general_fact: 42 is the number of museums in Amsterdam (Netherlands has the highest concentration of museums in the world).
math_fact: 42 is the product of the first three terms of Sylvester's sequence; like the first five such numbers it is also a primary pseudoperfect number.
trivia: 42 is the answer to the Ultimate Question of Life, the Universe, and Everything.
historical_date: February 11th is the day in 1889 that Meiji Constitution of Japan is adopted; the first Diet of Japan convenes in 1890.