Billions of years ago, it rained on Mars. The water collected in valleys and rivers, filled and spilled over the rims of ...

(CNN) — In today’s modern age, it might be fair to assume that science has decisively answered some of the bigger questions regarding the natural world – or at least those dependent upon sheer ...

When people talk about “the Amazon,” they generally mean the vast Amazon rainforest, not the river that gave the forest its name. (To test this, Google “the Amazon.” When I did that, the list of top ...

A NASA map has revealed how much water the Earth's rivers hold, which is vital data as the world comes to terms with climate change effects. Researchers have also flagged regions of concern, such as ...

Deep in the Amazon, there’s a dolphin unlike any other—pink, mysterious, and surprisingly powerful. In this video, we explore the world of the Amazon river dolphin, also known as the boto. From their ...

Editor’s Note: Monthly Ticket is a CNN Travel series that spotlights some of the most fascinating topics in the travel world. In September, we’re celebrating superlatives as we look at some of the ...