Imagine the tree of life. The tip of every branch represents one species, and if you follow any two branches back through time, you'll hit an... Life as we know it descended from a single cell. What ...

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Something written in every biology textbook of the past 70 years may need a rewrite. Not because the science was careless, or ...

All life on Earth can be traced back to a Last Universal Common Ancestor, or LUCA. A new study suggests that this organism likely lived on Earth only 400 million years after its formation. Further ...

It may be hard to imagine complicated life forms on early Earth. Oxygen was low and asteroids may have been pelting the baby planet’s surface. Despite those harsh conditions, a microbe may have ...