@Jell For my SAT solving exercise, I happened to write (naïvely, and then re-write) a propositional logic data type and some functions (hence my interest in Heyting algebras all of a sudden) and implemented an intuitionistic fuzzy logic (that is not Boolean but Heyting). I can turn that into a meetup presentation as well. Probably not solo, because it will probably be rather too dry for some people. :-)