Mia Farrow, actor and UNICEF ambassador, has just returned from a trip to Chad and the Central African Republic, two of Africa's most forgotten and troubled nations. Now she shares what she saw there and encourages the world to take action. Also: why people fight for sport - and why others like to watch. We'll hear about a revival of a little-known play by JM Barrie, author of Peter Pan. And a conversation with two women who are being honored for their remarkable scientific achievements.