1) The process of impeachment involves charging a public official, such as a president or high-ranking government official, with misconduct and potentially removing them from office through a trial and vote by the legislature.

2) The musical "The Phantom of the Opera" has been running in London's West End since 1986, making it the longest-running musical in history.

3) The fall of the Berlin Wall in 1989 symbolized the end of the Cold War and the reunification of East and West Germany.

4) The paella is a traditional Spanish rice dish that originated in the Valencia region. It is typically cooked in a wide, shallow pan and combines rice with various ingredients, such as saffron, vegetables, meat (like chicken or rabbit), seafood, and spices. Paella is known for its vibrant colors, aromatic flavors, and communal dining experience, often enjoyed during festive occasions and social gatherings.