Horizon · SEASON 47

How Long is a Piece of String?

Episode 6 · 2009-11-17

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Season 47Episode 6★ N/A/10
  • Documentary

Episode overview

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.

60 minutes

Season 47 episodes

1. Do I Drink Too Much?2009-10-13 2. The Secret You2009-10-20 3. Fix Me2009-10-27 4. Who's Afraid of a Big Black Hole?2009-11-03 5. Why Do We Talk?2009-11-10 6. How Long is a Piece of String?2009-11-17 7. The Secret Life of the Dog2010-01-06 8. Why Do Viruses Kill?2010-01-13 9. Pill Poppers2010-01-20 10. Don't Grow Old2010-02-03 11. To Infinity and Beyond2010-02-10 12. What Makes a Genius?2010-02-17 13. Did Cooking Make Us Human?2010-03-02 14. Is Everything We Know About the Universe Wrong?2010-03-09