1) 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.

2) The ancient city of Pompeii was preserved under layers of volcanic ash after the eruption of Mount Vesuvius in 79 AD, providing valuable insights into Roman life.

3) The word "book" contains two vowels: O and O.

4) The FIFA World Cup is the most-watched sporting event globally, with billions of viewers tuning in for the tournament held every four years.