1) The tongue of a blue whale is so big that about 50 people could stand on it.

2) The World Wide Web, developed by Tim Berners-Lee in 1989, revolutionized the way information is accessed and shared on the internet.

3) The Southern Ocean surrounds Antarctica and is the coldest and least-visited ocean.

4) The Appalachian Mountains, running along the eastern coast of the United States, are one of the oldest mountain ranges in the world.