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Life is all around us, abundant and diverse. It is truly a marvel. But what does it actually mean to be alive, and how do we decide what is living and what is not?

About the Author

Sir Paul Nurse is a geneticist and cell biologist whose discoveries have helped to explain how the cell controls its cycle of growth and division. His contributions to cell biology and cancer research were recognised with a knighthood in 1999, and his endeavours relating to the discovery of cell cycle regulatory molecules saw him jointly awarded the Nobel Prize for Physiology or Medicine in 2001. Since 2011, he has been the director and chief executive of the Francis Crick Institute.