A dense suspension of negatively phototactic unicellular algae surrounded by a circular array of LEDs (not shown). Selected for an Editors’ Suggestion.

From the article:

Pure Hydrodynamic Instabilities in Active Jets of Puller Microalgae
Isabelle Eisenmann, Marco Vona, Nicolas Desprat, Takuji Ishikawa, Eric Lauga, and Raphaël Jeanneret
Phys. Rev. Lett. 135, 198301 (2025)

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