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Available for over a year

Percy Smith was the greatest pioneer of the natural history film-making - tackling subjects from flies to slime mould. During the 1920s in his principal studio, the back garden of his home in north London, he developed innovative microscope - and time-lapse photography which still looks impressive today. Tim Boon of London's Science Museum talks to historians and Sir David Attenborough. Producer: Tim Dee First broadcast on ÃÛÑ¿´«Ã½ Radio 4 in April 2009.