1) 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.

2) The strongest natural material known to man is spider silk. It is stronger than steel and more flexible than nylon.

3) The first successful human heart transplant was performed by Dr. Christiaan Barnard in 1967.

4) Oprah Winfrey is an American media mogul, television host, actress, and philanthropist. She is best known for hosting "The Oprah Winfrey Show," which became the highest-rated talk show in TV history, and for her influential role in the entertainment industry.