<p>Sir David Butler pioneered the science of elections, transforming the way we analyse election results. In 1945, aged only twenty, Butler was the first to turn British constituency results into percentages, and thereby founded the science of psephology. Appearing as an expert on Britain's first TV election night in 1950, he promoted the idea of 'swing' to explain gains and losses to the public. Later, he invented the BBC's popular Swingometer, ...