math_fact: 48738 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 48738 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: June 9th is the day in 1968 that U.S. President Lyndon B. Johnson declares a national day of mourning following the assassination of Senator Robert F. Kennedy.