1) The sitcom "Friends" is known for its iconic Central Perk coffee shop, where the main characters often gather.

2) The word "telephone" contains five vowels: E, E, O, E, and E.

3) The United Nations Security Council is responsible for maintaining international peace and security, with five permanent members (China, France, Russia, the United Kingdom, and the United States) holding veto power over resolutions.

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