Nobel Prize-winning scientist Sir Paul Nurse sits down with Amy to explore and answer the question, What Is Life? This is considered in Paul's recent book, What Is Life? Understand biology in five steps. Paul is director and CEO of the Francis Crick Institute in London. His contributions to cell biology and cancer research were recognised with a knighthood in 1999, and his discovery of cell cycle regulatory molecules saw him jointly awarded the Nobel Prize for Physiology or Medicine in 2001.