Atomic Cluster Collisions: ISACC 2015

4 pags., 1 fig.The ISACC 2015 brought together nearly a hundred scientists in the field of atomic and molecular cluster physics from around the world. We deliver the Editorial of a topical issue compiling/presenting original research results from some of the participants on both experimental and theoretical studies involving research areas from small clusters to extended molecular systems in the field.We acknowledge support by MINECO Grant No. FIS2014- 51933-P, and conference sponsors (CSIC, RSEF, UAM, MBNRC, EPJD, and City of Madrid).Peer Reviewe