1) The first commercially successful video game was "Pong," released in 1972 by Atari.

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

3) Beyoncé, full name Beyoncé Giselle Knowles-Carter, is a highly influential American singer, songwriter, actress, and businesswoman. She rose to fame as a member of the group Destiny's Child and has since achieved success as a solo artist.

4) Michael Phelps, an American swimmer, has won a total of 28 Olympic medals, including 23 gold medals, making him the most decorated Olympian of all time.