general_fact: 778 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 778 is the number of ways a 5×1 rectangle can be surrounded by 5×1 rectangles.
trivia: 778 is an uninteresting number.
historical_date: February 16th is the day in 116 that Emperor Trajan sends laureatae to the Roman Senate at Rome on account of his victories and being conqueror of Parthia.