Like the Tesla turbine, an engine with only one moving part. https://en.wikipedia.org/wiki/Tesla_turbine https://en.wikipedia.org/wiki/Tesla_turbine (When I w

Like the Tesla turbine, an engine with only one moving part. https://en.wikipedia.org/wiki/Tesla_turbine https://en.wikipedia.org/wiki/Tesla_turbine (When I was a kid this thing was mythological and now it has a Wikipedia page. What a world!)