general_fact: 1947 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 1947 is the number of planar partitions of 16.
trivia: 1947 is a boring number.
historical_date: April 30th is the day in 1993 that Monica Seles is stabbed by Günter Parche, an obsessed fan, during a quarterfinal match of the 1993 Citizen Cup in Hamburg, Germany.