Universal Crossword Puzzle

There aren't many rumors that American socialite Wallis Simpson hasn't been subjected to. So here's how she actually infiltrated the British monarchy.

How Wallis Simpson Infiltrated British Royalty (4:18)

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

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

Green tree vipers can kill in the dark. With special heat-sensing abilities, they can find prey that's all but invisible.

A Pit Viper's Sixth Sense (2:03)

Eric Green, director of the National Human Genome Research Institute, explains how genomics are revolutionizing medicine at Smithsonian's "The Future is Here" event

The Human Genome: Unlocking Life's Code (15:37)