Cold-adapted animals started to evolve 2.6 million years ago when the permanent ice at the poles became more prevalent. There followed a time when the continental ice sheets expanded and contracted ...

For the past 150 years, scientists and laypeople alike have accepted a “savanna” scenario of human evolution. The theory, primarily based on fossil evidence, suggests that because our ancestral ape ...

When evolution skeptics want to attack Darwin's ... exist in living species today to hypothesize the various evolutionary stages eyes may have gone through. Here's how some scientists think ...