Photo of the Week: A Quick Nap, Myanmar

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)

A hammerhead shark locates a stingray hiding beneath the ocean floor. Unnerved, the stingray makes a dash for freedom but is it too late?

Hammerhead vs. Stingray (2:25)

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)

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

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