For this instalment in the Everything you ever wanted to know about... series, we’ve sourced questions from Google, our listeners and the Science Focus team to put to experts and help you understand key ideas in science, in short episodes.

This week, we're joined by geneticist Sir Paul Nurse, the Director of the Francis Crick Institute in London and one of the recipients of the 2001 Nobel Prize in Physiology or Medicine, which he shared with Leland Hartwell and Timothy Hunt.

Paul has recently published a book that helps readers understand biology, called What is Life? (£9.99, David Fickling Books). He shared some of the concepts from the books with us over two quick-fire episodes.

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