1) The most-watched television event in the United States is the Super Bowl, with millions of viewers tuning in each year.

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

3) The Great Lakes, consisting of Lake Superior, Lake Michigan, Lake Huron, Lake Erie, and Lake Ontario, form the largest group of freshwater lakes on Earth by total area. They are shared by the United States and Canada and are of significant ecological and economic importance.

4) The development of the microprocessor by Intel in 1971 paved the way for the modern computer and led to the exponential growth of computing power.