North America is the third largest continent in the world. It is located in the Northern Hemisphere. The north of the continent is within the Arctic Circle and the Tropic of Cancer passes through ...

In ancient China, spring rains were called "as precious as oil" for their vital role in nature's spring revival. Today, a ...

(CNN) — Around 34 million years ago, the ancestors of modern iguanas likely embarked on what may be the longest overwater journey undertaken by a nonhuman, land-dwelling vertebrate species.