general_fact: 401 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 401 is the number of connected planar Eulerian graphs with 9 vertices.
trivia: 401 is an unremarkable number.
historical_date: February 4th is the day in 1996 that Major snowstorm paralyzes Midwestern United States, Milwaukee, Wisconsin ties all-time record low temperature at -26°F (-32.2°C).