Almost a decade after its extinction, the Pyrenean ibex became newly un-extinct thanks to cloning. But what are the limits of this technology? Could we one day visit a real-life Jurassic Park? Bring back the king by Helen Pilcher recounts the progress that has been made in the field of de-extinction and what benefits it may bring. Hear an interview with Pilcher, an extract from the book and the views of the Chemistry World team.