Photo of the Week: Theyyam Temple Performance

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)

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)

Why saying cheese just didnt happen in the early days of photography.

Ask Smithsonian: Why Don’t People Smile in Old Photographs? (1:12)

In this exclusive clip from the 1930s, Confederate veterans step up to the mic and let out their version of the fearsome rallying cry

What Did the Rebel Yell Sound Like? (4:22)