general_fact: 1735 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 1735 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 1735 is an uninteresting number.
historical_date: September 30th is the day in 1966 that the British protectorate of Bechuanaland declares its independence, and becomes the Republic of Botswana.