1) The Federal Reserve System, often referred to as the Fed, is the central banking system of the United States.

2) The longest-running TV show in history is "The Simpsons," which has been on the air since 1989 and has over 700 episodes.

3) The word "chocolate" contains four vowels: O, O, A, and E.

4) The world's largest volcano, Mauna Loa in Hawaii, is also one of the most active. It stands over 13,000 feet (4,000 meters) above sea level.