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

2) 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.

3) Democracy is a system of government in which power is vested in the people, who exercise it through elected representatives. It allows for political participation, freedom of speech, and protection of individual rights and liberties.

4) Lightning strikes the Earth about 8 million times a day.