general_fact: 572 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 572 is the smallest number which has equal numbers of every digit in bases 2 and 3.
trivia: 572 is a boring number.
historical_date: July 25th is the day in 1797 that Horatio Nelson loses more than 300 men and his right arm during the failed conquest attempt of Tenerife (Spain).