When droplets walk across a liquid surface

When a container of silicone oil or other similar liquid is vertically shaken at a regular frequency, 1-millimeter-sized droplets of the same liquid placed on the liquid's surface appear to "walk" across the surface at speeds of about 1 cm/second, propelled by their own waves. In a new study, physicists have found that these walking droplets can be much larger (up to 2.8 mm in diameter) and faster (5 cm/second) than previously observed. These "superwalkers" exhibit a wide range of never-before-seen behaviors, including novel synchronized movements.

source https://www.lifetechnology.com/blogs/life-technology-news-blog/when-droplets-walk-across-a-liquid-surface