Charles Darwin worried that the fossil record looked strangely abrupt, with complex animals appearing in a geological instant ...

During these waves of mass extinction, most vertebrate survivors were confined to refugia, or isolated biodiversity hotspots ...

The oldest fossilized remains of complex animals appear suddenly in the fossil record, and as if from nowhere, in rocks that ...

These radioactive elements decay at known rates, effectively acting as a built-in clock that reveals precisely when the eggs were buried millions of years ago. This natural timekeeping mechanism has ...