1) The world's largest flower is the Rafflesia arnoldii, which can grow up to 3 feet (1 meter) in diameter and weighs about 15 pounds (7 kilograms).

2) A group of flamingos is called a "flamboyance."

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

4) The Renaissance period, which began in Italy in the 14th century, marked a renewed interest in art, literature, science, and philosophy.