For major social change, you have to educate and motivate communities to act differently. One Senegalese chief achieved just that. The NGO he worked with shares the lessons learned
Emma G Keller: Lauren Kessler spent a year investigating the ageing process and what – if anything – we can do to prevent it. She'll take your questions live today at 1pm ET
Deborah Orr: The angry arguments against David Cameron's opt-in filter proposals seem to imply that it's normal to want access to porn, and abnormal not to want access to porn