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A scene from 2009 blockbuster <i>Avatar</i>.

Why intelligent aliens might look like us

If aliens exist, would they look similar to use or take a form beyond our wildest imaginings? The answer depends on how we think evolution works at the deepest level.

We've been wrong about the origins of life

Primordial soup made sense when little was known about the universal principles of life's energetics, but it's time to ...

For nearly nine decades, science’s favorite explanation for the origin of life has been the 'primordial soup'. Recent research points to a different story.

The lingering embers of discovering fire

How did the harmful effects of fire shape our evolution?

Figuring out how to make fire was no doubt an evolutionary boon to our ancestors. But it may have led to our smoking habit and the emergence of tuberculosis.