Leatherback sea turtles eat by swallowing water along with their prey, then vomiting up the water while the spikes in their mouths prevent the prey from escaping.

Joseph Nicéphore Niépce took the first photo ever, "View from the Window at Le Gras," from his estate in France in 1826 or 1827 using a technique he'd invented called heliography and a camera obscura.

In 2016, the famous nun Mother Teresa was declared a saint by Pope Francis — but many people say she doesn't deserve it.

Here's a look at what's expected to be when the JFK assassination records are released.

His words will live on forever.

After years of legal wrangling, justice may finally be served.

Donald Trump has invigorated the idea of the border wall. Historically, he isn't alone.

What one small city in Belgium can teach the world about mental illness.

Although the lives of the greatest American spies are always kept secret, it's the lives of the notorious double agents that capture the public's attention.

How a civilian engineer became a World War II spy -- twice -- and stopped the Duquesne spy ring that had infiltrated America's borders.

Civilization started because of agriculture -- that much is known. But what if agriculture started because of beer?