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

2) 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.

3) The human body contains enough carbon to make over 9,000 pencils.

4) The speed of a sneeze can reach up to 100 miles per hour (160 kilometers per hour).