How vast is our planet? The answer may lie in how we perceive it. On the grand cosmic scale, the earth is minuscule, a mere speck invisible even under the most powerful microscope. However, on a human scale, it is truly enormous. 

Humans were in the Arctic at least 45,000 years ago, revealed a new study that describes a brutal mammoth hunting by humans from that time.

Russian scientists display the remains of two ancient cave lion cubs that were found preserved in permafrost. The cave lion species became extinct some 12,000 years ago.