Not sure why the downvote, but this is what I was thinking about: https://en.m.wikipedia.org/wiki/Fluid_dynamics https://en.m.wikipedia.org/wiki/Fluid_dynamics

Not sure why the downvote, but this is what I was thinking about: https://en.m.wikipedia.org/wiki/Fluid_dynamics https://en.m.wikipedia.org/wiki/Fluid_dynamics Nothing to do with origins of flight but interesting and related to why flight works.