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“extremely rare” is a way of saying second most common that I haven’t heard before.
The rare stone thing would be better for nuclear power. Find lots of rare stone, put it together in a huge pile, they get warm and cause mysterious diseases.
The masks used in litography to compensate distortion of details smaller than wavelength are pretty much at the point of being magic circles.
https://www10.edacafe.com/blogs/editorial/files/2023/03/nvidia.png
