general_fact: 40512 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 40512 is an unremarkable number.
trivia: 40512 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: December 1st is the day in 1990 that Channel Tunnel sections started from the United Kingdom and France meet 40 metres beneath the seabed.