I can't remember who first said it (and I couldn't find it with a perfunctory Google search, so I might be misremembering something), but I think I heard it said that "the greatest proof of intelligence is the ability to hide it". If so, then Cirno is the least ⑨ of all!
How to rule the Gensokyo without attracting attention of paramedicsCirnoMaths classPublic page on VK social networkA Certain Scientific Cirno
Vk community where pics of Cirno together with summaries of scientific articles are posted