math_fact: 4928 is a structured truncated tetrahedral number.
trivia: 4928 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: June 28th is the day in 1896 that an explosion in the Newton Coal Company's Twin Shaft Mine in Pittston City, Pennsylvania results in a massive cave-in that kills 58 miners.