general_fact: 6828 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 6828 is the number of ways to start with a knight in the corner of an 8×8 chessboard, make 8 moves, and end on the same square.
trivia: 6828 is an uninteresting number.
historical_date: September 10th is the day in 2008 that the Large Hadron Collider at CERN, described as the biggest scientific experiment in history is powered up in Geneva, Switzerland.