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

2) The word "mountain" contains three vowels: O, U, and A.

3) 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.

4) The role of the judiciary is to interpret laws, resolve disputes, and ensure justice in accordance with legal principles and the constitution. It serves as a check on the executive and legislative branches of government.