1) The universe is estimated to be around 13.8 billion years old.

2) Oceans play a crucial role in regulating the Earth's climate by absorbing and storing large amounts of heat and carbon dioxide.

3) The Olympic Games, originating in ancient Greece, were revived in 1896 and are now held every four years, bringing together athletes from around the world.

4) The Berlin Conference in 1884-1885 divided Africa among European powers and set the stage for the colonization of the continent.