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 intensity of cyclones is often measured using the Saffir-Simpson Hurricane Wind Scale, which categorizes them based on their sustained wind speeds.

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

4) The word "telephone" contains five vowels: E, E, O, E, and E.