Horizon - Season 46 Episode 17
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.
First Air Date : 1964-02-04
Last Air date : 2024-07-22
Runtime : 57 minutes
Genre : Documentary
Cast :
Crew :
Quality : 
Subtitles :
- Season 46 : Episode 12009-01-26
- Season 46 : Episode 22009-02-03
- Season 46 : Episode 32009-02-10
- Season 46 : Episode 42009-02-17
- Season 46 : Episode 52009-02-24
- Season 46 : Episode 62009-03-03
- Season 46 : Episode 72009-03-10
- Season 46 : Episode 82009-03-17
- Season 46 : Episode 92009-03-24
- Season 46 : Episode 102009-03-31
- Season 46 : Episode 112009-05-12
- Season 46 : Episode 122009-12-22
- Season 46 : Episode 132009-12-22
- Season 46 : Episode 142009-12-22
- Season 46 : Episode 152009-12-22
- Season 46 : Episode 162009-12-22
- Season 46 : Episode 172009-12-22
- Season 46 : Episode 182009-12-09
