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

2) The world's longest traffic jam occurred in China in 2010 and lasted for 12 days, stretching over 60 miles (97 km).

3) Insurance premiums are the payments made by policyholders to insurance companies in exchange for coverage.

4) The United States operates under a two-party system, with the Democratic Party and the Republican Party being the two major political parties that compete in elections and shape the country's political landscape.