Petrified wood is one of the most sought-after materials in the world for both its aesthetic value and its scientific value.

The story of how humans evolved is a long and winding one — and it grows more complicated with each passing year.

The Frozen Ground Under Threat Permafrost is like Earth's ancient freezer, stretching over vast regions, mainly near the ...

Waking up cold. Freezing while sitting for any length of time as the circulation slows.