general_fact: 40 is the number of attempts needed before the creation of the "water displacing" substance in the spray WD-40.
math_fact: 40 is a repdigit in base 3 (1111) and a Harshad number in base 10.
trivia: 40 is the number of positions on a number of radio countdown programs, most notably American Top 40 and American Country Countdown.
historical_date: February 9th is the day in 1996 that the Provisional Irish Republican Army declares the end to its 18 month ceasefire and explodes a large bomb in London's Canary Wharf.