general_fact: 2090 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 2090 is the number of possible rows in a 17×17 crossword puzzle.
trivia: 2090 is a boring number.
historical_date: September 20th is the day in 1973 that Billie Jean King beats Bobby Riggs in The Battle of the Sexes tennis match at the Houston Astrodome in Houston, Texas.