David Attenborough turns his life-long fascination with amber into a time-travelling detective story that spans 150 million years. In the time of the dinosaurs, some trees produced a noxious resin to protect themselves from voracious jaws, and this resin embalmed everything it touched in exquisite detail. Today, this substance and its contents endure in the form of amber. Natural World explores the amazing contribution this material has made to our understanding of the past, and the potential benefits it has for our future.