1) The English alphabet has five vowels: A, E, I, O, and U.

2) The Great Barrier Reef, situated off the coast of Queensland, Australia, is the largest coral reef system in the world. It stretches over 2,300 kilometers (1,400 miles) and is home to a diverse array of marine life, making it a popular destination for diving and snorkeling.

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

4) The New York Stock Exchange (NYSE) is the largest stock exchange in the world.