1) The speed of a sneeze can reach up to 100 miles per hour (160 kilometers per hour).

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

3) The Sahara Desert, located in North Africa, is the largest hot desert in the world, covering an area of about 9.2 million square kilometers (3.6 million square miles). It is characterized by vast stretches of sand dunes, rocky plateaus, and extreme temperatures.

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