New Scientist TV: Fluid nature: Psychedelic jellyfish dance for dinner: "They injected fluorescent dyes in to the sand below the creatures, revealing the flow of fluid around them. Vortex rings appeared as the jellyfish retracted their arms, and then broke up into smaller structures as they passed over their tentacles. Currents mixed significantly above the arms, and pulsing helped drive flow down through them.
Simulations also helped uncover the flow around jellyfish."
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