general_fact: 1455 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 1455 is the number of subgroups of the symmetric group on 6 symbols.
trivia: 1455 is an unremarkable number.
historical_date: December 25th is the day in 2004 that Cassini orbiter releases Huygens probe which successfully landed on Saturn's moon Titan on January 14, 2005.