Quiz: How Much Do You Know About Presidential Food?

A mongoose is lightning fast and has razor-sharp teeth. A black mamba can kill 15 grown men with just one bite. Which of these two mortal enemies will win?

A Mongoose and Black Mamba Fight to Death (2:33)

It's no secret that Charles IV, king of Bohemia, possessed the Spear of Destiny. But the way he brandished it in public reveals his savvy understanding of mythology and power.

Unlocking the Spear of Destiny's True Power (3:56)

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)

In 1992, Christopher McCandless set off to test if he could survive alone in the wilds of Alaska. It didn't go as planned.

What Happened to Chris McCandless? (3:38)