The Map That Changed the World

Hidden behind velvet curtains above a stairway in a house in London's Piccadilly is an enormous and beautiful hand-coloured map - the first geological map of anywhere in the world. Its maker was a farmer's son named William Smith. Born in 1769 his life was troubled: he was imprisoned for debt, turned out of his home, his work was plagiarised, his wife went insane and the scientific establishment shunned him.