Why did humans evolve the eyes we have today? While scientists can't go back in time to study the environmental pressures ...

Humans have it. So does Drosophila. But not yeast. That "it" is a small pause at the start of gene activity—a brief molecular halt that may have helped life evolve from simple cells to complex animals ...

Tiny genetic variations between humans, Neanderthals and Denisovans might not be all they were cracked up to be.

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