Most Populous U.S. Cities

A giant killer hornet war is waged between two colonies, and the resources, territories, and survival of a new generation are at stake. Watch the battle unfold as these huge hornets risk their lives for their kingdoms.

Two Giant Killer Hornet Colonies Battle to the Death (3:25)

Coconut octopuses are among the most intelligent invertebrates around: They use tools, carry their shelters around for when they need them, and, fittingly, adopt an underwater walking motion that's very similar to humans.

A Coconut Octopus Uses Tools to Snatch a Crab (2:34)

Thousands of massive stone monuments, known as Moai, preside over Easter Island. The way they were carved, using only stone tools, seems unfathomable.

How Were Easter Island's Gigantic Statues Actually Carved? (4:11)

Da Vinci's The Last Supper plays a key role in the 2006 blockbuster hit The Da Vinci Code. Although the film's claims are more fiction than fact, could the painting actually contain a message from Leonardo?

Does 'The Last Supper' Really Have a Hidden Meaning? (4:03)