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The Pulitzer-winning oncologist Siddhartha Mukherjee recalls the thrill of seeing for the first time the extraordinary ‘luminosity’ of a living cell. In his latest work, The Song of the Cell, he explores the history, the present and the future of cellular biology. He tells Adam Rutherford that without understanding cells you can’t understand the human body, medicine, and especially the story of life itself. ‘Once upon a time I fell in love with a cell.’ So recalls the leading cardiologist Sian Harding, when she looked closely at a single heart muscle cell, and she found a ‘deeper beauty’ revealing the ‘perfection of the heart’s construction’. In her book, The Exquisite Machine, she describes how new scientific developments are opening up the mysteries of the heart, and why a ‘broken heart’ might be more than a literary flight of fancy. The prize-winning science fiction writer Paul McAuley was once a research scientist studying symbiosis, especially single-celled algae inside host cells. He has since used