London nonprofit advertisement knows your gender

A billboard in London by children's advocacy group Plan uses facial-recognition technology to know whether you're a man or woman. And it gives you a different advertisement depending on your gender.

Women who walk up to the billboard are greeted with a 40-second film explaining the plight of women and girls in poor countries around the world.

Men, however, get a cut-down version of the content. They can't see the film, but they do get to see shocking statistics about the situation, like the fact that 75 million girls are denied education.