https://www.sciencedaily.com/releases/2021/08/210831111918.htm
Protruding eyes, mouth make stingrays more hydrodynamically efficient | ScienceDaily
Researchers detail how the protruding eyes and mouths on simulated stingrays affect a range of forces involved in propulsion, such as pressure and vorticity....
eyes mouthprotrudingmakestingrayshydrodynamically
https://arxiv.org/abs/astro-ph/0401457
[astro-ph/0401457] Detection of oxygen and carbon in the hydrodynamically escaping atmosphere of...
Abstract page for arXiv paper astro-ph/0401457: Detection of oxygen and carbon in the hydrodynamically escaping atmosphere of the extrasolar planet HD209458b