1) The world's tallest waterfall is Angel Falls in Venezuela, with a height of about 3,212 feet (979 meters).

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

3) Cyclones, also known as hurricanes or typhoons, are powerful tropical storms characterized by low-pressure centers and strong winds.

4) The ancient city of Rome was founded in 753 BC and went on to become one of the most powerful and influential civilizations in history.