1) The Battle of Waterloo in 1815 marked the final defeat of Napoleon Bonaparte and the end of his reign as Emperor of France.

2) The concept of gravity was famously described by Sir Isaac Newton after an apple fell on his head.

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

4) 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.