ICACS25. An Anniversary

International Conference on Atomic Collisions in Solids (ICACS) is a bi-annual conference that attracts some 100 300 from the field of ion-beam-solid interaction. The conference once in two years, alternating between Europe and overseas, and the proceedings fill a volume or issue of Nuclear Instruments and Methods B (NIMB). The ICACS has been alternating with another bi-annual meeting, the Gordon Research Conference on Particle-Solid Interactions initiated by L. Marton in 1968 and terminated in 1996. Computers play an increasingly important role in ICACS-related topics. Interest in the channeling community turned into high-energy phenomena such as channeling radiation and other crystal-assisted processes at the event during the 1980s.