Edi Stark talks to folk singer Karine Polwart, a former philosophy teacher and social worker, in a series exploring artists who challenge our ethical and moral views.

Edi Stark talks to Hazel McHaffie, a medical researcher who became a novelist to increase public understanding of the ethical dilemmas created by advances in medicine.

Edi Stark meets photographer Tim Hetherington, who won the 2007 World Press Photo Award for his picture of an exhausted US soldier in Afghanistan.