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 Boston Celtics and the Los Angeles Lakers are the most successful teams in NBA history, with a combined total of 33 championships.

3) The first modern health insurance policy was introduced in Germany in the late 19th century.

4) The Southern Ocean surrounds Antarctica and is the coldest and least-visited ocean.