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Countryfile looks at the part the landscape has played in making scientific breakthroughs, and the way in which such breakthroughs have changed our understanding of the land we live in. John Craven heads to Wytham Woods, Oxford University's 'laboratory with leaves' . It is 70 years since Charles Elton first made scientific observations in these woods; John walks in his footsteps to find out how Elton's work still plays a part in shaping our ideas of the world, and meets the scientists carrying his work forward. John also looks back at the best of Countryfile's forays into the world of science, including Matt Baker's look at the pioneer of natural history; Gilbert White and Julia Bradbury's trip to the coast to uncover the story of the palaeontologist and fossil collector, Mary Anning; the time when Adam learned how Hollywood wizardry is helping scientists breed the perfect pig; and when Tom Heap found out how robotics could transform farming in the future.