general_fact: 536 is the number of ways to arrange the pieces of the stomachion puzzle into a square, not counting rotation or reflection.
math_fact: 536 is the number of solutions of the stomachion puzzle.
trivia: 536 is the number of ways to arrange the pieces of the stomachion puzzle into a square, not counting rotation or reflection.
historical_date: June 19th is the day in 1990 that the current international law defending indigenous peoples, Indigenous and Tribal Peoples Convention, 1989, is ratified for the first time by Norway.