For the final instalment of this series we are turning over the programme to you, our listeners. Over the past four months we’ve asked you to send us your questions, and you have obliged. But we haven’t always managed to reciprocate by answering them. In this episode, Tim Harford talks with a panel of experts who will try to answer as many questions as we can fit into a half an hour. Guests include Professor Beate Kampmann from the London School of Hygiene and Tropical Medicine, Professor Melinda Mills of Oxford University, and the GP Dr Helen Salisbury.