Four billion years ago, Earth was violent, hot, and unstable. Yet new research suggests that by then, life had already reached a surprising level of complexity. At that time lived the last universal ...

Where did it start? How did it grow complex? Why did it get big? Three moments in Earth’s early history when evolution ...

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 ...

Scientists probing life’s deepest origins have uncovered evidence that the first free-living cells may have emerged not once, but twice. The findings suggest a striking possibility: life may share one ...

University of Alberta geochemists have discovered a missing piece to one of the great mysteries of science—the origin of life on Earth. That fateful spark is believed to have occurred on the ocean's ...

Four billion years ago, Earth was covered in a watery sludge swarming with primordial molecules, gases, and minerals — nothing that biologists would recognize as alive. Then somehow, out of that ...

Add Yahoo as a preferred source to see more of our stories on Google. Life on Earth is thought to have emerged from the primordial ooze some four billion years ago. Now a provocative new study argues ...

Add Yahoo as a preferred source to see more of our stories on Google. RNA, which is one of life's most crucial molecules dealing with the synthesis of proteins, could be common in the universe, ...