es.md rename to 01.curriculum/01.physics-chemistry-biology/04.niv4/topic.es.md diff --git a/04.niv4/topic.fr.md b/01.curriculum/01.physics-chemistry-biology/04.niv4/topic.fr.md similarity index 100% rename from 04.niv4/topic.fr.md rename to 01.curriculum/01.physics-chemistry-biology/04.niv4/topic.fr.md