How a molar, jawbone, and pinkie are rewriting human history

Stunning discoveries and fresh breakthroughs in DNA analysis are changing our understanding of our own evolution and offering a new picture of the "other humans" that our ancestors met across Europe and Asia.

What made these 1,300 strange circles at the bottom of the sea?

When hundreds of eerily perfect circles were discovered on the bottom of the Mediterranean Sea, theories abounded about what they could mean. Four years of underwater research revealed a lost world.

Uncovering the secrets of a covert U.S. nuclear base in Greenland

It was a secret nuclear-powered city built deep within a glacier. Its true legacy is only now being revealed.

Step inside the nuclear-powered city the U.S. hid inside a glacier

During the Cold War, the U.S. built a nuclear-powered underground military facility under the ice. Archival video shows us how it was pulled off—and why it could never last.

These ants are saving our forests—by spraying acid everywhere

The engineering and defensive skills of red wood ants help the endangered species transcend its small stature in the natural world.

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