1) The oldest known musical instrument is a flute made from a bird bone, estimated to be around 43,000 years old.

2) The speed of a sneeze can reach up to 100 miles per hour (160 kilometers per hour).

3) The world's tallest waterfall is Angel Falls in Venezuela, with a height of about 3,212 feet (979 meters).

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.