When most people think about Earth, they think about land. You’ve probably spent your entire life on land. If you look at a globe, however, you can see that there is not as much land as water. Most of the Earth is covered by water, and most of that water is salty. Almost all of the salt water is connected into one huge ocean. The ocean covers almost two-thirds of the Earth.

Other waterfalls are higher than Niagara Falls, but Niagara Falls is one of the most famous. Why? Because the great beauty and immense size of Niagara Falls make it one of North America’s most spectacular natural wonders!

Learn about the Bermuda Triangle, Atlantis and other mysteries in Great Mysteries Series, a new series from English Plus Podcast. A new series that will fire up your imagination and lead you to think about some unanswered questions in science, people, history, religion, myth and more.

If a pig weighed as much as a pickup truck it might look something like a river hippopotamus. A hippopotamus, or hippo, is an animal that lives in Africa. Like a pig, it has a tubby body, big head, and short, thick neck. In fact, the hippopotamus is a distant relative of the pig.

Brave, bold, and brutally successful—he was known as Charlemagne (Charles the Great). Charlemagne is remembered as one of history’s great leaders. This warrior king succeeded in building an empire that united much of Europe.

As a boy, Jean Chrétien was often picked on. A childhood illness left his face partially paralyzed. It also made him deaf in one ear. When he was teased about these things, he would fight back, and sometimes get in trouble.

Imagine you are snorkeling in the warm ocean water around a tropical coral reef. You put on your mask and swim fins. You float around looking at the reef below you. The coral reef looks like strangely shaped rocks sticking up from the ocean floor. Crooked coral that looks like tree limbs twists up from cracks and caves in the reef

Grand tombs and gateways to the afterlife—the pyramids of Egypt are among the world’s most magnificent monuments. Their massive size and simple shape fascinate people.