Endofullerenes are substances in which small molecules or atoms are encapsulated in highly sym-metrical cages of carbon atoms. Each encapsulated atom or molecule behaves as a textbook example of a quantized particle-in-a-box. The newest and largest member of the endofullerene fami-ly tree, namely CH$_4$@C$_{60}$, is the first organic molecule trapped inside the cage and the main interest of...
