general_fact: 388 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
math_fact: 388 is the maximum value of n so that there exist 6 denominations of stamps so that every postage from 1 to n can be paid for with at most 6 stamps.
trivia: 388 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
historical_date: January 22nd is the day in 1905 that Bloody Sunday in St. Petersburg, beginning of the 1905 revolution.