Did you know that one in six children worldwide are engaged in child labor? And it goes beyond children working in factories. They are even working in the sex industries or warfare.

Professor of Labor and Human Resources at ASU, Hugh Hindman, is editor of the book, "The world of child labor, an historical and regional survey." This book features over 200 essays from scholars and activists around the world.

Researching this topic, according to Hindman, was an eye opener. Although child labor is not as prevalent in the US, it is still a problem, such as children working in US agriculture industries for long hours.