A celebration of 25 years of the Tribology Group: From tribo-physics to tribo-chemistry - Guest Editorial

The first meeting of the Institute of Physics Tribology Group was held at Cranfield, UK, in 1980 entitled 'Tribology: Contrasts in Frictional Processes'. The first chair of the Group was David Tabor who subsequently edited the proceedings of the 10th anniversary celebration of the formation of the Group which was held in Stratford-upon-Avon in 1991 and published by this journal as a special issue in 1992. This Special Cluster celebrates the continuation of this thriving Group and the work of some of our leading tribologists in the area who have contributed to the Group meetings in recent years. In particular, we are greatly pleased to have papers from young researchers in the field who will take this subject forward in different directions in the coming decades