Evolution is always happening — so why can't we see it? A biologist explains the timescale problem, election pressure, and ...

Here’s what you’ll learn when you read this story: In the 1960s, Kimura’s neutral theory revolutionized molecular biology by arguing most DNA changes are random, not adaptive. A new study finds ...

(Diane Isabel/iStock/Getty Images) The world's population is shifting. We're living longer than ever before, with elderly ...

The theory of evolution by natural selection was first formulated in Darwin’s book “On the Origin of Species” in 1859. It ...

(Volodymyr Yakimchuk/Creatas Video+/Getty Images Plus) A seismic shift in the selection pressures acting on humans may have ...

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. A strange tiny species of crustacean has challenged the way we think ...

Natural selection is usually understood in the context of change. When organisms deviate from the norm, they may gain advantages that let their lineages outlast those of their less-adaptable relatives ...

Depending upon how you do the counting, there are around 9 million species on Earth, from the simplest single-celled organisms to humans. It’s reassuring to imagine that complex bodies and brains like ...