Although stone walls have been around since the Stone Age, they have not been improved on in terms of beauty and utility.

Bright colours in the wild usually mean one thing– danger. And for some frogs, those colours are their way of warning others ...

How Amazon forest loss may affect water—and climate—far away. A surge in deforestation under Brazil's president could "tip" the Amazon, affecting weather and water supplies—in Brazil and beyond.

There are many diseases that mosquitoes can transmit, but HIV isn't one of them. Here's why, and what viruses you do need to watch out for depending on where you live.