Things learned while building the tests — that Gyeongsang dialect endings follow rules, why Jeju is classified as a language rather than a dialect, and so on.
Building a test means writing the questions, and writing questions means learning the subject first. The findings from that process that felt too good to keep to myself end up here.
These aren't how-to guides for the tests. Building the dialect quiz taught me that Gyeongsang endings split by sentence type; building the reaction-time game sent me looking into what human response time is actually made of. That leftover material is what these posts cover.
What was verified and what was guessed are kept separate. Sourced claims say where they came from, and numbers I measured or counted myself are labeled as such. Each new test tends to raise a new question, and the list grows by one.