math_fact: 28858 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
trivia: 28858 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: January 3rd is the day in 1996 that the Motorola StarTAC, the first flip phone and one of the first mobile phones to gain widespread consumer adoption, goes on sale.