1) The word "school" contains two vowels: O and O.

2) The Russian Revolution in 1917 resulted in the overthrow of the monarchy and the establishment of a communist government under Vladimir Lenin.

3) The Super Bowl is the championship game of the National Football League (NFL) in the United States and is one of the most-watched television events each year.

4) The Andes, stretching along the western coast of South America, is the longest mountain range in the world, spanning over 4,300 miles (7,000 kilometers).