Ancient enzymes show life’s nitrogen signal stayed unchanged for billions of years, helping scientists read early Earth.

A bizarre fossil called Prototaxites, which was the largest life-form on land 400 million years ago, may have been a ...

In a new, yet-to-be-peer-reviewed paper, scientists from the University of Edinburgh in Scotland argue that the massive and mysterious tubelike fossils known as “prototaxites” deserve their own life ...

Hundreds of millions of years before dinosaurs, the tallest things on land were not trees or animals but towering, trunk-like ...

The Great Oxygenation Event marked a massive transition in life on Earth, when oxygen became plentiful and organisms suddenly had to adapt. Current conditions in Japanese hot springs give clues as to ...

How did life begin on Earth? While scientists have theories, they don't yet fully understand the precise chemical steps that led to biology, or when the first primitive life forms appeared. But what ...

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 ...

How did life begin on Earth? While scientists have theories, they don’t yet fully understand the precise chemical steps that led to biology, or when the first primitive life forms appeared. But what ...

All species alive today, from chimpanzees to bacteria, are cousins that each have equally long lineages, rather than ...