Will dinosaurs ever roam the Earth again? They are our best-loved monsters. But could the discovery of their DNA be possible? Or could they one day be genetically engineered?
Jurassic giants emerge from US badlands
Glossary
Jurassic Mile - A one-square-mile of ground in the Big Horn Basin in Wyoming. Today it is hot and dry but during the Jurassic period it was wet and tropical. Flash floods killed and buried many dinosaurs leaving a rich deposit of remains.
Megalosaurus - William Buckland is not the only scientist who claimed to be the first to discover dinosaurs. Two years earlier, Gideon Mantell found Iguanodon teeth, but Buckland claimed they belonged to a fish.
Jurassic Park - Originally a novel by Michael Crichton, it was adapted for film by Steven Spielberg in 1993.
Amber - Fossilised resin - which is the viscous (thick, sticky) liquid inside a tree that protects it from external threats. Amber has been appreciated for its colour and natural beauty since Neolithic times.
De-extinction - Also known as resurrection biology. The woolly mammoth is the most likely candidate for resurrection and existed as recently as 4,000 years ago.
Dr Frankenstein - In Mary Shelley's 1818 novel, Frankenstein, Victor Frankenstein creates a living monster from dead body parts.