1) The sitcom "Friends" is known for its iconic Central Perk coffee shop, where the main characters often gather.

2) The first sound film, "The Jazz Singer," was released in 1927 and marked the transition from silent movies to "talkies."

3) The Eiffel Tower can be 15 cm taller during the summer due to thermal expansion.

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