general_fact: 4016 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 4016 is an unremarkable number.
trivia: 4016 is an unremarkable number.
historical_date: December 29th is the day in 1876 that the Ashtabula River Railroad bridge disaster occurs, leaving 64 injured and 92 dead at Ashtabula, Ohio.