fire death machine - i made a rocket

The video follows a journey from a SpaceX tour to building and testing a homemade rocket engine. The creator designs a rocket engine using nested tubes and tests it with various fuels and objects, observing phenomena like shock diamonds. The experiments include testing the engine's exhaust on items like steak and coconuts, leading to surprising results. The video concludes with a reflection on the experiments and a mention of new merchandise.

What new insight or understanding did you gain from this video?