This is mostly about aviation. But it is also about the new kind of citizenship promoted on the internet of folks who just share understandings.
John S Denker has written a most thorough manual of flight instruction "See How It Flies". In this he has broken with many long standing traditions and instructional paradigms. Many of the best traditions and paradigms continue in his scheme. He is no anarchist. But he gathers into a new mix, the physics of flight, current accident rates and causes, and a most practical common sense. He is as concerned to communicate how to stay alive as to how to fly the plane. See also his lecture "CFI Seminar - Takeoff, Landing and Maneuvering".
And he makes his book of instruction (and more) freely available! John has a double life as a PhD in Physics and as Aviation Enthusiast. Bio.