General fact: 911 is the number of days after September 11th that the Madrid Attack took place.
Mathematical fact: 911 is the American emergency number.
Trivia: 911 is the number of days after September 11th that the Madrid Attack took place.
Historical date: June 29th is the day in 1956 that the Federal-Aid Highway Act of 1956 is signed, officially creating the United States Interstate Highway System.