Emission of water (dyed red) from a self-propelled water droplet surrounded by a mixture of oil and surfactant. Selected for a Synopsis in Physics.

From the article:

Straight-to-Curvilinear Motion Transition of a Swimming Droplet Caused by the Susceptibility to Fluctuations
Saori Suda, Tomoharu Suda, Takuya Ohmura, and Masatoshi Ichikawa
Phys. Rev. Lett. 127, 088005 (2021)

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