Season 2009, Episode 1117 - "How Long is a Piece of String?"
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.
BBC: Horizon Full Episodes
- Season 2009
- Episode 1117 - How Long is a Piece of String? view all resultsWatch BBC: Horizon Season 2009, Episode 1117 - How Long is a Piece of String? Online Add To Playlist Watched
- Episode 1103 - Who's Afraid Of A Big Black Hole view all resultsWatch BBC: Horizon Season 2009, Episode 1103 - Who's Afraid Of A Big Black Hole Online Add To Playlist Watched
- Episode 1027 - Fix Me view all resultsWatch BBC: Horizon Season 2009, Episode 1027 - Fix Me Online Add To Playlist Watched
- Episode 1020 - The Secret You view all resultsWatch BBC: Horizon Season 2009, Episode 1020 - The Secret You Online Add To Playlist Watched
- Episode 1013 - Do I Drink Too Much? view all resultsWatch BBC: Horizon Season 2009, Episode 1013 - Do I Drink Too Much? Online Add To Playlist Watched
- Episode 512 - How Violent Are You? view all resultsWatch BBC: Horizon Season 2009, Episode 512 - How Violent Are You? Online Add To Playlist Watched
- Episode 331 - Alan and Marcus Go Forth and Multiply view all resultsWatch BBC: Horizon Season 2009, Episode 331 - Alan and Marcus Go Forth and Multiply Online Add To Playlist Watched
- Episode 324 - Why Can't We Predict Earthquakes? view all resultsWatch BBC: Horizon Season 2009, Episode 324 - Why Can't We Predict Earthquakes? Online Add To Playlist Watched
- Episode 317 - Who Do You Want Your Child to Be? view all resultsWatch BBC: Horizon Season 2009, Episode 317 - Who Do You Want Your Child to Be? Online Add To Playlist Watched
- Episode 310 - How to Survive a Disaster view all resultsWatch BBC: Horizon Season 2009, Episode 310 - How to Survive a Disaster Online Add To Playlist Watched
- Episode 303 - What's the Problem with Nudity? view all resultsWatch BBC: Horizon Season 2009, Episode 303 - What's the Problem with Nudity? Online Add To Playlist Watched
- Episode 217 - Can We Make a Star On Earth? view all resultsWatch BBC: Horizon Season 2009, Episode 217 - Can We Make a Star On Earth? Online Add To Playlist Watched
- Episode 210 - Why Do We Dream? view all resultsWatch BBC: Horizon Season 2009, Episode 210 - Why Do We Dream? Online Add To Playlist Watched
- Episode 203 - Cannabis: The Evil Weed? view all resultsWatch BBC: Horizon Season 2009, Episode 203 - Cannabis: The Evil Weed? Online Add To Playlist Watched
- Episode 126 - Why Are Thin People Not Fat? view all resultsWatch BBC: Horizon Season 2009, Episode 126 - Why Are Thin People Not Fat? Online Add To Playlist Watched
- Season 2008
- Episode 1216 - Where's My Robot view all resultsWatch BBC: Horizon Season 2008, Episode 1216 - Where's My Robot Online Add To Playlist Watched
- Episode 1209 - Allergy Planet view all resultsWatch BBC: Horizon Season 2008, Episode 1209 - Allergy Planet Online Add To Playlist Watched
- Episode 1202 - Do You Know What Time It Is? view all resultsWatch BBC: Horizon Season 2008, Episode 1202 - Do You Know What Time It Is? Online Add To Playlist Watched
- Episode 304 - Are We Alone in the Universe? view all resultsWatch BBC: Horizon Season 2008, Episode 304 - Are We Alone in the Universe? Online Add To Playlist Watched
- Episode 226 - Professor Regan's Supermarket Trolley view all resultsWatch BBC: Horizon Season 2008, Episode 226 - Professor Regan's Supermarket Trolley Online Add To Playlist Watched
- Episode 219 - How to Live to 101 view all resultsWatch BBC: Horizon Season 2008, Episode 219 - How to Live to 101 Online Add To Playlist Watched
- Episode 212 - How to Make Better Decisions view all resultsWatch BBC: Horizon Season 2008, Episode 212 - How to Make Better Decisions Online Add To Playlist Watched
- Episode 205 - Is Alcohol Worse Than Ecstasy? view all resultsWatch BBC: Horizon Season 2008, Episode 205 - Is Alcohol Worse Than Ecstasy? Online Add To Playlist Watched
- Episode 129 - What on Earth Is Wrong with Gravity? view all resultsWatch BBC: Horizon Season 2008, Episode 129 - What on Earth Is Wrong with Gravity? Online Add To Playlist Watched
- Episode 122 - Total Isolation view all resultsWatch BBC: Horizon Season 2008, Episode 122 - Total Isolation Online Add To Playlist Watched
- Episode 115 - How to Kill a Human Being view all resultsWatch BBC: Horizon Season 2008, Episode 115 - How to Kill a Human Being Online Add To Playlist Watched
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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 platfor...
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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 platfor...
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BBC: Horizon Wiki
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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.






