1) 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.

2) The smallest unit of time is known as a zeptosecond, which is equal to one trillionth of one billionth of a second.

3) The Tony Awards celebrate excellence in Broadway theater and have been awarded annually since 1947.

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