PRESIDENTS' DAY SPECIAL: A look at leadership around the world

As the United States honors Presidents' Day, The World takes a close look at notable presidents and heads of state around the world, from South Africa's Nelson Mandela to Guatemala's Bernardo Arévalo. And, we hear about Honduras' first female president. Also, we learn more about North Korean leader Kim Jong-un's daughter, who may be next in line as the country's leader. Plus, an exploration of some of the world's oldest leaders.