1) The Great Barrier Reef in Australia is the largest coral reef system in the world and is visible from space.

2) The oldest known musical instrument is a flute made from a bird bone, estimated to be around 43,000 years old.

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

4) The Rocky Mountains, also known as the Rockies, extend from Canada through the United States, offering stunning landscapes and outdoor recreational opportunities.