Toxicology, more about life on Mars and children's author Philip Ardagh

We meet children’s author Philip Ardagh for a chat; find out more about Mars and discovering life on Earth in some of the most unlikely places; and we catch up with an Open University graduateto learn about toxicology. The interviews are recorded by OU staff and the programme is hosted by Dr Mike Bullivant from the OU/BBC television series Rough Science.