There are plenty of finer gradations. I got 'critically endangered/extinct in the wild' on my exam, although the curve bumped it all the way up to 'venti.'

"Universal Rating Scale", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License

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There are plenty of finer gradations. I got 'critically endangered/extinct in the wild' on my exam, although the curve bumped it all the way up to 'venti.'