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 concept of self-driving cars, or autonomous vehicles, is being actively developed by companies such as Tesla, Google (Waymo), and Uber.

3) Insurance premiums are the payments made by policyholders to insurance companies in exchange for coverage.

4) The word "elephant" contains three vowels: E, A, and E.