The GDR and GDR-I "graphene and co", supported by the CNRS, organize a summer school "Advanced physics of van der Waals hetero-structures (HOWDI)" in the marine station of Roscoff (Brittany, France), Sept.23, Oct1, 2023. All lectures are in english. Note that this school is eligible for ECTS credits. Ask your University. A maximum of 80 participants will be allowed due to the restricted capacity of the center.