Dancing Droplets

The American Physical Society's annual Division of Fluid Dynamics Meeting is well underway in Pittsburgh this week, and it's showcasing a slew of gorgeous videos contending for prizes in the Gallery of Fluid Motion.We've featured a few of these videos in the past few weeks, and we've got another beautiful example today. Today's video covers the spontaneous motion of dyed liquid droplets as they interact with one another. Surface tension causes the droplets to dance, kiss, and stride along flat g...