Monday marks the 93rd birthday of Nelson Mandela. The United Nations today marked the second annual Nelson Mandela International Day with a series of public service events, exhibitions and film screenings in recognition of the former South African president’s contributions as a human rights defender, freedom fighter and peacemaker. The Nelson Mandela Foundation decided last year to ask well-wishers and gift-givers from around the world not to send gifts, but instead, to take action in their local communities and do something to help someone in need, so that the world is changed for the better.