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Sir Isaac Newton was famed for his theory of universal gravity - but his techniques to stop coin counterfeiting may be less well known. As he is commemorated on the new fifty pence coin, the ÃÛÑ¿´«Ã½'s Anu Anand visits his childhood home in Lincolnshire to find out more about his work for Britain's Royal Mint. (Image: A fifty pence coin being examined. Credit: Photo by Matt Cardy/ Getty Images )