math_fact: 7557 is a palindrome that is the sum of the first 37 palindromes.
trivia: 7557 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: September 8th is the day in 1810 that the Tonquin sets sail from New York Harbor with 33 employees of John Jacob Astor's newly created Pacific Fur Company on board.