Last week, when my teenage daughter came back from school, she proudly showed me her newly bought t-shirt. This t-shirt had an intriguing slogan: "The invisible children."

After asking her few questions and to my incredulous look, she told me the following: "An organisation from the U.S. came to our school and spoke to us about child soldiers in Congo and other African countries. This organisation is on a school tour in North America. It sells crafts and other items in order to help raise money that will be used to award these kids scholarships... Isn't that great?" She was very enthusiastic.