general_fact: 28138 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 28138 is an uninteresting number.
trivia: 28138 is a boring number.
historical_date: January 13th is the day in 1939 that the Black Friday bush fires burn 20,000 square kilometers of land in Australia, claiming the lives of 71 people.