I climb a silent hilltop, pausing to take in 360-degree views of the lonely green Arctic Coastal Plain. A spectral ptarmigan strutting through the fog is the only sign of life. Called Engigstciak ...

Rocks older than 4.03 billion years could shed light on Earth's earliest geological history, but they're incredibly rare. Reading time 2 minutes Due to the movement of Earth’s tectonic plates, our ...