https://en.wikipedia.org/wiki/Surface-to-air_missile https://en.wikipedia.org/wiki/Surface-to-air_missile I know the train of thought. Once I spent hour thinki

https://en.wikipedia.org/wiki/Surface-to-air_missile https://en.wikipedia.org/wiki/Surface-to-air_missile I know the train of thought. Once I spent hour thinking of "design dirt" that sticks to machine parts and protects them from real dirt and oxidation. Then it occurred to me that it's called "paint".