1) The Great Wall of China is not visible from space without aid, contrary to popular belief.

2) The Pacific Ocean is the largest ocean on Earth, covering more than 30% of the planet's surface.

3) 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.

4) The ancient city of Rome was founded in 753 BC and went on to become one of the most powerful and influential civilizations in history.