Ice caves are without a doubt some of the strangest natural wonders on Earth.
10 national animals that are rare, unusual, endangered or completely nonexistent
November 30, 2015, 7:32 a.m. by Matt Hickman
Why shouldn't a unicorn hold such a lofty national position?
An intimate look at Yellowstone's most famous grizzly mama
November 30, 2015, 6:32 a.m. by Jaymi Heimbuch
Explore the life of bear 399 and her cubs through the images of Tom Mangelsen.
Human betrayal drove rapid spread of our species around the world
November 30, 2015, 2:42 a.m. by Bryan Nelson
The history of human migration might have played out like an epic Greek tragedy, driven by betrayal, lies and broken trust.
King Tut's tomb likely has hidden, undiscovered rooms
November 29, 2015, 1:14 a.m. by Bryan Nelson
Researchers say there's a 90% chance of more undiscovered chambers amid new evidence.
What is this weird purple slime that is clotting Norway's fjords?
November 26, 2015, 4:22 a.m. by Bryan Nelson
Mystery still surrounds exactly what the purple goo is, and scientists say it's a phenomenon they've never seen before.