general_fact: 15072 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 15072 is an unremarkable number.
trivia: 15072 is a boring number.
historical_date: April 6th is the day in 1888 that Thomas Green Clemson dies, bequeathing his estate to the State of South Carolina to establish Clemson Agricultural College.