math_fact: 975 is the number of 11-ominoes that contain 1 hole.
trivia: 975 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: September 1st is the day in 1961 that the Eritrean War of Independence officially begins with the shooting of the Ethiopian police by Hamid Idris Awate.