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Season 2009, Episode 1117 - "How Long is a Piece of String?"

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17 November, 2009

Alan Davies attempts to answer the proverbial question: how long is a piece of string? But what appears to be a simple task soon turns into a mind-bending voyage of discovery where nothing is as it seems. An encounter with leading mathematician Marcus du Sautoy reveals that Alan's short length of string may in fact be infinitely long. When Alan attempts to measure his string at the atomic scale, events take an even stranger turn. Not only do objects appear in many places at once, but reality itself seems to be an illusion. Ultimately, Alan finds that measuring his piece of string could - in theory at least - create a black hole, bringing about the end of the world.

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  • Dilly Barlow as
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  • Jack Fortune as
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BBC: Horizon Wiki

Premiere: 1964

Type: TV Show

Genres/Tags: Science, Philosophy, Documentary

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Horizon is a current and long-running BBC popular science and philosophy documentary programme. The programme was first broadcast in 1964 with "The World of Buckminster Fuller" which explored the theories and structures of inventor Richard Buckminster Fuller and included the Horizon mission statement, "The aim of Horizon is to provide a platform from which some of the world's greatest scientists and philosophers can communicate their curiosity, observations and reflections, and infuse into our common knowledge their changing views of the universe". There have been over 1000 episodes made and broadcast.

Horizon has investigated an eclectic mix of subjects and controversial topics such as 'Does the MMR jab cause autism?'; opened the awareness of consumers to the use of whale meat in pet food in 1972; and produced award-winning documentary-dramas such as 'Life Story' in 1987 which dramatised the discovery of the structure of DNA.