For a long time, most scientists believed that early human hunter-gatherer societies were mostly equal, with little hierarchy ...

New research led by a University of Oregon ecologist suggests that fire was historically more frequent in the Douglas fir ...

Before plants evolved, vegetative life consisted of primitive green algae living in the sea. Like plants, these algae survived by performing photosynthesis, turning sunlight into energy. However, ...

Exploring Earth's deep interior is a far bigger challenge than exploring the solar system. While we have traveled 25 billion km into space, the deepest we have ever gone below our feet is just over 12 ...