The journal Nanoscale Horizons features on its inside front cover the recently published research article “Supramolecular nanocapsules as two-fold stabilizers of outer-cavity sub-nanometric Ru NPs and inner-cavity ultra-small Ru clusters”, a collaboration between Université de Toulouse and the group of Xavi Ribas. The synthesis of metallic nanoparticles (MNP) with high surface area and controlled shape is