1) Bats are the only mammals capable of sustained flight.

2) The Great Barrier Reef in Australia is the largest living structure on Earth and can be seen from space.

3) The Nile River, spanning approximately 6,650 kilometers (4,130 miles), is the longest river in the world. It flows through eleven countries in northeastern Africa, supporting various civilizations throughout history and serving as a vital source of water and transportation.

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