Congratulations to PhD student Ziwei Guo (郭子威) whose article “Size-asymmetrical Lennard-Jones solid solutions: Interstitials and substitutions” was accepted for publication in the Journal of Chemical Physics (on the first review with no revisions!).  This work explores the extent to which small impurities, which usually occupy interstitial sites in a crystalline solid, may group together to occupy a vacancy in the main lattice as a cluster.