Born a slave in Maryland, Harriet Tubman knew first-hand what it meant to be someone's property; she was whipped by owners and almost killed by an overseer. It was from other field hands that she first heard about the Underground Railroad, which she travelled by herself north to Philadelphia. Throughout her long life, and long after the Civil War brought an end to slavery, this amazing woman was proof of what just one person can do.

As a child he dreamt of changing South Africa; as a man he changed the world. Nelson Mandela spent his life battling apartheid and championing a peaceful revolution. He spent twenty-seven years in prison and emerged as the inspiring leader of the new South Africa. He became the country's first black president and went on to live his dream of change.