1) The world's oldest living plant is believed to be a clonal shrub called "Old Tjikko" in Sweden, estimated to be over 9,500 years old.

2) 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.

3) The world's most expensive car is the Bugatti La Voiture Noire, which sold for over $18 million.

4) The musical "The Phantom of the Opera" has been running in London's West End since 1986, making it the longest-running musical in history.