Did you know that Croatia has a natural wonder called the Eye of the Earth? This epic source of the Cetina River earned its nickname because it truly resembles a stunning blue eye. However, this is ...

Earth was not always the blue-green world we know today: early Earth's oxygen levels were about a million times lower than we now experience. There were no forests and no animals. For ancient ...

Forbes contributors publish independent expert analyses and insights. I write about biodiversity and the hidden quirks of the natural world. We’ve pieced together a remarkably detailed timeline of ...