2016 was the Arctic's warmest year on record 'by far'
December 22, 2016, 1:07 p.m. by Russell McLendon
The heat may lead to record-low sea ice in 2017, scientists warn, which could let the Arctic warm up even more.
Killer whales vs. shark: Drone footage shows rare attack
December 18, 2016, 2:52 p.m. by Bryan Nelson
Video settles who is truly atop the ocean food chain.
The Earth's mountains, rocks and water bodies are ancient. Do you know how old they are?
December 16, 2016, 12:43 p.m. by Angela Nelson
The Earth's mountains, rivers, animals and rocks have been around for millions or billions of years. Do you know which ones have been around the longest?