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Horizon · S47 E6

How Long is a Piece of String?

2009-11-17 · 60 min

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.

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Season 47 Episodes

  • E1Do I Drink Too Much?
  • E2The Secret You
  • E3Fix Me
  • E4Who's Afraid of a Big Black Hole?
  • E5Why Do We Talk?
  • E6How Long is a Piece of String?
  • E7The Secret Life of the Dog
  • E8Why Do Viruses Kill?
  • E9Pill Poppers
  • E10Don't Grow Old
  • E11To Infinity and Beyond
  • E12What Makes a Genius?
  • E13Did Cooking Make Us Human?
  • E14Is Everything We Know About the Universe Wrong?