1) The most-watched television event in the United States is the Super Bowl, with millions of viewers tuning in each year.

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

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

4) The word "computer" contains three vowels: O, U, and E.