math_fact: 6176 is the last 4-digit sequence to appear in the decimal expansion of p.
trivia: 6176 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: November 27th is the day in 1963 that the Convention on the Unification of Certain Points of Substantive Law on Patents for Invention is signed at Strasbourg.