1) The world's first stock exchange was established in Amsterdam in 1602.

2) The speed of light is approximately 299,792,458 meters per second.

3) The "Star Wars" franchise, created by George Lucas, has become a global phenomenon with numerous films, TV shows, books, and merchandise.

4) The Mongol Empire, under the leadership of Genghis Khan, became the largest contiguous empire in history, spanning from Asia to Europe.