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

2) The banking industry is regulated by government agencies to ensure the stability and integrity of the financial system and to protect consumers.

3) The Earth's core is primarily composed of iron and nickel and is as hot as the surface of the sun.

4) The Russian Revolution in 1917 resulted in the overthrow of the monarchy and the establishment of a communist government under Vladimir Lenin.