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

2) The word "elephant" contains three vowels: E, A, and E.

3) The Age of Exploration, during the 15th and 16th centuries, saw European explorers such as Christopher Columbus and Vasco da Gama reach new lands and establish trade routes.

4) The global push for COVID-19 vaccination campaigns has been a significant focus, with the development and distribution of vaccines to combat the spread of the virus and protect public health.