A couple more interesting things come to mind: https://en.wikipedia.org/wiki/Tesla_turbine https://en.wikipedia.org/wiki/Tesla_turbine https://www.youtube.com

A couple more interesting things come to mind: https://en.wikipedia.org/wiki/Tesla_turbine https://en.wikipedia.org/wiki/Tesla_turbine https://www.youtube.com/watch?v=mrnul6ixX90 https://www.youtube.com/watch?v=mrnul6ixX90 https://en.wikipedia.org/wiki/Tesla_valve https://en.wikipedia.org/wiki/Tesla_valve Also see: Viktor Schauberger (caution: will take you down quite a rabbit hole).