To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie S3. Experiments and simulations showing the dynamics of transient traveling lines in a Hele-Shaw cell with H 2b. Droplet diameter is 50 microns. Flow-induced phase separation of active particles is controlled by boundary conditions Shashi Thutupalli, Delphine Geyer, Rajesh Singh, Ronojoy Adhikari, and Howard A. Stone PNAS. 2018. 115:5403-5408 DOI: 10.1073/pnas.1718807115 Download Original Video Browse All Videos »