AUTHOR=Cai Li-Heng , Datta Sujit S. , Cheng Xiang TITLE=Editorial: Active matter in complex environments JOURNAL=Frontiers in Physics VOLUME=10 YEAR=2022 URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2022.1005146 DOI=10.3389/fphy.2022.1005146 ISSN=2296-424X