IFISC hosts the Complexity72h workshop IFISC (Institute of Cross-disciplinary Physics and Complex Systems, UIB-CSIC) will host the fourth edition of the Complexity72h workshop, which will take place at Palma de Mallorca, Spain, on June 26-30 2023. Complexity72h is an interdisciplinary workshop for young researchers in complex systems. Participants form teams and carry out projects in a three days' time, i.e. 72 hours. The goal of each team is to upload on the arXiv (or similar repositories) a report of their work by the end of the event. The editions of 2018 and 2019 were a success: 11 out of 11 projects have become arXiv preprints and new collaborations have been born. The 2020 edition was canceled due to the pandemic. But we are now back for a 2023 edition, which will take place in Palma (Mallorca, Spain) on June 26-30. Speakers at the workshop will include Márton Karsai (CEU, Austria), Jesús Gómez-Gardeñes (University of Zaragoza, Spain) and James Watson (Oregon State University, USA). The 60 participants will be supervised by researchers Alberto Aleta (University of Zaragoza, Spain), Elsa Arcaute (UCL, UK), Juan Fernández-Gracia (IFISC, Spain), Alessandro Galeazzi (Ca' Foscari University of Venice, Italy), The Anh Han (Teesside University, UK), Giulia Pullano (Georgetown University, USA) and Enrico Ser-Giacomi (IFISC, Spain).The organizing committee includes: Alberto Antonioni (University Carlos III de Madrid, Spain), Sofia Texeira (University of Lisbon, Portugal), Maddalena Torricelli (City University of London, UK), Eugenio Valdano (INSERM, France), Pere Colet (IFISC, Spain) and José Javier Ramasco (IFISC, Spain). The fourth edition of the Complexity72hworkshop is supported by IFISC (UIB-CSIC), Comsotec and the Complex Systems Society (CSS). http://ifisc.uib-csic.es/en/news/ifisc-hosts-complexity72h-workshop/