"Everyone has the right to education." This phrase is part of the Universal Declaration of Human Rights. It refers to education in all countries, for girls and boys as well for all adults. In Perspective, we spoke to David Atchoarena, head of UNESCO's Institute for Lifelong Learning. He told us why adult education is not just a right, but also essential to tackling the world's social, economic and environmental uncertainty. He also explained why some groups, such as migrants and prisoners, are still struggling to access education.