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

2) George Clooney is an American actor, filmmaker, and activist. He gained fame for his role in the television series "ER" and has since starred in successful films such as the "Ocean's" trilogy, "Syriana," and "Up in the Air," winning several awards for his performances.

3) The Dow Jones Industrial Average (DJIA) is a stock market index that tracks the performance of 30 large, publicly owned companies in the United States.

4) The windshield wipers were invented by a woman named Mary Anderson in 1903.