general_fact: 538 is the total number of votes in the Electoral College of the United States.
math_fact: 538 is the 10^{th} open meandric number.
trivia: 538 is the total number of votes in the Electoral College of the United States.
historical_date: June 21st is the day in 1919 that the Royal Canadian Mounted Police fire a volley into a crowd of unemployed war veterans, killing two, during the Winnipeg General Strike.