Everybody knows Bill Gates and Melinda Gates. They are not only a famous couple. He is very well known for to have created the most used computer operative system in the world but, this couple, it is in fact, one of the biggest philanthropic matrimony of the world. Thanks to the Gates Foundation a lot of people have seen an improvement in their lives. Now, they have created a new campaign called Gates Letters. Please, watch the video bellow to know more.