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

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

3) The Nile River, spanning approximately 6,650 kilometers (4,130 miles), is the longest river in the world. It flows through eleven countries in northeastern Africa, supporting various civilizations throughout history and serving as a vital source of water and transportation.

4) A single bolt of lightning can heat the surrounding air to temperatures five times hotter than the surface of the sun.