general_fact: 2576 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 2576 is an unremarkable number.
trivia: 2576 is an uninteresting number.
historical_date: January 19th is the day in 1840 that Captain Charles Wilkes circumnavigates Antarctica, claiming what became known as Wilkes Land for the United States.